Texas Instruments Network Router TMS380C26 User Manual

TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

• IEEE 802.5 and IBM Token-Ring Network

• Low-Cost Host-Slave I/O Interface Option

• Up to 32-Bit Host Address Bus

Compatible

• IEEE 802.3 and Blue Book Ethernet

• Selectable Host System Bus Options

Network Compatible

• 80x8x or 68xxx-Type Bus and Memory

• Pin and Software Compatible With the

Organization

TMS380C16

– 8- or 16-Bit Data Bus on 80x8x Buses

– Optional Parity Checking

• Configurable Network Type and Speed:

– Selectable by Host Software Control

(Adapter Control Register)

• Dual-Port DMA and Direct I/O Transfers to

Host Bus

– Selectable by Network Front-End

– Readable from Host (Adapter Control

• Specification for External Adapter-Bus

Devices (SEADs) Supports External

Hardware Interface for User-Defined

External Logic

• Token-Ring Features

– 16- or 4-Megabit-per-Second Data Rates

– Supports up to 18K-Byte Frame Size

(16 Mbps Operation Only)

• Enhanced Address Copy Option (EACO)

Interface Supports External Address

Checking Logic for Bridging or External

Custom Applications

– Supports Universal and Local Network

Addressing

– Early Token Release Option (16 Mbps

Operation Only)

• Support for Module High-Impedance

In-Circuit Testing

• Built-in Real-Time Error Detection

– Compatible With the TMS38054

• Bring-Up and Self-Test Diagnostics With

• Ethernet Features

Loopback

– 10-Megabit-per-Second Data Rate

– Compatible With Most Ethernet Serial

Network Interface Devices

• Automatic Frame Buffer Management

• Slow-Clock Low-Power Mode

• Single 5-V Supply

– Full Duplex Ethernet Operation Allows

Network Speed Self-test

• 1-µm CMOS Technology

• Expandable Local LAN Subsystem Memory

• 250 mA Typical Latch-Up Immunity at 25°C

• ESD Protection Exceeds 2,000 V

Space up to 2 Megabytes

• Supports Multicast Addressing of Network

Group Addresses Through Hashing

• 132-Pin JEDEC Plastic Quad Flat Package

(PQ Suffix)

• Glueless Interface to DRAMs

• Operating Temperature Range

• High-Performance 16-Bit CPU for

0°C to 70 °C

Communications Protocol Processing

• Up to 8 Megabyte-per-Second High-Speed

Bus Master DMA Interface

network commprocessor applications diagram

LAN Subsystem

Transmit

Attached

System

Bus

Token Ring or

Ethernet Physical

Layer Circuitry

Network

TMS380C26

Memory

Receive

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

description

The TMS380C26 is a single-chip network communications processor (commprocessor) that supports token

ring, or Ethernet Local Area Networks (LANs). Either token ring at data rates of 16 Mbps or 4 Mbps, or Ethernet

at a data rate of 10 Mbps, can be selected. A flexible configuration scheme allows network type and speed to

be configured by hardware or software. This allows the design of LAN subsystems which support both token

ring and Ethernet networks, by electrically or physically switched network front-end circuits.

The TMS380C26 conforms to IEEE 802.5–1989 standards and has been verified to be completely IBM

Token-Ring compatible. By integrating the essential control building blocks needed on a LAN subsystem card

into one device, the TMS380C26 can ensure that this IBM compatability is maintained in silicon.

The TMS380C26 conforms to ISO/IEC 8802–3 (ANSI/IEEE Std 802.3) CSMA/CD standards, and the Ethernet

”Blue Book” standard.

The high degree of integration of the TMS380C26 makes it a virtual LAN subsystem on a single chip. Protocol

handling, hostsysteminterfacing, memoryinterfacing, andcommunicationsprocessingareallprovidedthrough

the TMS380C26. To complete LAN subsystem design, only the network interface hardware, local memory, and

minimal additional components such as PALs and crystal oscillators need to be added.

The TMS380C26 provides a 32-bit system memory address reach with a high-speed bus-master DMA interface

that supports rapid communications with the host system. In addition, the TMS380C26 supports direct I/O and

a low-cost 8-bit pseudo-DMA interface that requires only a chip select to work directly on an 80x8x 8-bit slave

I/O interface. Finally, selectable 80x8x or 68xxx-type host system bus and memory organization add to design

flexibility.

The TMS380C26 supports addressing for up to two Megabytes of local memory. This expanded memory

capacity can improve LAN subsystem performance by minimizing the frequency of host LAN subsystem

communications by allowing larger blocks of information to be transferred at one time. The support of large local

memory is important in applications that require large data transfers (such as graphics or data base transfers)

and in heavily loaded networks where the extra memory can provide data buffers to store data until it can be

processed by the host.

The proprietary CPU used in the TMS380C26 allows protocol software to be downloaded into RAM or stored

in ROM in the local memory space. By moving protocols (such as LLC) to the LAN subsystem, overall system

performance is increased. This is accomplished due to the the offloading of processing from the host system

to the TMS380C26, which may also reduce LAN subsystem-to-host communications. As other protocol

software is developed, greater differentiation of end products with enhanced system performance will be

possible.

In addition, the TMS380C26 includes hardware counters that provide realtime error detection and automatic

frame buffer management. These counters control system bus retries, burst size, and track host and LAN

subsystem buffer status. Previously, these counters needed to be maintained in software. By integrating them

into hardware, software overhead is removed and LAN subsystem performance is improved.

The TMS380C26 implements a TI-patented Enhanced Address Copy Option (EACO) interface. This interface

supports external address checking devices, such as the TMS380SRA Source Routing Accelerator. The

TMS380C26hasa128-wordexternalI/Ospaceinitsmemorymaptosupportexternaladdress-checkerdevices

and other hardware extensions to the TMS380 architecture. Hardware designed in conformance with TI’s

Specification for External Adapter-bus Devices (SEADs) can map registers into this external I/O space and post

interrupts to the TMS380C26.

The major blocks of the TMS380C26 include the Communications Processor (CP), System Interface (SIF),

MemoryInterface(MIF), ProtocolHandler(PH), ClockGenerator(CG), andtheAdapterSupportFunction(ASF)

as shown in Figure 2.

The TMS380C26 is available in a 132-pin JEDEC plastic quad flat pack and is rated from 0°C to 70°C.

IBM is a registered trademark of International Business Machines Corporation.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

block diagram and signal descriptions

TMS380C26 has a bus interface to the host system, a bus interface to local memory, and an interface to the

physical layer circuitry. As a rule of thumb in the pin nomenclature and descriptions that follow, pin names

starting with the letter S attach to the host system bus and pin names starting with the letter M attach to the local

memory bus. Active-low signals have names with overbars, e.g., SCS.

System

Interface

(SIF)

Memory

Interface

(MIF)

SADH0

MADH0

SADH7

SADL0

MADH7

MADL0

• DIO Control

• Bus Control

• DMA Control

• DRAM Refresh

• Local Bus

Arbitrator

• Local Bus

Control

• Local

Parity Check/

Generator

SADL7

MADL7

SPH

SPL

SBRLS

MRAS

MCAS

MAXPH

MAXPL

SINTR/SIRQ

SDDIR

SDBEN

MOE

SALE

SXAL

MDDIR

MAL

SOWN

MAX0

SIACK

MAX2

SBCLK

MRESET

MROMEN

MBEN

MBRQ

MBGR

MACS

MBIAEN

MREF

SRD/SUDS

SWR/SLDS

SRDY/SDTACK

SI/M

SHLDA/SBGR

SBHE/SRNW

SRAS/SAS

S8/SHALT

SRESET

SRS0

OSCIN

OSCOUT

MBCLK1

MBCLK2

SYNCIN

CLKDIV

Clock

Generator

(CG)

SRS1

SRS2/SBERR

SCS

SRSX

SHRQ/SBRQ

SBBSY

BTSTRP

PRTYEN

NSELOUT0

NSELOUT1

NMI

EXTINT0

Adapter

Support

Function

(ASF)

EXTINT3

TEST0

• Interrupts

• Test Function

Communications

Processor

TEST5

XMATCH

XFAIL

RCLK/RXC

REDY/CRS

WFLT/COLL

RCVR/RXD

FRAQ/TXD

NSRT/LPBK

WRAP/TXEN

DRVR

Protocol Handler (PH):

for Token Ring and

Ethernet Interface

PXTALIN/TXC

DRVR

Figure 2. TMS380C26 COMMprocessor Block Diagram

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TMS380C26

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SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions

PIN NAME

NO.

I/O

DESCRIPTION

Bootstrap. The value on this pin is loaded into the BOOT bit of the SIFACL register at reset (i.e., when

the SRESET pin is asserted or the ARESET bit in the SIFACL register is set) to form a default value.

This bit indicates whether chapters 0 and 31 of the memory map are RAM or ROM. If these chapters

are RAM then the TMS380C26 is denied access to the local memory bus until the CPHALT bit in the

SIFACL register is cleared.

BTSTRP

H = Chapters 0 and 31 of local memory are RAM-based (see Note 1).

Chapters 0 and 31 of local memory are ROM-based.

Clock Divider Select. This pin must be pulled high

CLKDIV

H = Indicates 64-MHz OSCIN (see Note 3).

Reserved.

EXTINT0

EXTINT1

EXTINT2

EXTINT3

Reserved; must be pulled high (see Note 4).

MACS

104

Reserved. Must be tied low (see Note 2).

MADH0

MADH1

MADH2

MADH3

MADH4

MADH5

MADH6

MADH7

129

128

127

126

123

122

121

120

Local memory Address, Data and Status Bus – high byte. For the first quarter of the local memory

cycle these bus lines carry address bits AX4 and A0 to A6; for the second quarter, they carry status

bits; and for the third and fourth quarters, they carry data bits 0 to 7. The most significant bit is MADH0

and the least significant bit is MADH7.

I/O

Memory Cycle

Signal

AX4,A0–A6

Status

D0–D7

MADL0

MADL1

MADL2

MADL3

MADL4

MADL5

MADL6

MADL7

Local Memory Address, Data and Status Bus – low byte. For the first quarter of the local memory

cycle, these bus lines carry address bits A7 to A14; for the second quarter, they carry address bits

AX4 and A0 to A6; and for the third and fourth quarters, they carry data bits 8 to 15. The most

significant bit is MADL0 and the least significant bit is MADL7.

I/O

Memory Cycle

Signal

A7–A14

AX4,A0–A6

D8–D15

Memory Address Latch. This is a strobe signal for sampling the address at the start of the memory

cycle; it is used by SRAMs and EPROMs. The full 20-bit word address is valid on MAX0, MAXPH,

MAX2,MAXPL,MADH0-MADH7,andMADL0-MADL7.Three8-bittransparentlatchescantherefore

be used to retain a 20-bit static address throughout the cycle.

MAL

103

OUT

Rising edge

Falling edge

No signal latching.

Allows the above address signals to be latched.

Local Memory Extended Address Bit. This signal drives AX0 at ROW address time and it drives A12

at COL address and DATA time for all cycles. This signal can be latched by MRAS. Driving A12 eases

interfacing to a BIA ROM.

MAX0

MAX2

111

112

OUT

Memory Cycle

Signal

AX0

A12

Local Memory Extended Address Bit. This signal drives AX2 at ROW address time, which can be

latched by MRAS, and A14 at COL address, and DATA time for all cycles. Driving A14 eases

interfacing to a BIA ROM.

Memory Cycle

Signal

AX2

A14

NOTES: 1. Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

2. Pin should be connected to ground.

3. Pin should be tied to V

4. Each pin must be individually tied to V

with a 4.7-kΩ pullup resistor.

with a 1.0-kΩ pullup resistor.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

PIN NAME

NO.

I/O

DESCRIPTION

Local Memory Extended Address and Parity High Byte. For the first quarter of a memory cycle this

signal carries the extended address bit (AX1); for the second quarter of a memory cycle this signal

carries the extended address bit (AX0); and for the last half of the memory cyle this signal carries the

parity bit for the high data byte.

MAXPH

130

I/O

Memory Cycle

Signal

AX1

AX0

Parity

Local Memory Extended Address and Parity Low Byte. For the first quarter of a memory cycle this

signal carries the extended address bit (AX3), for the second quarter of a memory cycle this signal

carries extended address bit (AX2); and for the last half of the memory cycle this signal carries the

parity bit for the low data byte.

MAXPL

I/O

Memory Cycle

Signal

AX3

AX2

Parity

Local Bus Clock1 and local Bus Clock 2. These signals are referenced for all local bus transfers.

MBCLK2 lags MBCLK1 by a quarter of a cycle. These clocks operate at 8 MHz for a 64-MHz OSCIN

and 6 MHz for a 48-MHz OSCIN, which is twice the memory cycle rate. The MBCLK signals are

always a divide-by-8 of the OSCIN frequency.

MBCLK1

MBCLK2

OUT

Buffer Enable. This signal enables the bidirectional buffer outputs on the MADH, MAXPH, MAXPL,

and MADL buses during the data phase. This signal is used in conjunction with MDDIR which selects

the buffer output direction.

MBEN

119

132

101

131

OUT

H = Buffer output disabled.

Buffer output enabled.

MBGR

MBIAEN

MBRQ

Reserved. Must be left unconnected.

Burned-In Address Enable. This is an output signal used to provide an output enable for the ROM

containing the adapter’s Burned-In Address (BIA).

H = This signal is driven high for any WRITE accesses to the addresses between >00.0000 and

>00.000F, or any accesses (Read/Write) to any other address.

This signal is driven low for any READ from addresses between >00.0000 and >00.000F.

Reserved. Must be pulled high (see Note 4).

Column Address Strobe for DRAMs. The column address is valid for the 3/16 of the memory cycle

following the row address portion of the cycle. This signal is driven low every memory cycle while the

column address is valid on MADL0-MADL7, MAXPH, and MAXPL, except when one of the following

conditions occurs:

1) When the address accessed is in the BIA ROM (>00.0000 – >00.000F).

2) When the address accessed is in the EPROM memory map (i.e., when the BOOT bit in

the SIFACL register is zero and an access is made between >00.0010 – >00.FFFF)

or >1F.0000 – >1F.FFFF).

MCAS

113

OUT

3) When the cycle is a refresh cycle, in which case MCAS is driven at the start of the cycle before

MRAS (for DRAMs that have CAS-before-RASrefresh). For DRAMs that do not support CAS-

before-RAS refresh, it may be necessary to disable MCAS with MREF during the refresh

cycle.

Data Direction. This signal is used as a direction control for bidirectional bus drivers. The signal

becomes valid before MBEN active.

MDDIR

110

OUT

H = TMS380C26 memory bus write.

TMS380C26 memory bus read.

NOTE 4: Each pin must be individually tied to V

with a 1.0-kΩ pullup resistor.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

PIN NAME

NO.

I/O

DESCRIPTION

Memory Output Enable. This signal is used to enable the outputs of the DRAM memory during a read

cycle. This signal is high for EPROM or BIA ROM read cycles.

MOE

118

OUT

H = Disable DRAM outputs.

Enable DRAM outputs.

Row Address Strobe for DRAMs. The row address lasts for the first 5/16 of the memory cycle. This

signal is driven low every memory cycle while the row address is valid on MADL0-MADL7, MAXPH,

andMAXPLforbothRAMandROMcycles.Itisalsodrivenlowduringrefreshcycleswhentherefresh

address is valid on MADL0-MADL7.

MRAS

MREF

115

102

OUT

DRAM Refresh Cycle in Progress. This signal is used to indicate that a DRAM refresh cycle is

occurring. It is also used for disabling MCAS to all DRAMs that do not use a CAS before-RAS refresh.

H = DRAM refresh cycle in process.

Not a DRAM refresh cycle.

Memory Bus Reset. This is a reset signal generated when either the ARESET bit in the SIFACL

logic.

MRESET

MROMEN

OUT

H = External logic not reset.

External logic reset.

ROM Enable. During the first 5/16 of the memory cycle, this signal is used to provide a chip select

for ROMs when the BOOT bit of the SIFACL register is zero (i.e., when code is resident in ROM, not

RAM). It can be latched by MAL. It goes low for any read from addresses >00.0010 – >00.FFFF or

>1F.0000 – >1F.FFFF when the Boot bit in the SIFACL register is zero. It stays high for writes to these

addresses, accesses of other addresses, or accesses of any address when the BOOT bit is one.

During the final three quarters of the memory cycle, it outputs the A13 address signal for interfacing

to a BIA ROM. This means MBIAEN, MAX0, ROMEN, and MAX2 together form a glueless interface

for the BIA ROM.

105

H = ROM disabled.

ROM enabled.

Local Memory Write. This signal is used to specify a write cycle on the local memory bus. The data

on the MADH0-MADH7 and MADL0-MADL7 buses is valid while MW is low. DRAMs latch data on

the falling edge MW, while SRAMs latch data on the rising edge of MW.

114

H = Not a local memory write cycle.

Local memory write cycle.

NMI

Non-Maskable Interrupt Request. This pin must be left unconnected.

External Oscillator Input. This line provides the clock frequency to the TMS380C26 for a 4-MHz

internal bus. OSCIN should be 64 a MHz signal (see Note 5).

OSCIN

107

Oscillator Output. With OSCIN at 64 MHz and CLKDIV pulled high, this pin provides an 8 MHz output

which can be used by TMS3054 for 4 Mbps operation without the need for an additional crystal.

OSCOUT

OUT

CLKDIV

OSCOUT

Reserved

OSCIN/8

(Reserved)

(if OSCIN = 64 MHz, then OSCOUT = 8 MHz).

NOTE 5: Pin has an expanded input voltage specification.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

PIN NAME

NO.

I/O

DESCRIPTION

Parity Enable. The value on this pin is loaded into the PEN bit of the SIFACL register at reset (i.e.,

when the SRESET pin is asserted or the ARESET bit in the SIFACL register is set) to form a default

value. This bit enables parity checking for the local memory.

PRTYEN

H = Local memory data bus checked for parity (see Note 1).

Local memory data bus NOT checked for parity.

Network Selection Outputs. These output signals are controlled by the host through the

correspondingbitsoftheSIFACTLregister. Thevalueofthesebits/signalscanonlybechangedwhile

the TMS380C26 is reset.

NSELOUT0

NSELOUT1

OUT

NSELOUT0

NSELOUT1

Description

Reserved

16 Mbps token ring

Ethernet (802.3/Blue Book)

4 Mbps token ring

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Intel Mode (SI/M = H)

PIN NAME

SADH0

NO.

I/O

DESCRIPTION

SADH1

SADH2

SADH3

SADH4

SADH5

SADH6

SADH7

System Address/Data Bus—high byte (see Note 1).These lines make up the most significant byte

of each address word (32-bit address bus) and data word (16-bit data bus). The most significant bit

is SADH0, and the least significant bit is SADH7.

I/O

†

Address Multiplexing : Bits 31 – 24 and bits 15 – 8.

†

Data Multiplexing : Bits 15 – 8.

SADL0

SADL1

SADL2

SADL3

SADL4

SADL5

SADL6

SADL7

System Address/Data Bus—low byte (see Note 1). These lines make up the least significant byte of

each address word (32-bit address bus) and data word (16-bit data bus). The most significant bit is

SADL0, and the least significant bit is SADL7.

I/O

†

Address Multiplexing : Bits 23 – 16 and bits 7 – 0.

†

Data Multiplexing : Bits 7 – 0.

System Address Latch Enable. This is the enable pulse used to externally latch the 16 LSBs of the

address from the SADH0 – SADH7 and SADL0 – SADL7 buses at the start of the DMA cycle.

Systems that implement address parity can also externally latch the parity bits (SPH and SPL) for

the latched address.

SALE

OUT

System Bus Busy. The TMS380C26 samples the value on this pin during arbitration. The sample has

one of (2) two values (see Note 1):

SBBSY

H = Not busy. The TMS380C26 may become Bus Master if the grant condition is met.

Busy. The TMS380C26 cannot become Bus Master.

System Bus Clock. The TMS380C26 requires the external clock to synchronize its bus timings for

all DMA transfers.

SBCLK

System Byte High Enable. This pin is a three-state output that is driven during DMA and an input at

all other times.

SBHE/SRNW

I/O

H = System Byte High not enabled (see Note 1).

System Byte High enabled.

System Bus Release. This pin indicates to the TMS380C26 that a higher-priority device requires the

system bus. The value on this pin is ignored when the TMS380C26 is NOT perfoming DMA. This

signal is internally synchronized to SBCLK.

SBRLS

H = The TMS380C26 can hold onto the system bus (see Note 1).

The TMS380C26 should release the system bus upon completion of current DMA cycle. If the

DMA transfer is not yet complete, the SIF will rearbitrate for the system bus.

System Chip Select. Activates the system interface of the TMS380C26 for a DIO read or write.

SCS

H = Not selected (see Note 1).

Selected.

System Data Bus Enable. This output signals to the external data buffers to begin driving data. This

output is activated during both DIO and DMA.

SDBEN

OUT

H = Keep external data buffers in high-impedance state.

Cause external data buffers to begin driving data.

†

Typical bit ordering for Intel and Motorola processor buses.

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Intel Mode (SI/M = H)

PIN NAME

NO.

I/O

DESCRIPTION

SystemDataDirection. Thisoutputprovidestotheexternaldatabuffersasignalindicatingthedirection

in which the data is moving. During DIO writes and DMA reads, SDDIR is low (data direction input to

the TMS380C26). During DIO reads and DMA writes, SDDIR is high (data direction output from the

TMS380C26). When the system interface is NOT involved in a DIO or DMA operation, then SDDIR is

high by default.

SDDIR

OUT

DATA

SDDIR

DIRECTION

output

DIO

read

write

DMA

write

read

input

System Hold Acknowledge. This pin indicates that the system DMA hold request has been

acknowledged. It is internally synchronized to SBCLK (see Note 1).

H = Hold request acknowledged.

SHLDA/SBGR

Hold request not acknowledged.

System Hold Request. This pin is used to request control of the system bus in preparation for a DMA

transfer. This pin is internally synchronized to SBCLK.

SHRQ/SBRQ

OUT

H = System bus requested.

System bus not requested.

System Interrupt Acknowledge. This signal is from the host processor to acknowledge the interrupt

request from the TMS380C26.

SIACK

H = System interrupt not acknowledged (see Note 1).

System interrupt acknowledged: the TMS380C26 places its interrupt vector onto the system

bus.

System Intel/Motorola Mode Select. The value on this pin specifies the system interface mode.

H = Intel-compatible interface mode selected. Intel interface can be 8-bit or 16-bit mode

(see S8/SHALT pin description and Note 1.)

SI/M

Motorola-compatible interface mode selected.

System Interrupt Request. TMS380C26 activates this output to signal an interrupt request to the host

processor.

SINTR/SIRQ

OUT

H = Interrupt request by TMS380C26.

No interrupt request.

System Bus Owned. This signal indicates to external devices that TMS380C26 has control of the

system bus. This signal drives the enable signal of the bus transceiver chips, which drive the address

and bus control signals.

SOWN

OUT

H = TMS380C26 does not have control of the system bus.

TMS380C26 has control of the system bus.

System Parity High. The optional odd-parity bit for each address or data byte transmitted over

SADH0-SADH7 (see Note 1).

SPH

SPL

I/O

System Parity Low. The optional odd-parity bit for each address or data byte transmitted over

SADL0-SADL7 (see Note 1).

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Intel Mode (SI/M = H)

PIN NAME

NO.

I/O

DESCRIPTION

SystemMemoryAddressStrobe(seeNote3). ThispinusedtolatchtheSCS, SRSX – SRS2register

input signals. In a minimum-chip system, SRAS is tied to the SALE output of the System Bus. The

latching capability can be defeated since the internal latch for these inputs remains transparent as

long as SRAS remains high. This permits SRAS to be pulled high and the signals at the SCS,

SRSX – SRS2, and SBHE to be applied independently of the SALE strobe from the system bus.

During DMA this pin remains an input.

SRAS/SAS

I/O

High

Low

= transparent mode

= Holds latched values of SCS, SRSX–SRS2, and SBHE

Falling edge = latches SCS, SRSX – SRS2, and SBHE

System Read Strobe (see Note 3). Active-low strobe indicating that a read cycle is performed on the

system bus. This pin is an input during DIO and an output during DMA.

SRD/SUDS

I/O

H = Read cyle is not occurring.

If DMA: host provides data to system bus.

If DIO: SIF provides data to system bus.

System Bus Ready (see Note 3).The purpose of this signal is to indicate to the bus master that a data

transfer is complete. This signal is asynchonous, but during DMA and pseudo-DMA cycles it is

internally synchronized to SBCLK. During DMA cycles, it must be asserted before the falling edge

of SBCLK in state T2 in order to prevent a wait state. This signal is an output when the TMS380C26

is selected for DIO, and an input otherwise.

SRDY/SDTACK

H = System bus NOT ready.

Data transfer is complete; system bus is ready.

System Reset. This input signal is activated to place the TMS380C26 into a known initial state.

Hardware reset will put most of the TMS380C26 output pins into a high-impedance state and place

all blocks into the reset state. DMA bus width selection is latched on the rising edge of SRESET.

SRESET

No system reset.

System reset.

Rising edge = Latch bus width for DMA operation.

System Register Select. These inputs select the word or byte to be transferred during a system DIO

access. The most significant bit is SRSX and the least significant bit is SRS2 (see Note 1).

SRSX

SRS0

SRS1

SRS2/SBERR

MSb

LSb

Registered selected

SRSX

SRS0

SRS1

SRS2/SBERR

System Write Strobe (see Note 3). This pin serves as an active-low write strobe. This pin is an input

during DIO and an output during DMA.

SWR/SLDS

I/O

H = Write cycle is not occurring.

If DMA: data to be drivien from SIF to host bus.

If DIO: on the rising edge, the data is latched and written to the selected register.

System Extended Address Latch. This output provides the enable pulse used to externally latch the

most significant 16 bits of the 32-bit system address during DMA. SXAL is activated prior to the first

cycle of each block DMA transfer, and thereafter as necessary (whenever an increment of the DMA

addresscountercausesacarry-outofthelower16bits). Systemsthatimplementparityonaddresses

can use SXAL to externally latch the parity bits (available on SPL and SPH) for the DMA address

extension.

SXAL

OUT

NOTES: 1. Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

3. Pin should be tied to V with a 4.7-kΩ pullup resistor.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Intel Mode (SI/M = H)

PIN NAME

SYNCIN

NO.

I/O

DESCRIPTION

108

Reserved. This signal must be left unconnected (see Note 1).

System 8/16-bit bus select. This pin selects the bus width used for communications through the

system interface. On the rising edge of SRESET, the TMS380C26 latches the DMA bus width;

otherwise the value on this pin dynamically selects the DIO bus width.

S8/SHALT

H = Selects 8-bit mode (see Note 1).

Selects 16-bit mode.

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Motorola Mode (SI/M = L)

PIN NAME

SADH0

NO.

I/O

DESCRIPTION

SADH1

SADH2

SADH3

SADH4

SADH5

SADH6

SADH7

System Address/Data Bus—high byte (see Note 1).These lines make up the most significant byte

of each address word (32-bit address bus) and data word (16-bit data bus). The most significant bit

is SADH0, and the least significant bit is SADH7.

I/O

†

Address Multiplexing : Bits 31 – 24 and bits 15 – 8.

†

Data Multiplexing : Bits 15 – 8.

SADL0

SADL1

SADL2

SADL3

SADL4

SADL5

SADL6

SADL7

System Address/Data Bus—low byte (see Note 1). These lines make up the least significant byte of

each address word (32-bit address bus) and data word (16-bit data bus). The most significant bit is

SADL0, and the least significant bit is SADL7.

I/O

†

Address Multiplexing : Bits 23 – 16 and bits 7 – 0.

†

Data Multiplexing : Bits 7 – 0.

System Address Latch Enable. This is the enable pulse used to externally latch the 16 LSBs of the

address from the SADH0 – SADH7 and SADL0 – SADL7 buses at the start of the DMA cycle.

Systems that implement address parity can also externally latch the parity bits (SPH and SPL) for

the latched address.

SALE

OUT

System Bus Busy. The TMS380C26 samples the value on this pin during arbitration. The sample has

one of (2) two values (see Note 1):

SBBSY

H = Not busy. The TMS380C26 may become Bus Master if the grant condition is met.

Busy. The TMS380C26 cannot become Bus Master.

System Bus Clock. The TMS380C26 requires the external clock to synchronize its bus timings for

all DMA transfers.

SBCLK

System Read Not Write. This pin serves as a control signal to indicate a read or write cycle.

SBHE/SRNW

I/O

H = Read Cycle (see Note 1).

Write Cycle

System Bus Release. This pin indicates to the TMS380C26 that a higher-priority device requires the

system bus. The value on this pin is ignored when the TMS380C26 is NOT perfoming DMA. This

signal is internally synchronized to SBCLK.

SBRLS

H = The TMS380C26 can hold onto the system bus (see Note 1).

The TMS380C26 should release the system bus upon completion of current DMA cycle. If the

DMA transfer is not yet complete, the SIF will rearbitrate for the system bus.

System Chip Select. Activates the system interface of TMS380C26 for a DIO read or write.

SCS

H = Not selected (see Note 1).

Selected.

System Data Bus Enable. This output signals to the external data buffers to begin driving data. This

output is activated during both DIO and DMA.

SDBEN

OUT

H = Keep external data buffers in high-impedance state.

Cause external data buffers to begin driving data.

†

Typical bit ordering for Intel and Motorola processor buses.

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Motorola Mode (SI/M = L)

PIN NAME

NO.

I/O

DESCRIPTION

System Data Direction. This output provides to the external data buffers a signal indicating the

directionin which the data is moving. During DIO writes and DMA reads, SDDIR is low (data direction

input to the TMS380C26). During DIO reads and DMA writes, SDDIR is high (data direction output

from the TMS380C26). When the system interface is NOT involved in a DIO or DMA operation, then

SDDIR is high by default.

SDDIR

OUT

DATA

SDDIR

DIRECTION

output

DIO

read

write

DMA

write

read

input

System Bus Grant. This pin serves as an active-low bus grant, as defined in the standard 68000

interface, and is internally synchronized to SBCLK (see Note 1).

SHLDA/SBGR

H = System bus not granted,

System bus granted.

System Bus Request. This pin is used to request control of the system bus in preparation for a DMA

transfer. This pin is internally synchronized to SBCLK.

SHRQ/SBRQ

OUT

H = System bus not requested.

System bus requested.

System Interrupt Acknowledge. This signal is from the host processor to acknowledge the interrupt

request from the TMS380C26.

SIACK

H = System interrupt not acknowledged (see Note 1).

System interrupt acknowledged: the TMS380C26 places its interrupt vector onto the system

bus.

System Intel/Motorola Mode Select. The value on this pin specifies the system interface mode.

SI/M

H = Intel-compatible interface mode selected.

Motorola-compatible interface mode selected. Motorola interface mode is always 16 bits.

System Interrupt Request. TMS380C26 activates this output to signal an interrupt request to the host

processor.

SINTR/SIRQ

OUT

H = No interrupt request.

Interrupt request by TMS380C26.

System Bus Owned. This signal indicates to external devices that TMS380C26 has control of the

system bus. This signal drives the enable signal of the bus transceiver chips, which drive the address

and bus control signals.

SOWN

OUT

H = TMS380C26 does not have control of the system bus.

TMS380C26 has control of the system bus.

System Parity High. The optional odd-parity bit for each address or data byte transmitted over

SADH0-SADH7 (see Note 1).

SPH

SPL

I/O

System Parity Low. The optional odd-parity bit for each address or data byte transmitted over

SADL0-SADL7 (see Note 1).

Sytem Memory Address Strobe (see Note 3). This pin is an active-low address strobe that is an input

during DIO (although ignored as an address strobe) and an output during DMA.

SRAS/SAS

I/O

H = Address not valid

Address is valid and a transfer operation is in progress.

NOTES: 1. Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

3. Pin should be tied to V with a 4.7-kΩ pullup resistor.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

System Interface – Motorola Mode (SI/M = L)

PIN NAME

NO.

I/O

DESCRIPTION

Upper Data Strobe (see Note 3). This pin serves as the active-low upper data strobe.

This pin is an input during DIO and an output during DMA.

SRD/SUDS

I/O

H = Not valid data on SADH0-SADH7 lines.

Valid data on SADH0-SADH7 lines.

System Data Transfer Acknowledge (see Note 3). The purpopse of this signal is to indicate to the bus

master that a data transfer is complete. This signal is internally synchronized to SBCLK. During DMA

cycles, itmustbeassertedbeforethefallingedgeofSBCLKinstateT2inordertopreventawaitstate.

This signal is an output when the TMS380C26 is selected for DIO, and an input otherwise.

SRDY/SDTACK

I/O

H = System bus NOT ready.

Data transfer is complete; system bus is ready.

System Reset. This input is activated to place the adapter into a known initial state. Hardware reset

will put most of the TMS380C26 output pins into a high-impedance state and place all blocks into the

reset state.

SRESET

H = No system reset.

System reset.

System Register Select. These inputs select the word or byte to be transferred during a system DIO

access. The most significant bit is SRSX and the least significant bit is SRS1 (see Note 1).

SRSX

SRS0

SRS1

MSb

LSb

SRSX

SRS0

SRS1

Bus Error. Corresponds to the bus error signal of the 68000 microprocessor. It is internally

synchronized to SBCLK. This input is driven low during a DMA cycle to indicate to the TMS380C26

that the cycle must be terminated. See Section 3.4.5.3 of the TMS380 Second-Generation Token

Ring User’s Guide (SPWU005) for more information (see Note 1).

SRS2/SBERR

Lower Data Strobe (see Note 3). This pin is an input during DIO and an output during DMA. This pin

serves as the active-low lower data strobe.

SWR/SLDS

I/O

H = Not valid data on SADL0-SADL7 lines.

Valid data on SADL0-SADL7 lines.

System Extended Address Latch. This output provides the enable pulse used to externally latch the

most significant 16 bits of the 32-bit system address during DMA. SXAL is activated prior to the first

cycle of each block DMA transfer, and thereafter as necessary (whenever an increment of the DMA

address counter causes a carry-out of the lower 16-bits). Systems that implement parity on

addresses can use SXAL to externally latch the parity bits (available on SPL and SPH) for the DMA

address extension.

SXAL

OUT

SYNCIN

108

Reserved. This signal must be left unconnected (see Note 1).

System Halt/Bus Error Retry. If this signal is asserted along with bus errror (SBERR), the adapter will

retry the last DMA cycle. This is the re-run operation as defined in the 68000 specification. The

BERETRY counter is not decremented by SBERR when SHALT is asserted. See Section 3.4.5.3 of

the TMS380 Second-Generation Token Ring User’s Guide (SPWU005) for more information.

S8/SHALT

NOTES: 1. Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

3. Pin should be tied to V with a 4.7-kΩ pullup resistor.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

Network Media Interface – Token-Ring Mode (TEST1 = H, TEST2 = H)

PIN NAME

DRVR

NO.

I/O

DESCRIPTION

Differential Driver Data Output. These pins are the differential outputs that send the TMS380C16

transmit data to the TMS38054 for driving onto the ring transmit signal pair.

OUT

DRVR

FrequencyAcquisitionControl. ThisTTLoutputdeterminestheuseoffrequencyorphaseacquisition

mode in the TMS38054.

FRAQ/TXD

OUT

H = Wide range. Frequency centering to PXTALIN by TMS38054.

Narrow range. Phase-lock onto the incoming data (RCVINA and RCVINB) by the

TMS38054.

Insert Control Signal to the TMS38054. This TTL output signal enables the phantom driver outputs

(PHOUTA and PHOUTB) of the TMS38054, through the watchdog timer, for insertion onto the

Token-Ring.

NSRT/LPBK

OUT

Static High

Static Low

NSRT Low and Pulsed High

Inactive, phantom current removed (due to watchdog timer)

Active, current output on PHOUTA and PHOUTB

Ring Interface Clock Frequency Control (see Note 5). At 16-Mbps ring speed, this input must be

supplied a 32-MHz signal. At 4-Mbps ring speed, the input signal must be 8-MHz and may be the

output from the OSCOUT pin.

PXTALIN/TXC

Ring Interface Recovered Clock (see Note 5). This input signal is the clock recovered by the

TMS38054 from the Token-Ring received data.

RCLK/RXC

RCVR/RXD

REDY/CRS

For 16-Mbps operation it is a 32-MHz clock.

For 4-Mbps operation it is an 8-MHz clock.

Ring Interface Received Data (see Note 5). This input signal contains the data received by the

TMS38054 from the token ring.

Ring Interface Ready. This input pin provides an indication of the presence of received data, as

monitored by the TMS38054 energy detect capacitor.

H = Not ready. Ignore received data.

Ready. Received data.

Wire Fault Detect. This signal is an input to the TMS380C16 driven by the TMS38054. It indicates

a current imbalance of the TMS38054 PHOUTA and PHOUTB pins.

WFLT/COLL

H = No wire fault detected.

Wire fault detected.

Internal Wrap Select. This signal is an output from the TMS380C16 to the ring interface to activate

an internal attenuated feedback path from the transmitted data (DRVR) to receive data (RCVR)

signals for bring-up diagnostic testing. When active, the TMS38054 also cuts off the current drive to

the transmission pair.

WRAP/TXEN

OUT

H = Normal ring operation.

Transmit data drives receive data (loopback).

NOTE 5: Pin has an expanded input voltage specification.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

Network Media Interface – Ethernet Mode (TEST1 = L, TEST2 = H)

PIN NAME

DRVR

NO.

I/O

DESCRIPTION

ThesepinshavenoEthernetfunction. InEthernetModethesepinsareplacedintheirtokenringreset

state of DRVR = High, DRVR = Low.

OUT

DRVR

Ethernet Transmit Data. This output signal provides the Ethernet physical layer circuitry with bit-rate

from the TMS380C26. Data on this pin is output synchronously to the transmit clock TXC. It is

normally connected to the TXD pin of an Ethernet Serial Network Interface (SNI) chip.

FRAQ/TXD

OUT

Loopback. This enables loopback of Ethernet transmit data through the Ethernet (SNI) device to

recieve data.

NSRT/LPBK

H = Wrap through the front end device

Normal operation

Ethernet Transmit Clock. A 10 MHz clock input used to synchronize transmit data from the

TMS380C26totheEthernetphysicallayercircuitry. Thisisacontinuouslyrunningclock. Itisnormally

connected to the TXC output pin of an Ethernet SNI chip (see Note 5).

PXTALIN/TXC

Ethernet Receive Clock. A 10 MHz clock input used to synchronize received data from the Ethernet

physical layer circuitry to the TMS380C26. This clock must be present whenever the CRS signal is

active (although it can be held low for a maximum of 16 clock cycles after the rising edge of CRS).

When the CRS signal is inactive it is permissable to hold this clock in a low phase. It is normally

connectedtotheRXCoutputpinofanEthernetSerialNetworkInterface(SNI)chip. TheTMS380C26

requires this pin to be maintained in the low state when CRS is not asserted (see Note 5).

RCLK/RXC

RCVR/RXD

REDY/CRS

Ethernet Received Data. This input signal provides the TMS380C26 with bit rate network data from

the Ethernet front end device. Data on this pin must be synchronous with the receive clock RXC. It

is normally connected to the RXD pin of an Ethernet SNI chip (see Note 5).

EthernetCarrierSense.ThisinputsignalindicatestotheTMS380C26thattheEthernetphysicallayer

circuitry has network data present on the RXD pin. This signal is asserted high when the first bit of

the frame is received and is deasserted after the last bit of the frame is received.

H = Receiving data.

No data on network.

Ethernet Collision Detect. This input signal indicates to the TMS380C26 that the Ethernet physical

layer circuitry has detected a network collision. This signal must be present for at least two TXC clock

cycles to ensure it is accepted by the TMS380C26. It is normally connected to the COLL pin of an

Ethernet SNI chip. This signal can also be an indication of the SQE test signal.

WFLT/COLL

H = COLL detected by the SNI device.

Normal operation.

Ethernet Transmit Enable. This output signal indicates to the Ethernet physical layer circuitry that

bit-rate data is present on the TXD pin. This signal is output synchronously to the transmit clock TXC.

It is normally connected to the TXE pin of an Ethernet SNI chip.

WRAP/TXEN

OUT

H = Data line currently contains data to be transmitted.

No valid data on TXEN.

NOTE 5: Pin has an expanded input voltage specification.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

PIN NAME

NO.

I/O

DESCRIPTION

Network Select inputs. These pins are used to select the network speed and type to be used by the

TMS380C26. These inputs should only be changed during adapter reset.

TEST0 TEST1 TEST2 Description

TEST 0

TEST 1

TEST 2

Reserved

16 Mbps token ring

Ethernet (802.3/Blue Book)

4 Mbps token ring

Reserved

Test Pin Inputs. These pins should be left unconnected (see Note 1).

TEST3

TEST4

TEST5

Module-in-Place test mode is achieved by tying TEST 3 and TEST 4 pins to ground. In this mode,

all TMS380C26 output pins are high impedance. Internal pullups on all TMS380C26 inputs will be

disabled (except TEST3-TEST5 pins).

External Fail-to-Match signal. An enhanced address copy option (EACO) device uses this signal to

indicate to the TMS380C26 that it should not copy the frame nor set the ARI/FCI in bits in a token

ring frame due to an external address match.The ARI/FCI bits in a token ring frame may be set due

to an internal address matched frame. If an enhanced address copy option (EACO) device is NOT

used, then this pin must be left unconnected. This pin is ignored when CAF mode is enabled.

See table given below in XMATCH pin description (see Note 1).

XFAIL

H = No address match by external address checker.

External address checker armed state.

External Match signal. An enhanced address copy option (EACO) device uses this signal to indicate

to the TMS380C26 to copy the frame and set the ARI/FCI bits in a token ring frame. If an enhanced

address copy option (EACO) device is NOT used, then this pin must be left unconnected. This pin

is ignored when CAF mode is enabled (see Note 1).

H = Address match recognized by external address checker.

External address checker armed state.

XMATCH

XFAIL

Function

Armed (Processing frame data).

Do NOT externally match the frame. (XFAIL takes precedence)

COPY the frame.

HI-Z

Do NOT externally match the frame. (XFAIL takes precedence)

Reset state (adapter not initialized).

100

Positive supply voltage for digital logic. All V

supply plane.

pins must be attached to the common system power

DDL

DD1

DD2

DD3

DD4

DD5

DD6

109

124

Positive supply voltage for output buffers. All V

power supply plane.

pins must be attached to the common system

116

Ground reference for output buffers (clean ground). All V

system ground plane.

pins must be attached to the common

SSC

117

Ground reference for input buffers. All V pins must be attached to the common system ground

SSI

plane.

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

Terminal Functions (continued)

PIN NAME

NO.

I/O

DESCRIPTION

SSL

Groundreferencefordigitallogic.AllV pinsmustbeattachedtothecommonsystemgroundplane.

SS1

SS2

SS3

SS4

SS5

SS6

106

125

Ground connections for output buffers. All V

pins must be attached to system ground plane.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

architecture

The major blocks of the TMS380C26 include the Communications Processor (CP), System Interface (SIF),

Memory Interface (MIF), Protocol Handler (PH), Clock Generator (CG), and the Adapter Support Function

(ASF). The functionality of each block is described in the following sections.

communications processor (CP)

The Communications Processor (CP) performs the control and monitoring of the other functional blocks in the

TMS380C26. The control and monitoring protocols are specified by the software (downloaded or ROM-based)

in local memory. Available protocols include:

•

Media Access Control (MAC) software,

Logical Link Control (LLC) software, (token ring version only), and

Copy All Frames (CAF) software.

The CP is a proprietary 16-bit central processing unit (CPU) with data cache and a single prefetch pipe for

pipelining of instructions. These features enhance the TMS380C26’s maximum performance capability to about

4 million instructions per second (MIPS), with an average of about 2.5 MIPS.

system interface (SIF)

The System Interface (SIF) performs the interfacing of the LAN subsystem to the host system. This interface

may require additional logic depending on the application. The system interface can transfer information/data

using any of these three methods:

•

Direct Memory Access (DMA),

Direct Input/Output (DIO), or

Pseudo-Direct Memory Access (PDMA).

DMA (or PDMA) is used to transfer all data to/from host memory from/to local memory. DIO’s main uses are for

loading the software to local memory and for initializing the TMS380C26. DIO also allows command/status

interrupts to occur to and from the TMS380C26.

The system interface can be hardware selected for either of two modes by use of the SI/M pin. The mode

selected determines the memory organizations and control signals used. These modes are:

•

The Intel 80x8x families: 8-, 16-, and 32-bit bus members

The Motorola 68000 microprocessor family: 16- and 32-bit bus members

The system interface supports host system memory addressing up to 32 bits (32-bit reach into the host system

memory). This allows greater flexibility in using/accessing host system memory.

System designers are allowed to customize the system interface to their particular bus by:

•

Programmable burst transfers or cycle-steal DMA operations

Optional parity protection

These features are implemented in hardware to reduce system overhead, facilitate automatic rearbitration of

the bus after a burst, or repeat a cycle when errors occur (parity or bus). Bus retries are also supported.

The system interface hardware also includes features to enhance the integrity of the TMS380C26 and the data.

These features do the following:

•

Always internally maintain odd byte parity regardless if parity is disabled,

Monitor for the presence of a clock failure.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

On every cycle the system interface compares all the system clocks to a reference clock. If any of the clocks

become invalid, the TMS380C26 enters the slow clock mode, which prevents latchup of the TMS380C26. If the

SBCLK is invalid, any DMA cycle is terminated immediately; otherwise, the DMA cycle is completed and then

the TMS380C26 is placed in slow clock mode.

When the TMS380C26 enters the slow clock mode, the clock that failed is replaced by a slow free-running clock

and the device is placed into a low-power reset state. When the failed clock(s) return to valid operation, the

TMS380C26 must be re-initialized.

Using DMA, a continuous transfer rate of 64 Mbits per second (Mbps), which is 8 MBytes per second (MBps),

can be obtained. For pseudo-DMA a continuous transfer rate of 48 Mbps (6 MBps) can be obtained when using

a16-MHzclock. TheDIOtransferrateisnotasignificantissue, sincethemainpurposeofDIOisfordownloading

and initialization. For comparison, the ISA bus continuous DMA transfer is rated for approximately 23 Mbps.

memory interface (MIF)

The Memory Interface (MIF) performs the memory management to allow the TMS380C26 to address 2 MBytes

in local memory. Hardware in the MIF allows the TMS380C26 to be directly connected to DRAMs without

additional circuitry. This glueless DRAM connection includes the DRAM refresh controller.

The MIF also handles all internal bus arbitration between these blocks. When required, the MIF then arbitrates

for the external bus.

The MIF is responsible for the memory mapping of the CPU of a task. The memory map of DRAMs, EPROMs,

Burned-in Addresses (BIA), and External Devices are appropriately addressed when required by the System

Interface (SIF), Protocol Handler (PH), or for a DMA transfer.

The memory interface is capable of a 64 Mbps continuous transfer rate when using a 4-MHz local bus (64-MHz

device crystal).

protocol handler (PH)

The Protocol Handler (PH) performs the hardware-based realtime protocol functions for a token ring or Ethernet

Local Area Network (LAN). Network type is determined by the test pins TEST0–2. Token ring network is

determined by software and can be either 16-Mbps or 4-Mbps. These speeds are not fixed by the hardware,

but by the software.

The (PH) converts the parallel transmit data to serial network data of the appropriate coding, and converts the

receivedserialdatatoparalleldata. ThePHdatamanagementstatemachinesdirectthetransmission/reception

of data to/from local memory through the MIF. The PH’s buffer management state machines automatically

oversee this process, directly sending/receiving linked-lists of frames without CPU intervention.

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The Protocol Handler contains many state machines which provide the following features:

•

Transmit and receive frames

Capture tokens (token ring)

Provide token-priority controls (token ring)

Automatic retry of frame transmissions after collisions (Ethernet)

Implement the Random Exponential Backoff algorithm (Ethernet)

Manage the TMS380C26 buffer memory

Provide frame address recognition (group, specific, functional, and multicast)

Provide internal parity protection

Control and verify the physical layer circuitry interface signals

Integrity of the transmitted and received data is assured by cyclic redundancy checks (CRC), detection of

network data violations, and parity on internal data paths. All data paths and registers are optionally

parity-protected to assure functional integrity.

adapter support function (ASF)

The Adapter Support Function (ASF) performs support functions not contained in the other blocks. The features

are:

•

The TMS380C26 base timer,

Identification, management, and service of internal and external interrupts,

Test pin mode control, including the unit-in-place mode for board testing,

Checks for illegal states, such as illegal opcodes and parity.

clock generator (CG)

The Clock Generator (CG) performs the generation of all the clocks required by the other functional blocks and

the local memory bus clocks. This block also generates the reference clock to be sampled by the SIF to

determine if the TMS380C26 needs to be placed into slow clock mode. This reference clock is free floating in

the range of 10 – 100 kHz.

user-accessible hardware registers and TMS380C26-internal pointers

The following tables show how to access internal data via pointers and how to address the registers in the host

interface. The SIFACL register, which directly controls device operation, is described in detail.

NOTE:

The Adapter-Internal Pointers Table is defined only after TMS380C26 initialization and until the OPEN

command is issued.

These pointers are defined by the TMS380C26 software (microcode), and this table describes the release

1.00 and 2.x software.

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†

Adapter-Internal Pointers for Token-Ring

ADDRESS

DESCRIPTION

‡

>00.FFF8

Pointer to software raw microcode level in chapter 0.

‡

>00.FFFA

Pointer to starting location of copyright notices. Copyright notices are separated by a >0A character and

terminated by a >00 character in chapter 0.

>01.0A00

>01.0A02

>01.0A04

Pointer to burned-in address in chapter 1.

Pointer to software level in chapter 1.

Pointer to TMS380C26 addresses in chapter 1:

Pointer + 0 node address.

Pointer + 6 group address.

Pointer + 10 functional address.

>01.0A06

Pointer to TMS380C26 parameters in chapter 1:

Pointer + 0 physical drop number.

Pointer + 4 upstream neighbor address.

Pointer + 10 upstream physical drop number.

Pointer + 14 last ring poll address.

Pointer + 20 reserved.

Pointer + 22 transmit access priority.

Pointer + 24 source class authorization.

Pointer + 26 last attention code.

Pointer + 28 source address of the last received frame.

Pointer + 34 last beacon type.

Pointer + 36 last major vector.

Pointer + 38 ring status.

Pointer + 40 soft error timer value.

Pointer + 42 ring interface error counter.

Pointer + 44 local ring number.

Pointer + 46 monitor error code.

Pointer + 48 last beacon transmit type.

Pointer + 50 last beacon receive type.

Pointer + 52 last MAC frame correlator.

Pointer + 54 last beaconing station UNA.

Pointer + 60 reserved.

Pointer + 64 last beaconing station physical drop number.

>01.0A08

>01.0A0A

Pointer to MAC buffer (a special buffer used by the software to transmit adapter generated MAC frames) in chapter 1.

Pointer to LLC counters in chapter 1:

Pointer + 0 MAX_SAPs.

Pointer + 1 open SAPs.

Pointer + 2 MAX_STATIONs.

Pointer + 3 open stations.

Pointer + 4 available stations.

Pointer + 5 reserved.

>01.0A0C

>01.0A0E

Pointer to 4-/16-Mbps word flag. If zero, then 4 Mbps. If nonzero, then the adapter is set to run at 16-Mbps data rate.

Pointer to total TMS380C26 RAM found in Kbytes in RAM allocation test in chapter 1.

†

‡

This table describes the pointers for release 1.00 and 2.x of the TMS380C26 software.

This address valid only for microcode release 2.x.

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†

Adapter-Internal Pointers for Ethernet

ADDRESS

DESCRIPTION

‡

>00.FFF8

Software raw microcode level in chapter 0.

‡

>00.FFFA

Pointer to starting location of copyright notices. Copyright notices are separated by a >0A character and

terminated by a >00 character in chapter 0.

>01.0A00

>01.0A02

>01.0A04

Pointer to burned-in address in chapter 1.

Pointer to software level in chapter 1.

Pointer to TMS380C26 addresses in chapter 1:

Pointer + 0 node address.

Pointer + 6 group address.

Pointer + 10 functional address.

>01.0A08

>01.0A0A

Pointer to MAC buffer (a special buffer used by the software to transmit adapter generated MAC frames) in chapter 1.

Pointer to LLC counters in chapter 1:

Pointer + 0 MAX_SAPs.

Pointer + 1 open SAPs.

Pointer + 2 MAX_STATIONs.

Pointer + 3 open stations.

Pointer + 4 available stations.

Pointer + 5 reserved.

>01.0A0C

>01.0A0E

Pointer to 4-/16-Mbps word flag. If zero, then 4 Mbps. If nonzero, then the adapter is set to run at 16-Mbps data rate.

Pointer to total TMS380C26 RAM found in Kbytes in RAM allocation test in chapter 1.

†

‡

This table describes the pointers for release 1.00 and 2.x of the TMS380C26 software.

This address valid only for microcode release 2.x.

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User-Access Hardware Registers

†

808x 16-Bit Mode: (SI/M = 1, S8/SHALT = 0)

Normal Mode

SBHE = 0

SRS2 = 0

Pseudo-DMA Mode Active

SBHE = 0

Word Transfers

SRS2 = 0

SBHE = 0

Byte Transfers

SBHE = 1

SRS2 = 0

SBHE = 0

SRS2 = 1

SBHE = 1

SRS2 = 0

SRS2 = 1

SRSX

SRS0

SRS1

SIFDAT MSB

SIFDAT LSB

SIFDAT/INC LSB

SIFADR LSB

SIFSTS

SIFACL LSB

SIFADR LSB

SIFADX LSB

DMALEN LSB

—

SDMADAT

SIFDAT/INC MSB

SIFADR MSB

SIFCMD

SIFACL MSB

SIFADR MSB

SIFADX MSB

DMALEN MSB

SDMAADR MSB

SDMAADX MSB

SIFACL MSB

SIFADR MSB

SIFADX MSB

DMALEN MSB

DMALEN LSB

SDMAADR LSB

SDMAADX LSB

SIFACL LSB

SIFADR LSB

SIFADX LSB

DMALEN LSB

†

(SBHE = 1 and SRS2 = 1 is not defined)

808x 8-Bit Mode: (SI/M = 1, S8/SHALT = 1)

Normal

SBHE = X

Pseudo-DMA

SBHE = X

SRSX

SRS0

SRS1

SRS2

SIFDAT LSB

SIFDAT MSB

SIFDAT/INC LSB

SIFDAT/INC MSB

SIFADR LSB

SIFADR MSB

SIFSTS

SDMADAT

—

DMALEN LSB

DMALEN MSB

SDMAADR LSB

SDMAADR MSB

SDMAADX LSB

SDMAADX MSB

SIFACL LSB

SIFACL MSB

SIFADR LSB

SIFADR MSB

SIFADX LSB

SIFADX MSB

DMALEN LSB

DMALEN MSB

SIFCMD

SIFACL LSB

SIFACL MSB

SIFADR LSB

SIFADR MSB

SIFADX LSB

SIFADX MSB

DMALEN LSB

DMALEN MSB

‡

68xxx Mode: (SI/M = 0)

Word Transfers

Normal Mode

SUDS = 0

Pseudo-DMA Mode Active

SUDS = 0

SLDS = 0

SUDS = 0

SLDS = 1

SUDS = 1

SLDS = 0

SUDS = 0

SLDS = 1

SUDS = 1

SLDS = 0

Byte Transfers

SRSX

SRS0

SRS1

SIFDAT MSB

SIFDAT/INC MSB

SIFADR MSB

SIFCMD

SIFACL MSB

SIFADR MSB

SIFADX MSB

DMALEN MSB

SIFDAT LSB

SIFDAT/INC LSB

SIFADR LSB

SIFSTS

SIFACL LSB

SIFADR LSB

SIFADX LSB

DMALEN LSB

—

SDMADAT

DMALEN MSB

SDMAADR MSB

SDMAADX MSB

SIFACL MSB

SIFADR MSB

SIFADX MSB

DMALEN MSB

DMALEN LSB

SDMAADR LSB

SDMAADX LSB

SIFACL LSB

SIFADR LSB

SIFADX LSB

DMALEN LSB

‡

68xxx Mode is always 16-bit.

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SIF Adapter Control Register (SIFACL)

The SIFACL register allows the host processor to control and to some extent reconfigure the

TMS380C26 under software control.

SIFACL Register

Bit #

NSEL NSEL

OUT0 OUT1

—

SWHLDA SWDDIR SWHRQ PSDMAEN ARESET CPHALT BOOT RES0 SINTEN

PEN

RP –0

R –u

R –0

RS –0

RW –0

RP –b

RW –1

RP –p RP-0 RP–1

R = Read, W = Write, P = Write during ARESET = 1 only, S = Set Only,

–n = Value after reset

(b = Value on BTSTRP pin, p = Value on PRTYEN pin, u = Indeterminate)

Bits 0-2:

TEST (0–2). Value on TEST (0–2) pins.

These bits are read only and always reflect the value on the corresponding device pins. This

allows the host S/W to determine the network type and speed configuration. If the network speed

and type are software configurable, these bits can be used to determine which configurations

are supported by the network hardware.

TEST0 TEST1 TEST2 Description

Reserved

16 Mbps token ring

Ethernet (802.3/Blue Book)

4 Mbps token ring

Reserved

Bit 3:

Bit 4:

Reserved. Read data is indeterminate.

SWHLDA — Software Hold Acknowledge

This bit allows the SHLDA/SBGR pin’s function to be emulated from software control for

pseudo-DMA.

PSDMAEN

SWHLDA

SWHRQ

RESULT

†

SWHLDA value in the SIFACL register cannot be set to a one.

No pseudo-DMA request pending.

†

Indicates a pseudo-DMA request interrupt.

Pseudo-DMA process in progress.

†

The value on the SHLDA/SBGR pin is ignored.

Bit 5:

SWDDIR — Current SDDIR Signal Value

This bit contains the current value of the pseudo-DMA direction. This enables the host to easily

determine the direction of DMA transfers, which allows system DMA to be controlled by system

software.

Pseudo-DMA from host system to TMS380C26.

Pseudo-DMA from TMS380C26 to host system.

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Bit 6:

SWHRQ — Current SHRQ Signal Value

This bit contains the current value on the SHRQ/SBRQ pin when in Intel mode, and the inverse

of the SHRQ/SBRQ pin when in Motorola mode. This enables the host to easily determine if a

pseudo-DMA transfer is requested.

INTEL MODE (SI/M pin = H)

System bus not requested

System bus requested

MOTOROLA MODE (SI/M pin = L)

System bus not requested

System bus requested

0 =

1 =

Bit 7:

Bit 8:

PSDMAEN — Pseudo-System-DMA Enable

This bit enables pseudo-DMA operation

Normal bus master DMA operation possible.

Pseudo-DMA operation selected. Operation dependent on the values of the SWHLDA

and SWHRQ bits in the SIFACL register.

ARESET — Adapter Reset

This bit is a hardware reset of the TMS380C26. This bit has the same effect as the SRESET pin,

except that the DIO interface to the SIFACL register is maintained. This bit will be set to one if

a clock failure is detected (OSCIN, PXTALIN, RCLK, or SBCLK not valid).

The TMS380C26 operates normally.

The TMS380C26 is held in the reset condition.

Bit 9:

CPHALT — Communications Processor Halt

This bit prevents the TMS380C26’s processor from accessing the internal TMS380C26 buses.

This prevents the TMS380C26 from executing instructions before the microcode has been

downloaded.

The TMS380C26’s processor can access the internal TMS380C26 buses.

The TMS380C26’s processor is prevented from accessing the internal adapter buses.

Bit 10:

Bit 11:

BOOT — Bootstrap CP Code

This bit indicates whether the memory in chapters 0 and 31 of the local memory space is RAM

or ROM/PROM/EPROM. This bit then controls the operation of the MCAS and MROMEN pins.

ROM/PROM/EPROM memory in chapters 0 and 31.

RAM memory in chapters 0 and 31.

RES0 — Reserved. This bit must be set to zero

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Bit 12:

SINTEN — System-Interrupt Enable

This bit allows the host processor to enable or disable system interrupt requests from the

TMS380C26.Thesystem interruptrequestfromtheTMS380C26isontheSINTR/SIRQpin. The

following equation shows how the SINTR/SIRQ pin is driven. The table also explains the results

of the states.

SINTR/SIRQ = (PSDMAEN * SWHRQ * !SWHLDA) + (SINTEN * SYSTEM_INTERRUPT)

SYSTEM

PSDMAEN SWHRQ SWHLDA SINTEN

INTERRUPT

RESULT

(SIFSTS Reg.)

†

Pseudo-DMA is active.

The TMS380C26 generated a system

interrupt for a pseudo-DMA.

Not a pseudo-DMA interrupt.

The TMS380C26 will generate a system

interrupt.

The TMS380C26 will not generate a system

interrupt.

The TMS380C26 can not generate a system

interrupt.

†

The value on the SHLDA/SBGR pin is ignored.

Bit 13:

PEN — Adapter Parity Enable

This bit determines whether data transfers within the TMS380C26 are checked for parity.

Data transfers are not checked for parity

Data transfers are checked for correct odd parity.

Bit 14 — 15: NSELOUT (0–1) — Network selection outputs.

The values in these bits control the output pins NSELOUT0 and NSELOUT1. These bits can only

be modified while the ARESET bit is set.

These bits can be used to software configure a multi-protocol TMS380C26, as follows:

The NSELOUT0 and NSELOUT1 pins should be connected to TEST0 and TEST1 pins

respectively (TEST2 should be left unconnected or tied high). NSELOUT0 should be used to

select network speed and NSELOUT1 network type, as shown in the table below:

NSELOUT0

NSELOUT1

Reserved

16 Mbps token ring

Ethernet (802.3/Blue Book)

4 Mbps token ring

At power-up these bits are set NSELOUT1 = 1, NSELOUT0 = 0 corresponding to 16 Mbps token

ring.

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SIFACL Control for Pseudo-DMA Operation

Pseudo-DMA is software controlled by the use of five bits in the SIFACL register. The logic model for the SIFACL

Internal

Signals

Motorola Mode

Host

Interface

SINTR/SIRQ

SYSTEM_INTERRUPT

(SIFSTS Register)

SHRQ/SBRQ

SHLDA/SBGR

DMA

Request

DMA

Grant

SDDIR

DMADIR

SWHLDA

SWDDIR

SWHRQ

SIFACL Register

PSDMAEN

SINTEN

Figure 3. Pseudo-DMA Logic Related to SIFACL Bits

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†

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage range, V

(see Note 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

Input voltage range (see Note 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 20 V

Output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 2 V to 7 V

Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 W

Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C

Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 6: Voltage values are with respect to V

recommended operating conditions

MIN NOM

MAX

5.25

UNIT

Supply voltage

4.75

Supply voltage (see Note 7)

+0.3

0.6

TTL-level signal

2.0

†

High-level input voltage

OSCIN

2.6

RCLK, PXTALIN, RCVR

2.6

‡

OSCIN

–0.3

Low-level input voltage, TTL-level signal (see Note 8)

All other

0.8

High level output current

–400

µA

°C

Low level output current (see Note 9)

Operating free-air temperature

†

The minimum level specified is a result of the manufacturing test environment. This signal has been characterized to a minimum level of

2.4 V over the full temperature range.

The maximum level specified is a result of the manufacturing test environment. This signal has been characterized to a maximum level of

0.8 V over the full temperature range.

‡

NOTES: 7. All V

pins should be routed to minimize inductance to system ground.

8. The algebraic convention, where the more negative (less positive) limit is designated as a minimum, is used in this data sheet for

logic voltage levels only.

9. Output current of 2 mA is sufficient to drive five low-power Schottky TTL loads or ten advanced low-power Schottky TTL loads (worst

case).

electrical characteristics over full ranges of recommended operating conditions (unless otherwise

noted)

TEST CONDITIONS

PARAMETER

MIN

TYP

MAX

UNIT

(see Note 10)

High-level output voltage, TTL-level signal (see Note 11)

Low-level output voltage, TTL-level signal

= min, I

= max

2.4

0.6

= max, V = 2.4 V

High-impedance output current

µA

= max, V = 0.4 V

– 20

± 20

220

Input current, any input or input/output pin

Supply current

V = V

to V

µA

= max

Input capacitance, any input

f = 1 MHz, other pins at 0 V

Output capacitance, any output or input/output

NOTES: 10. For conditions shown as MIN or MAX, use the appropriate value specified under the recommended operating conditions.

11. The following signals require an external pullup resistor: SRAS/SAS, SRDY/SDTACK, SRD/SUDS, SWR/SLDS,

EXTINT0–EXTINT3, and MBRQ.

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PARAMETER MEASUREMENT INFORMATION

Outputs are driven to a minimum high-logic level of 2.4 volts and to a maximum low-logic level of 0.6 volts. These

levels are compatible with TTL devices.

Output transition times are specified as follows: For a high-to-low transition on either an input or output signal,

the level at which the signal is said to be no longer high is 2 volts, and the level at which the signal is said to be

low is 0.8 volts. For a low-to-high transition, the level at which the signal is said to be no longer low is 0.8 volts,

and the level at which the signal is said to be high is 2 volts, as shown below.

The rise and fall times are not specified but are assumed to be those of standard TTL devices, which are typically

1.5 ns.

2 V (High)

0.8 V (Low)

test measurement

The test load circuit shown in Figure 4 represents the programmable load of the tester pin electronics which are

used to verify timing parameters of TMS380C26 output signals.

Tester Pin

Electronics

Output

Under

Test

LOAD

Where:

= 2.0 mA DC level verification (all outputs)

= 400 µA (all outputs)

= 1.5 V typical DC level verification

0.7 V typical timing verification

LOAD

C = 65 pF typical load circuit capacitance

Figure 4. Test Load Circuit

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PARAMETER MEASUREMENT INFORMATION

Reference

4 Periods

8 Periods

12 Periods

16 Periods

20 Periods

OSCIN

When

CLKDIV = 1

OSCOUT

†

MBCLK1

†

MBCLK2

†

The MBCLK1 and MBCLK2 signals have no timing relationship to the OSCOUT signal. The MBCLK1 and MBCLK2 signals can start on any

OSCIN rising edge, depending on when the memory cycle starts execution.

Figure 5. Clock Waveforms After Clock Stabilization

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PARAMETER MEASUREMENT INFORMATION

timing parameters

The timing parameters for all the pins of TMS380C26 are shown in the following tables and are illustrated in the

accompanying figures. The purpose of these figures and tables is to quantify the timing relationships among

the various signals. The parameters are numbered for convenience.

static signals

The following table lists signals that are not allowed to change dynamically and therefore have no timing

associated with them. They should be strapped high or low as required.

SIGNAL

SI/M

FUNCTION

Host processor select. (Intel/Motorola)

Reserved

CLKDIV

BTSTRP

PRTYEN

TEST0

TEST1

TEST2

TEST3

TEST4

TEST5

Default bootstrap mode. (RAM/ROM)

Default parity select. (enabled/disabled)

Test pin, indicates network type

†

Test pin for TI manufacturing test.

†

For unit-in-place test.

timing parameter symbology

Timing parameter symbols have been created in accordance with JEDEC standard 100. In order to shorten the

symbols, some of the pin names and other related terminology have been abbreviated as shown below:

DRVR

OSCIN

SBCLK

SRESET

, V

DRN

OSC

SCK

VDD

DDL DDB

Lower case subscripts are defined as follows:

cycle time

rise time

delay time

skew

hold time

setup time

transition time

pulse duration (width)

The following additional letters and phrases are defined as follows:

High

Low

Valid

High impedance

No longer high

No longer low

Falling edge

Rising edge

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PARAMETER MEASUREMENT INFORMATION

power up, SBCLK, OSCIN, MBCLK1, MBCLK2, SYNCIN, and SRESET timing

NO.

PARAMETER

Rise time from 1.2 V to V minimum high level

MIN

MAX

UNIT

†

100

101

102

103

104

105

106

107

108

109

)

r(VDD

†‡

Delay time from minimum V

Cycle time of SBCLK

high level to first valid SBCLK no longer high

high level to first valid OSCIN high

d(VDDH-SCKV)

d(VDDH-OSCV)

c(SCK)

62.5

Pulse duration of SBCLK high

Pulse duration of SBCLK low

Transition time of SBCLK

w(SCKH)

w(SCKL)

t(SCK)

†

Cycle time of OSCIN (see Note 12)

Pulse duration of OSCIN high

15.6

5.5

500

c(OSC)

w(OSCH)

w(OSCL)

t(OSC)

Pulse duration of OSCIN low

5.5

†

110

Transition time of OSCIN

†

111

117

118

119

288

289

Delay time from OSCIN valid to MBCLK1 and MBCLK2 valid

µs

d(OSCV-CKV)

h(VDDH-RSL)

w(RSH)

†

Hold time of SRESET low after V

Pulse duration of SRESET high

Pulse duration of SRESET low

reaches minimum high level

µs

w(RSL)

†

Setup time of DMA size to SRESET high (Intel mode only)

Hold time of DMA size from SRESET high (Intel mode only)

One-eighth of an local memory cycle

su(RST)

h(RST)

c(OSC)

†

‡

This specification is provided as an aid to board design.

If parameter 101 or 102 cannot be met, parameter 117 must be extended by the larger difference: real value of parameter 101 or 102 minus the

max value listed.

NOTE 12: If OSCIN is used to generate PXTALIN, the specification for the tolerance of OSCIN is equal to ± 0.01%.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

100

Minimun V

High Level

103

106

104

101

105

SBCLK

OSCIN

107

102

110

108

110

109

MBCLK1

MBCLK2

111

118

117

119

SRESET

288

289

S8/SHALT

NOTE A: In order to represent the information on one figure, non-actual phase and timebase characteristics are shown. Please refer to specified

parameters for precise information.

Figure 6. Power Up, SBCLK, OSCIN, MBCLK1, MBCLK2, SYNCIN, and SRESET Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: clocks, MAL, MROMEN, MBIAEN, NMI, MRESET, and ADDRESS

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

Period of MBCLK1 and MBCLK2

MIN

MAX

UNIT

Pulse duration of clock high

2t –9

Pulse duration of clock low

2t –9

Hold time of MBCLK2 low after MBCLK1 high

–9

Hold time of MBCLK1 high after MBCLK2 high

Hold time of MBCLK2 high after MBCLK1 low

Hold time of MBCLK1 low after MBCLK2 low

Setup time of address/enable on MAX0, MAX2, and MROMEN before MBCLK1 no longer high

Setup time of row address on MADL0–MADL7, MAXPH, and MAXPL before MBCLK1 no longer high

Setup time of address on MADH0–MADH7 before MBCLK1 no longer high

Setup time of MAL high before MBCLK1 no longer high

Setup time of address on MAX0, MAX2, and MROMEN before MBCLK1 no longer low

–14

–13

0.5t –9

Setup time of column address on MADL0–MADL7, MAXPH, and MAXPL before MBCLK1 no

longer low

0.5t –9

Setup time of status on MADH0–MADH7 before MBCLK1 no longer low

Setup time of NMI valid before MBCLK1 low

0.5t –9

120

121

126

129

Hold time of NMI valid after MBCLK1 low

Delay time from MBCLK1 no longer low to MRESET valid

Hold time of column address/status after MBCLK1 no longer low.

–7

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MBCLK1

MBCLK2

MAX0,

MAX2,

MROMEN

ADD/EN

Address

MAXPH,

MAXPL,

MADL0–MADL7

Row

Col

Status

Address

MADH0–MADH7

MAL

129

120

121

NMI

Valid

126

Valid

MRESET

Figure 7. Memory Bus Timing: Clocks, MAL, MROMEN, MBIAEN, NMI, MRESET, and ADDRESS

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: clocks, MRAS, MCAS, and MAL to ADDRESS

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

1.5t – 11.5

MAX

UNIT

Setup time of row address on MADL0–MADL7, MAXPH, and MAXPL before MRAS no longer

high

Hold time of row address on MADL0–MADL7, MAXPH, and MAXPL after MRAS no longer high

Delay time from MRAS no longer high to MRAS no longer high in the next memory cycle

Pulse duration of MRAS low

–6.5

4.5t –9

Pulse duration of MRAS high

3.5t –9

Setup time of column address (MADL0–MADL7, MAXPH, and MAXPL) and status

(MADH0–MADH7) before MCAS no longer high

0.5t –9

Hold time of column address (MADL0–MADL7, MAXPH, and MAXPL) and status

(MADH0–MADH7) after MCAS low

–9

Hold time of column address (MADL0–MADL7, MAXPH, and MAXPL) and status

(MADH0–MADH7) after MRAS no longer high

2.5t –6.5

Pulse duration of MCAS low

3t –9

Pulse duration of MCAS high, refresh cycle follows read or write cycle

Hold time of row address on MAXL0–MAXL7, MAXPH, and MAXPL after MAL low

SetuptimeofrowaddressonMAXL0–MAXL7, MAXPH, andMAXPLbeforeMALnolongerhigh

Pulse duration of MAL high

2t –9

1.5t –9

–9

Setup time of address/enable on MAX0, MAX2, and MROMEN before MAL no longer high

Hold time of address/enable of MAX0, MAX2, and MROMEN after MAL low

Setup time of address on MADH0–MADH7 before MAL no longer high

Hold time of address on MADH0–MADH7 after MAL low

1.5t –9

–9

1.5t –9

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MAXPH,

MAXPL,

MADL0–MADL7

Row

Column

Row

Column

MRAS

MCAS

MAL

MAX0,

MAX2,

MROMEN

ADD/EN

Address

Status

Address

Status

MADH0–MADH7

Figure 8. Memory Bus Timing: Clocks, MRAS, MCAS, and MAL to ADDRESS

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: read cycle

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

MAX

6t – 23

UNIT

Access time from address/enable valid on MAX0, MAX2, and MROMEN to valid data/parity

Access time from address valid on MAXPH, MAXPL, MADH0–MADH7, and MADL0–MADL7

to valid data/parity

6t –23

Access time from MRAS low to valid data/parity

4.5t –21.5

Hold time of valid data/parity after MRAS no longer low

Hold time of address high impedance on MAXPH, MAXPL, MADH0–MADH7 and

MADL0–MADL7 after MRAS high (see Note 13)

†

2t –10.5

Access time from MCAS low to valid data/parity

3t –23

Hold time of valid data/parity after MCAS no longer low

Hold time of address high impedance on MAXPH, MAXPL, MADH0–MADH7, and

MADL0–MADL7 after MCAS high (see Note 13)

†

2t –13

Delay time from MCAS no longer high to MOE low

+13

Setup time of address/status high impedance on MAXPH, MAXPL, MADL0–MADL7, and

MADH0–MADH7 before MOE no longer high

†

Access time from MOE low to valid data/parity

Pulse duration MOE low

2t –25

2t –9

Delay time from MCAS low to MOE no longer low

Hold time of valid data/parity in after MOE no longer low

3t –9

Hold time of address high impedance on MAXPH, MAXPL, MADH0–MADH7, and

MADL0–MADL7 after MOE high (see Note 13)

†

2t –15

Setup time of address/status high impedance on MAXPH, MAXPL, MADL0–MADL7, and

MADH0–MADH7, before MBEN no longer high

†

Setup time of address/status high impedance on MAXPH, MAXPL, MADL0–MADL7, and

MADH0–MADH7 and before MBIAEN no longer high

†

48a

Access time from MBEN low to valid data/parity

Access time from MBIAEN low to valid data/parity

Pulse duration MBEN low

2t –25

49a

2t –25

2t –9

50a

Pulse duration MBIAEN low

2t –9

Hold time of valid data/parity after MBEN no longer low

Hold time of valid data/parity after MBIAEN no longer low

51a

Hold time of address high impedance on MAXPH, MAXPL, MADH0–MADH7, and

MADL0–MADL7 after MBEN high (see Note 13)

†

2t –15

Hold time of address high impedance on MAXPH, MAXPL, MADH0–MADH7, and

MADL0–MADL7 after MBIAEN high

†

52a

2t –15

Hold time of MDDIR high after MBEN high, read follows write cycle

Setup time of MDDIR low before MBEN no longer high

1.5t –12

3t –9

Hold time of MDDIR low after MBEN high, write follows read cycle

3t –12

†

This specification has been characterized to meet stated value.

NOTE 13: The data/parity that exists on the address lines will most likely achieve a high-impedance condition sometime later than the rising edge,

of MRAS, MCAS, MOE, or MBEN (between MIN and MAX of timing parameter 36) and will be a function of the memory being read.

Hence, the MIN time given represents the time from the rising edge of MRAS, MCAS, MOE, or MBEN to the beginning of the next

address, and does not represent the actual high-impedance period on the address bus.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MAX0,

MAX2,

MROMEN

Address/

Enable

Address

Data/Parity

MAXPH, MAXPL,

MADH0–MADH7,

MADL0–MADL7

Address/

Status

Address

MRAS

MCAS

MOE

49a

48a

51a

50a

52a

MBIAEN

MBEN

MDDIR

Figure 9. Memory Bus Timing: Read Cycle

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: write cycle

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

Setup time of MW low before MRAS no longer low

Setup time of MW low before MCAS no longer low

Setup time of valid data/parity before MW no longer high

Pulse duration of MW low

MIN

1.5t – 9

MAX

UNIT

1.5t –6.5

0.5t –11.5

2.5t –9

Hold time of data/parity out valid after MW high

Setup time of address valid on MAX0, MAX2, and MROMEN before MW no longer low

Hold time from MRAS low to MW no longer low

Hold time from MCAS low to MW no longer low

Setup time of MBEN low before MW no longer high

Hold time of MBEN low after MW high

0.5t –10.5

7t –11.5

5.5t –9

4t –11.5

1.5t –13.5

0.5t –6.5

Setup time of MDDIR high before MBEN no longer high

Hold time of MDDIR high after MBEN high

2t –9

1.5t –12

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MAX0,

MAX2,

MROMEN

Address/

Enable

Address

MAXPH, MAXPL,

MADH0–MADH7,

MADL0–MADL7

Address

ADD/STS

Data/Parity Out

MRAS

MCAS

MBEN

MDDIR

Figure 10. Memory Bus Timing: Write Cycle

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: TMS380C26 releases control of bus

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

0.5t – 13

MAX

UNIT

Hold time of MIF output after MBCLK1 rising edge, bus release

Hold time of MBEN valid after MBCLK1 rising edge, bus release

Delay time from MBCLK1 high to MIF output high impedance, bus release

Delay time from MBCLK1 high to MBEN output high impedance, bus release

Setup time of MBRQ low before MBCLK1 falling edge, bus release

Hold time of MBRQ low after MBCLK1 low, bus release

74a

– 13

0.5t

75a

Setup time of MBGR low before MBCLK1 rising edge, bus release

MBCLK1

MAX0,

MAX2,

MROMEN

MAXPH,

MAXPL,

MADH0–MADH7,

MADL0–MADL7

MRAS

MCAS

MOE

Figure 11. Memory Bus Timing: TMS380C26 Releases Control of Bus

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MBCLK1

MBCLK2

MBEN

75a

74a

MDDIR

MAL

MBIAEN

MBRQ

MBGR

Figure 12. Memory Bus Timing: TMS380C26 Releases Control of Bus (continued)

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: TMS380C26 resumes control of bus

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

– 13

MAX

UNIT

Hold time of MIF output high impedance after MBCKL1 rising edge, bus resume

Delay time from MBCLK1 high to MIF output vallid, bus resume

Setup time of MBRQ valid before MBCLK1 falling edge, bus resume

Hold time of MBRQ valid after MBCLK1 low, bus resume

+ 9

Setup time of MBGR high before MBCLK1 rising edge, bus resume

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MBCLK1

MAX0,

MAX2,

MOROMEN

MAXPH,

MAXPL,

MADH0–MADH7,

MADL0–MADL7

MRAS

MCAS

MOE

Figure 13. Memory Bus Timing: TMS380C26 Resumes Control of Bus

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MBCLK1

MBCLK2

MBEN

MDDIR

MAL

MBIAEN

MBRQ

MBGR

Figure 14. Memory Bus Timing: TMS380C26 Resumes Control of Bus (continued)

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: external bus master read from TMS380C26

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

MAX

UNIT

SetuptimeofaddressonMAX0andMAX2beforeMBCLK1fallingedge, externalbusmasteraccess

Hold time of address on MAX0 and MAX2 after MBCLK1 low, external bus master access

Setup time of valid address before MBCLK1 falling edge, external bus master access

Hold time of valid address after MBCLK1 low, external bus master access

Setup time of address high impedance before MBCLK1 falling edge, external bus master read

Setup time of data/parity valid before MBCLK2 falling edge, external bus master read

Hold time of valid data/parity after MBCLK2 low, external bus master read

†

1.5t – 17

– 13

Setup time of data/parity high impedance before MBCLK2 rising edge, external bus master read

Setup time of MDDIR low before MBCLK2 falling edge, external bus master read

Hold time of MDDIR low after MBCLK2 low, external bus master read

– 9

Setup time of MACS low before MBCLK2 falling edge, external bus master read

Hold time of MACS low after MBCLK2 low, external bus master read

†

This specification has been characterized to meet stated value.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

MBCLK1

MBCLK2

Address In

MAX0,

MAX2

MAXPH,

MAXPL,

MADH0–MADH7,

MADL0–MADL7

Data/Parity

Address In

MDDIR

MACS

Figure 15. Memory Bus Timing: External Bus Master Read From TMS380C26

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: external bus master write to TMS380C26

NO.

PARAMETER

MIN

MAX

UNIT

Setup time of valid data/parity before MBCLK2 falling edge, external bus master write

Hold time of valid data/parity after MBCLK2 low, external bus master write

Setup time of MDDIR high before MBCLK2 falling edge, external bus master write

Hold time of MDDIR high after MBCLK2 low, external bus master write

MBCLK1

Address In

MAX0, MAX2

MAXPH,

MAXPL,

MADH0–MADH7,

MADL0–MADL7

Address In

Data/Pty

Address In

MDDIR

MACS

Figure 16. Memory Bus Timing: External Bus Master Write To TMS380C26

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

memory bus timing: DRAM refresh timing

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

1.5t –11.5

MAX

UNIT

Setup time of row address on MADL0–MADL7, MAXPH, and MAXPL before MRAS no longer

high

Hold time of row address on MADL0–MADL7, MAXPH, and MAXPL after MRAS no longer high

Pulse duration of MRAS low

–6.5

4.5t –9

Pulse duration of MRAS high

3.5t –9

73a Setup time of MCAS low before MRAS no longer high

73b Hold time of MCAS low after MRAS low

1.5t –11.5

4.5t – 6.5

73c Setup time of MREF high before MCAS no longer high

73d Hold time of MREF high after MCAS high

–14

–9

Refresh

Address

MADL0–MADL7

Address

MRAS

73a

73b

MCAS

73c

73d

MREF

Figure 17. Memory Bus Timing: DRAM Refresh Cycle

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

XMATCH and XFAIL timing

is the cycle time of one-eighth of a local memory cycle (31.25 ns minimum)

NO.

PARAMETER

MIN

MAX

UNIT

127 Delay from status bit 7 high to XMATCH and XFAIL recognized

128 Pulse duration of XMATCH or XFAIL high

Status

MADH7

Bit 7

127

128

XMATCH,

XFAIL

Figure 18. XMATCH and XFAIL Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

token ring — ring interface timing

No.

PARAMETER

MIN

TYP

125

MAX UNIT

4Mbps

153

Period of RCLK (see Note 14)

16 Mbps

31.25

4 Mbps nominal: 62.5 ns

16 Mbps nominal: 15.625 ns

4 Mbps nominal: 62.5 ns

16 Mbps nominal: 15.625 ns

154L Pulse duration of RCLK low

154H Pulse duration of RCLK high

155

156

Setup of RCVR valid before rising edge (1.8 V) of RCLK at 16 Mbps

Hold of RCVR valid after rising edge (1.8 V) of RCLK at 16 Mbps

4 Mbps

158L Pulse duration of ring baud clock low

158H Pulse duration of ring baud clock high

16 Mbps

4 Mbps

16 Mbps

4 Mbps

125

165

166

Period of OSCOUT and PXTALIN (see Note 14)

Tolerance of PXTALIN input frequency (see Note 14)

16 Mbps (for PXTALIN only)

31.25

± 0.01

NOTE 14: This parameter is not tested but is required by the IEEE 802.5 specification.

153

154H

RCLK

154L

156

155

RCVR

Valid

158H

158L

OSCOUT,

PXTALIN

165

Figure 19. Token Ring — Ring Interface Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

token ring — transmitter timing (see Figure 20)

NO.

PARAMETER

MIN TYP MAX

UNIT

Delay from DRVR rising edge (1.8 V) to DRVR falling edge (1.0 V) or DRVR falling edge (1.0 V) to

DRVR rising edge (1.8 V)

159

±2

†

160

161

162

163

Delay from RCLK (or PXTALIN) falling edge (1.0 V) to DRVR rising edge (1.8 V)

Delay from RCLK (or PXTALIN) falling edge (1.0 V) to DRVR falling edge (1.0 V)

Delay from RCLK (or PXTALIN) falling edge (1.0 V) to DRVR rising edge (1.8 V)

(see Note 15)

†

t_d(DR)Lt_d(CRN)H

t_d(DR)Ht_d(DRN)L

DRVR/DRVR Asymmetry

164

±1.5

–

†

When in active-monitor mode, the clock source is PXTALIN; otherwise, the clock-source is either RCLK or PXTALIN.

NOTE 15: This parameter is not tested to a minimum or a maximum but is measured and used as a component required for parameter 164.

2.60

RCLK or PXTALIN

DRVR

1.50

0.60

2.40

1.50

0.60

160

161

159

2.40

1.50

0.60

DRVR

162

163

Figure 20. Skew and Asymmetry from RCLK or PXTALIN to DRVR and DRVR

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

ethernet timing of clock signals

NO.

PARAMETER

MIN

TYP

MAX

UNIT

300

301

CLKPHS Pulse duration of TXC

CLKPER Cycle time of TXC

1000

301

300

2.4 V

TXC

0.45 V

300

Figure 21. Ethernet Timing Of Clock Signals

ethernet timing of XMIT signals

NO.

PARAMETER

Hold time of TXD after TXC high

MIN

TYP

MAX

UNIT

305

XDHLD

Delay time from TXC high to TXD valid and

Delay time from TXC high to TXEN high

306

XDVLD

TXC

305

306

2.4 V

TXD

0.45 V

2.4 V

306

TXEN

0.45 V

Figure 22. Ethernet Timing of XMIT Signals

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

ethernet timing of RCV signals — start of frame

NO.

310

311

312

313

314

315

PARAMETER

MIN

TYP

MAX

UNIT

RXDSET Setup of RXD before RXC no longer low

RXDHLD Hold of RXD after RXC high

CRSSET Setup of CRS high before RXC no longer low for first valid data sample

SAMDLY Delay of CRS internally recognized to first valid data sample (see Notes 16 and 17)

nominal 3 clk cycles

RXCHI

RXCL0

Pulse duration of RXC high

Pulse duration of RXC low

NOTES: 16. For valid frame synchronization one of the following data sequences must be received. Any other pattern will delay frame

synchronization until after the next CRS rising edge.

0n(10)

10n(10)

where n is an integer and n is greater than or equal to 3

17. If a previous frame or frame fragment completed without extra RXC clock cycles (XTRCVC = 0), then SAMDLY = 2 clock cycles.

312

CRS

313

314

RXC

RXD

315

311

310

Figure 23. Ethernet Timing of RCV Signals — Start Of Frame

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

ethernet timing of RCV signals — end of frame

NO.

PARAMETER

MIN

TYP

MAX

UNIT

Setup time of CRS low before RXC no longer low to determine if last data bit ”seen” on

previous RXC no longer low (see Note 18)

320

CRSSET

CRSHLD

Hold time of CRS low after RXC no longer low, to determine if last data bit ”seen” on

previous RXC no longer low

321

322

XTRCYC Number of extra RXC clock cycles after last data bit (CRS pin is low) (see Note 18)

cycle

NOTE 18: TMS380C26 will operate correctly even with no extra RXC clock cycles, providing that CRS does not remain asserted longer than

2 µs (see timing spec, NDRXC). Providing no extra clocks affect receive startup timing, see timing spec, SAMDLY.

RXC

320

321

CRS

322

RXD

Last

Data Bit

Figure 24. Ethernet Timing of RCV Signals — End Of Frame

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

ethernet timing of RCV signals — no RXC

NO.

PARAMETER

MIN

TYP

MAX

UNIT

330

NORXC

Time with no clock pulse on RXC, when CRS is high (see Note 19)

µs

NOTE 19: If NORXC is exceeded local clock failure circuitry may become activated, resetting the device.

CRS ”1”

330

RXC

Figure 25. Ethernet Timing of RCV Signals — No RXC

ethernet timing of XMIT signals

NO.

PARAMETER

MIN

TYP

MAX

UNIT

Delay time from TXC high of the last transmitted data bit (TXEN is high) to COLL

sampled high, so not to generate a ”heart-beat” error

340

HBWIN

47 cycles

341

342

COLPUL Minimum pulse duration of COLL high for guaranteed sample

COLSET Setup of COLL high to TXC high

20 ns + 1 cycle

TXC

340

341

COLL

342

TXD

TXEN

Figure 26. Ethernet Timing of XMIT Signals

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

ethernet timing of XMIT signals

NO.

PARAMETER

MIN

TYP

MAX

UNIT

Time from COLL sampled high (TXC high) to first transmitted ”JAM” bit on TXD

(see Note 20)

350

JAMTIM

cycles

351

352

COLSET Setup of COLL high before TXC high

COLPUL Minimum pulse duration of COLL high for guaranteed sample

20 ns + 1 cycle

NOTE 20: The JAM pattern is delayed until after the completion of the preamble pattern. The TMS380C26 transmits a JAM pattern of all ”1”s.

350

TXC

TXD

Data

JAM

COLL

351

352

Figure 27. Ethernet Timing of XMIT Signals

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x DIO read timing

NO.

PARAMETER

Delay from SRDY low to either SCS or SRD high

Pulse duration, SRAS high

MIN

MAX

UNIT

255

256

259

260

261

†

Hold of SAD high-impedance after SRD low (see Note 21)

Setup of SADH0–SADH7, SADL0–SADL7, SPH and SPL valid before SRDY low

Delay from SRD or SCS high to SAD high-impedance (see Note 21)

Hold of output data valid after SRD or SCS high (see Note 21)

Setup of SRSX, SRS0–SRS2, SCS, and SBHE valid to SRAS no longer high (see Note 22)

Hold of SRSX, SRS0–SRS2, SCS, and SBHE valid after SRAS low

Setup of SRAS high to SRD no longer high (see Note 22)

261a

264

265

266a

‡

267

268

Setup of SRSX, SRS0–SRS2 valid before SRD no longer high (see Note 21)

Hold of SRSX, SRS0–SRS2 valid after SRD no longer low (see Note 22)

Setup time of SRD, SWR, and SIACK high from previous cycle to SRD no longer high

Hold time of SRD, SWR, and SIACK high after SRD high

272a

273a

275

Delay from SRD and SWR, or SCS high to SRDY high (see Note 21)

Delay from SRD and SWR, high to SRDY high impedance

†

279

282a

282R

Delay from SDBEN low to SRDY low in a read cycle

Delay from SRD low to SDBEN low (see TMS380 Second Generation Token-Ring User’s Guide,

SPWU005, subsection 3.4.1.1.1), provided previous cycle completed.

283R

286

Delay from SRD high to SDBEN high (see Note 21)

Pulse duration, SRD high between DIO accesses (see Note 21)

†

‡

This specification is provided as an aid to board design.

It is the later of SRD and SWR or SCS low that indicates the start of the cycle.

NOTES: 21. The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

22. In 80x8x mode, SRAS may be used to strobe the values of SBHE, SRSX, SRS0 – SRS2, and SCS. When used to do so, SRAS

must meet parameter 266a, and SBHE, SRS0–SRS2, and SCS must meet parameter 264. If SRAS is strapped high, then

parameters 266a and 264 are irrelevant, and parameter 268 must be met.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

SCS, SRSX,

SRS0–SRS2,

SBHE

Valid

264

Valid (see Note A)

265

268

SRAS

256

266a

267

SIACK

272a

273a

SWR

SRD

272a

273a

286

(High)

SDDIR

279

282R

283R

SDBEN

275

255

282a

260

†

HI-Z

SRDY

261

261a

259

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

Output Data Valid

(see Note B)

†

When the TMS380C26 begins to drive SDBEN inactive, it has already latched the write data internally. Parameter 263 must be met to the input

of the data buffers.

NOTES: A. In 80x8x mode, SRAS may be used to strobe the values of SBHE, SRSX, SRS0–SRS2, and SCS. When used to do so, SRAS must

meet parameter 266a, and SBHE, SRS0–SRS2, and SCS must meet parameter 264. If SRAS is strapped high, then parameters

266a and 264 are irrelevant, and parameter 268 must be met.

B. In 8-bit 80x8x mode DIO reads, the SADH0–SADH7 contain don’t care data.

Figure 28. 80x8x DIO Read Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x DIO write timing

NO.

PARAMETER

Delay from SRDY low to either SCS or SWR high

Pulse duration, SRAS high

MIN

MAX

UNIT

255

256

262

263

264

265

266a

Setup of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid before SCS or SWR no longer low

Hold of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid after SCS or SWR high

Setup of SRSX, SRS0–SRS2, SCS, and SBHE to SRAS no longer high (see Note 21)

Hold of SRSX, SRS0–SRS2, SCS, and SBHE after SRAS low

Setup of SRAS high to SWR no longer high (see Note 22)

†

267

Setup of SRSX, SRS0–SRS2 before SWR no longer high (see Note 21)

Hold of SRSX, SRS0–SRS2 valid after SWR no longer low (see Note 22)

Setup time of SRD, SWR, and SIACK high from previous cycle to SWR no longer high

Hold time of SRD, SWR, and SIACK high after SWR high

268

272a

273a

Delay from SRDY low in the first DIO access to the SIF register to SRDY low in the immediately following

access to the SIF (see TMS380 Second-Generation Token Ring User’s Guide, SPWU005, subsection

3.4.1.1.1)

‡

276

275

Delay from SWR or SCS high to SRDY high (see Note 21)

Delay from SWR high to SRDY high impedance

279

280

281

281a

Delay from SWR low to SDDIR low (see Note 21)

Delay from SWR high to SDDIR high (see note 21)

Hold of SDDIR low after SWR no longer active (see Note 21)

If SIF register is

ready (no waiting

required)

Delay from SDBEN low to SRDY low (see TMS380 Second Generation Token-Ring

User’s Guide, SPWU005, subsection 3.4.1.1.1)

282b

If SIF register is

not ready (waiting

required)

4000

282W Delay from SDDIR low to SDBEN low

283W Delay from SCS or SWR high to SDBEN no longer low

286

Pulse duration SWR high between DIO accesses (see Note 21)

†

‡

It is the later of SRD and SWR or SCS low that indicates the start of the cycle.

This specification has been characterized to meet stated value.

This specification is provided as an aid to board design.

NOTES: 21. The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

22. In 80x8x mode, SRAS may be used to strobe the values of SBHE, SRSX, SRS0–SRS2, and SCS. When used to do so, SRAS must

meet parameter 266a, and SBHE, SRS0–SRS2, and SCS must meet parameter 264. If SRAS is strapped high, then parameters

266a and 264 are irrelevant, and parameter 268 must be met.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

SCS, SRSX,

SRS0–SRS2,

SBHE

Valid

264

268

265

SRAS

SIACK

SWR

256

266a

267

273a

272a

273a

286

272a

SRD

273a

281

280

281a

(High)

SDDIR

282W

283W

†

SDBEN

279

276

275

SRDY

282b

255

HI-Z

263

262

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

HI-Z

Data

HI-Z

(see Note A)

†

When the TMS380C26 begins to drive SDBEN inactive, it has already latched the write data internally. Parameter 263 must be met to the input

of the data buffers.

NOTE A: In 8-bit 80x8x mode DIO writes, the value placed on SADH0–SADH7 is a don’t care.

Figure 29. 80x8x DIO Write Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x interrupt acknowledge timing – first SIACK pulse

NO.

286

PARAMETER

Pulse duration, SIACK high between DIO accesses (see Note 21)

Pulse duration, SIACK low on first pulse of two pulses

MIN

MAX

UNIT

287

62.5

NOTE 21: The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

SRD, SWR,

SCS

286

287

First

Second

SIACK

Figure 30. 80x8x Interrupt Acknowledge Timing – First SIACK Pulse

80x8x interrupt acknowledge timing – second SIACK pulse

NO.

PARAMETER

MIN

MAX

UNIT

255

Delay from SRDY low to SCS high

†

259

260

261

Hold of SAD high-impedance after SIACK low (see Note 21)

Setup of output data valid before SRDY low

†

Delay from SIACK high to SAD high-impedance (see Note 21)

Hold of output data valid after SIACK high (see Note 21)

Setup of inactive data strobe high to SIACK no longer high

Hold of inactive data strobe high after SIACK high

Delay from SIACK high to SRDY high (see Note 21)

261a

272a

273a

275

Delay from SRDY low in the first DIO access to the SIF register to SRDY low in the immediately

following access to the SIF

‡

276

279

4000

†

Delay from SIACK high to SRDY high impedance

Delay from SDBEN low to SRDY low in a read cycle

282a

282R

283R

Delay from SIACK low to SDBEN low (see TMS380 Second Generation Token-Ring

User’s Guide, SPWU005, subsection 3.4.1.1.1), provided previous cycle completed

Delay from SIACK high to SDBEN high (see Note 21)

†

‡

This specification is provided as an aid to board design.

This specification has been characterized to meet stated value.

NOTE 21: The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

SCS, SRSX,

SRS0–SRS2,

SBHE

Only SCS needs to be inactive.

All others are Don’t Care.

SIACK

SWR

273a

272a

SRD

273a

(High)

SDDIR

279

282R

283R

SDBEN

275

255

276

282a

†

SRDY

HI-Z

261

259

260

261a

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

HI-Z

Output Data Valid

HI-Z

(see Note A)

†

SRDY is an active-low bus ready signal. It must be asserted before data output.

NOTE A: In 8-bit 80x8x mode DIO writes, the value placed on SADH0–SADH7 is a don’t care.

Figure 31. 80x8x Interrupt Acknowledge Timing – Second SIACK Pulse

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x mode bus arbitration timing, SIF takes control

NO.

PARAMETER

MIN

MAX

UNIT

Setup of asynchronous signal SBBSY and SHLDA before SBCLK no longer high to guarantee

recognition on that cycle

208a

Hold of asynchronous signal SBBSY and SHLDA after SBCLK low to guarantee recognition on

that cycle

208b

212

Delay from SBCLK low to SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid

Delay from SBCLK low in cycle I2 to SOWN low

224a

224c

230

Delay from SBCLK low in cycle I2 to SDDIR low in DMA read

Delay from SBCLK high to SHRQ high

241

Delay from SBCLK high in TX cycle to SRD and SWR high, bus acquisition

Hold of SRD and SWR high-impedance after SOWN low, bus acquisition

†

241a

c(SCK)–15

†

This specification has been characterized to meet stated value.

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PARAMETER MEASUREMENT INFORMATION

User Master

Bus Exchange

SIF Master

(T4)

SIF Inputs:

SBCLK

208a

SBBSY,

SHLDA

208b

230

SIF Outputs:

SHRQ

241

SRD, SWR

SBHE

212

241a

212

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

Address Valid

224c

Write

Read

SDDIR

224a

SOWN

(see Note A)

NOTE A: While the system interface DMA controls are active (i.e., SOWN is asserted), the SCS input is disabled.

Figure 32. 80x8x Mode Bus Arbitration Timing, SIF Takes Control

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x mode DMA read timing

NO.

PARAMETER

MIN

MAX

UNIT

Setup of SADL0–SADL7, SADH0–SADH7, SPH, and SPL valid before SBCLK in T3 cycle no

longer high

205

Hold of SADL0–SADL7, SADH0–SADH7, SPH, and SPL valid after SBCLK low in T4 cycle if

parameters 207a and 207b not met

206

207a

207b

Hold of SADL0–SADL7, SADH0–SADH7, SPH, and SPL valid after SRD high

Hold of SADL0–SADL7, SADH0–SADH7, SPH, and SPL valid after SDBEN no longer low

Setup of asynchronous signal SRDY before SBCLK no longer high to guarantee recognition on

this cycle

208a

208b

212

Hold of asynchronous signal SRDY after SBCLK low to guarantee recognition on this cycle

Delay from SBCLK low to address valid

Delay from SBCLK low in T1 cycle to SADH0–SADH7, SADL0–SADL7, SPH, and SPL high-im-

pedance

†

214

215

216

Pulse duration, SALE and SXAL high

–25

–15

c(SCK)

Delay from SBCLK high to SALE or SXAL high

216a

217

Hold of SALE or SXAL low after SRD high

w(SCKL)

Delay from SBCLK high to SXAL low in the TX cycle or SALE low in the T1 cycle

Hold of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid after SALE or SXAL low

Delay from SBCLK low in T4 cycle to SRD high (see Note 23)

Delay from SBCLK low in T4 cycle to SDBEN high

218

w(SCKH)

223R

225R

†

226

Delay from SADH0–SADH7, SADL0–SADL7, SPH, and SPL high-impedance to SRD low

Delay from SBCLK low in T2 cycle to SRD low

227R

Hold of SADH0–SADH7, SADL0–SADL7, SPH, and SPL high-impedance after SBCLK low in

T1 cycle

†

229

231

233

–30

–15

Pulse duration, SRD low

c(SCK)

Setup of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid before SALE, SXAL no longer

high

w(SCKL)

237R

247

Delay from SBCLK high in the T2 cyle to SDBEN low

Setup of data valid before SRDY low if parameter 208a not met

†

This specification has been characterized to meet stated value.

NOTE 23: While the system interface DMA controls are active (i.e., SOWN is asserted), the SCS input is disabled.

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PARAMETER MEASUREMENT INFORMATION

TWAIT

SBCLK

SRAS

HI-Z

212

SBHE

(see Note B)

Valid

(High)

SWR

227R

223R

231

SRD

(see Note A)

215

217

218

216

217

215

SXAL

SALE

226

216

233

216a

212

207a

206

214

205

†

229

Address

233

Address

218

212

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

Data

Extended

Address

247

(see Note C)

218

207b

225R

208a

SRDY

208b

237R

SDBEN

(see Note A)

SDDIR

Low

†

If parameter 208A is not met then valid data must be present before SRDY goes low.

NOTES: A. Motorola-style bus slaves hold SDTACK active until the bus master deasserts SAS.

B. In 8-bit 80x8x mode, SBHE/SRNW is a don’t care input during DIO and an inactive (high) output during DMA.

C. In 8-bit 80x8x mode, the most significant byte of the address is maintained on SADH for T2, T3, and T4. The address is maintained according to parameter 21; i.e., held

after T4 high.

Figure 33. 80x8x Mode DMA Read Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x mode DMA write timing

NO.

PARAMETER

MIN

MAX

UNIT

Setup of asynchronous signal SRDY before SBCLK no longer high to guarantee recognition

on that cycle

208a

208b

212

Hold of asynchronous signal SRDY after SBCLK low to guarantee recognition on that cycle

Delay from SBCLK low to SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid

Pulse duration, SALE and SXAL high

215

–25

–15

c(SCK)

216

Delay from SBCLK high to SALE or SXAL high

216a

217

Hold of SALE or SXAL low after SWR high

w(SCKL)

Delay from SBCLK high to SXAL low in the TX cycle or SALE low in the T1 cycle

Hold of address valid after SALE, SXAL low

218

w(SCKH)

219

Delay from SBCLK low in T2 cycle to output data and parity valid

Hold of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid after SWR high

Delay from SBCLK low to SWR high

221

c(SCK)

223W

225W

Delay from SBCLK high in T4 cycle to SDBEN high

225WH Hold of SDBEN low after SWR, SUDS, and SLDS high

–25

w(SCKL)

227W

232

Delay from SBCLK low in T2 cycle to SWR low

Pulse duration, SWR low

c(SCK)

–30

–15

Setup of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid before SALE, SXAL

no longer high

233

w(SCKL)

237W

Delay from SBCLK high in T1 cycle to SDBEN low

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PARAMETER MEASUREMENT INFORMATION

TWAIT

SBCLK

212

SBHE

(see Note A)

Valid

(HIGH)

SRD

223W

227W

232

SWR

216

217

215

217

SXAL

SALE

216

215

216a

212

218

219

233

221

218

212

SADL0–SADH7,

SADH0–SADL7,

SPH, SPL

Address

Output Data

(see Note B)

Extended Address

208a

SRDY

225W

225WH

237W

208b

SDBEN

SDDIR

(HIGH)

NOTES: A. In 8-bit 80x8x mode, SBHE/SRNW is a don’t care input during DIO and an inactive (high) output during DMA.

B. In 8-bit 80x8x mode, the most significant byte of the address is maintained on SADH for T2, T3, and T4. The address is maintained according to parameter 21; i.e., held

after T4 high.

Figure 34. 80x8x Mode DMA Write Timing

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x mode bus arbitration timing, SIF returns control

NO.

PARAMETER

MIN

MAX

UNIT

Delay from SBCLK low in I1 cycle to SADH0–SADH7, SADL0–SADL7, SPL, SPH, SRD, and SWR

high-impedance

†

220

†

223b

224b

224d

230

Delay from SBCLK low in I1 cycle to SBHE high-impedance

Delay from SBCLK low in cycle I2 to SOWN high

Delay from SBCLK low in cycle I2 to SDDIR high

Delay from SBCLK high in cycle I1 to SHRQ low

†

240

Setup of SRD, SWR, and SBHE high-impedance before SOWN no longer low

†

This specification has been characterized to meet stated value.

SIF Master

Bus Exchange

User Master

(T1)

(T2)

SBCLK

SHLDA

SIF Outputs:

230

SHRQ

(see Note A)

220

240

SRD, SWR

HI-Z

223b

SBHE

SIF

HI-Z

240

220

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

224d

224b

WRITE

READ

SDDIR

SOWN

(see Note B)

NOTES: A. In 80x8x mode, the system interface deasserts SHRQ on the rising edge of SBCLK following the T4 state of the last system bus

transfer it controls. In 68xxx mode, the system interface deasserts SBRQ on the rising edge of SBCLK in state T2 of the first system

bus transfer it controls.

B. While the system interface DMA controls are active (i.e., SOWN is asserted), the SCS input is disabled.

Figure 35. 80x8x Mode Bus Arbitration Timing, SIF Returns Control

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TMS380C26

NETWORK COMMPROCESSOR

SPWS010A–APRIL1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

80x8x mode bus release timing

NO.

PARAMETER

MIN

MAX

UNIT

208a Setup of asynchronous input SBRLS low before SBCLK no longer high to guarantee recognition

208b Hold of asynchronous input SBRLS low after SBCLK low to guarantee recognition

208c Hold of SBRLS low after SOWN high

T(W or 2)

208a

SBCLK

208b

SBRLS

(see Note A)

SOWN

208c

NOTES: A. The System Interface ignores the assertion of SBRLS if it does not own the system bus. If it does own the bus, then when it detects

the assertion of SBRLS, it will complete any internally started DMA cycle and relinquish control of the bus. If no DMA transfer has

internally started, then the System Interface will release the bus before starting another.

B. If SBERR is asserted when the System Interface controls the system bus, then the current bus transfer is completed, regardless

of the value of SRDY. If the BERETRY register is non-zero, the cycle will be retried. If the BERETRY register is zero, the System

Interface will then release control of the system bus. The System Interface ignores the assertion of SBERR if it is not performing

a DMA bus cycle on the system bus. When SBERR is properly asserted and BERETRY is zero, however, the System Interface

releases the bus upon completion of the current bus transfer and halts all further DMA on the system side. The error is synchronized

to the local bus and DMA stops on the local sides. The value of the SDMAADR, SDMADDRX, and SDMALEN registers in the System

Interface are not defined after a system bus error.

C. In cycle-steal mode, state TX is present on every system bus transfer. In burst mode, state TX is present on the first bus transfer

and whenever the increment of the DMA Address Register carries beyond the least significant 16 bits.

D. SDTACK is not sampled to verify that it is deasserted.

E. Unless otherwise specified, for all signals specified as a maximum delay from the end of an SBCLK transition to the signal valid,

the signal is also specified to hold its previous value (including high-impedance) until the start of that SBCLK transition.

Figure 36. 80x8x Mode Bus Release Timing

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NETWORK COMMPROCESSOR

SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx DIO read timing

NO.

PARAMETER

MIN

MAX

UNIT

255

259

260

Delay from SDTACK low to either SCS, SUDS, or SLDS high

†

Hold of SAD high-impedance after SUDS or SLDS low (see Note 21)

Setup of SADH0–SADH7, SADL0–SADL7, SPH, and SPL valid before SDTACK low

Delay from SCS, SUDS, or SLDS high to SADH0–SADH7, SADL0–SADL7, SPH, and SPL

high-impedance (see Note 21)

†

261

261a

267

268

272

273

273a

275

Hold of output data valid after SUDS or SLDS no longer low (see Note 21)

Setup of register address before SUDS or SLDS no longer high (see Note 21)

Hold of register address valid after SUDS or SLDS no longer low (see Note 22)

Setup of SRNW before SUDS or SLDS no longer high (see Note 21)

Hold of SRNW after SUDS or SLDS high

Hold of SIACK high after SUDS or SLDS high

Delay from SCS, SUDS, or SLDS high to SDTACK high (see Note 21)

Delay from SDTACK low in the first DIO access to the SIF register to SDTACK low in the immediately fol-

lowing access to the SIF

‡

276

279

4000

†

Delay from SUDS or SLDS high to SDTACK high impedance

Delay from SDBEN low to SDTACK low

282a

Delay from SUDS or SLDS low to SDBEN low (see TMS380 Second Generation Token-Ring User’s

Guide, SPWU005, subsection 3.4.1.1.1) provided the previous cycle completed

282R

283R

286

Delay from SUDS or SLDS high to SDBEN high (see Note 21)

Pulse duration, SUDS or SLDS high between DIO accesses (see Note 21)

†

‡

This specification is provided as an aid to board design.

This specification has been characterized to meet stated value.

NOTES: 21. The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

22. In 80x8x mode, SRAS may be used to strobe the values of SBHE, SRSX, SRS0–SRS2, and SCS. When used to do so, SRAS must

meet parameter 266a, and SBHE, SRS0–SRS2, and SCS must meet parameter 264. If SRAS is strapped high, then parameters

266a and 264 are irrelevant, and parameter 268 must be met.

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SPWS010A–APRIL1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

SCS, SRSX,

SRS0, SRS1

Valid

267

268

SIACK

SRNW

273a

272

273

SUDS,

SLDS

286

SDDIR

(High)

279

282R

283R

275

SDBEN

276

282a

255

†

HI-Z

SDTACK

261

261a

259

260

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

HI-Z

Output Data Valid

†

SDTACK is an active-low bus ready signal. It must be asserted before data output.

Figure 37. 68xxx DIO Read Timing

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SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx DIO write timing

NO.

PARAMETER

MIN

MAX

UNIT

255

262

263

267

268

272

Delay from SDTACK low to either SCS, SUDS or SLDS high

Setup of write data valid before SUDS or SLDS no longer low

Hold of write data valid after SUDS or SLDS high

Setup of register address before SUDS or SLDS no longer high (see Note 21)

Hold of register address valid after SUDS or SLDS no longer low (see Note 22)

Setup of SRNW before SUDS or SLDS no longer high (see Note 21)

Setup of inactive SUDS or SLDS high to active data strobe no longer high

Hold of SRNW after SUDS or SLDS high

272a

273

273a

275

Hold of inactive SUDS or SLDS high after active data strobe high

Delay from SCS, SUDS or SLDS high to SDTACK high (see Note 21)

Delay from SDTACK low in the first DIO access to the SIF register to SDTACK low in the

immediately following access to the SIF

‡

†

276

4000

279

280

281

Delay from SUDS or SLDS high to SDTACK high impedance

Delay from SUDS or SLDS low to SDDIR low (see Note 21)

Delay from SUDS or SLDS high to SDDIR high (see Note 21)

Hold of SDDIR low after SUDS or SLDS no longer active (see Note 21)

281a

If SIF register is

ready (no waiting

required)

Delay from SDBEN low to SDTACK low (see TMS380 Second Generation Token-

Ring User’s Guide, SPWU005, subsection 3.4.1.1.1)

282b

If SIF register is

not ready (waiting

required)

4000

282W

283W

286

Delay from SDDIR low to SDBEN low

Delay from SUDS or SLDS high to SDBEN no longer low

Pulse duration, SUDS or SLDS high between DIO accesses (see Note 21)

†

‡

This specification is provided as an aid to board design.

This specification has been characterized to meet stated value.

It is the later of SRD and SWR or SCS low that indicates the start of the cycle.

NOTES: 21. The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

22. In 80x8x mode, SRAS may be used to strobe the values of SBHE, SRSX, SRS0–SRS2, and SCS. When used to do so, SRAS must

meet parameter 266a, and SBHE, SRS0–SRS2, and SCS must meet parameter 264. If SRAS is strapped high, then parameters

266a and 264 are irrelevant, and parameter 268 must be met.

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SPWS010A–APRIL1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

SCS SRSX,

SRS0, SRS1

Valid

267

268

SIACK

SRNW

273a

272

273

286

272a

SUDS,

SLDS

(see Note A)

273a

281

281a

280

SDDIR

(High)

282W

283W

‡

SDBEN

279

276

275

255

†

HI-Z

SDTACK

263

(see Note 36)

282b

262

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

Data

†

‡

SDTACK is an active-low bus ready signal. It must be asserted before data output.

When the TMS380C16 begins to drive SDBEN inactive, it has already latched the write date internally. Parameter 263 must be met to the input

of the data buffers.

NOTE A: For 68xxx mode, skew between SLDS and SUDS must not exceed 10 ns. Provided this limitation is observed, all events referenced

to a data strobe edge use the later occurring edge. Events defined by two data strobes edges, such as parameter 286, are measured

between latest and earlier edges.

Figure 38. 68xxx DIO Write Timing

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SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx interrupt acknowledge cycle timing

NO.

PARAMETER

Delay from SDTACK low to either SCS or SUDS, or SIACK high

Hold of SAD high-impedance after SIACK no longer high (see Note 21)

Setup of output data valid before SDTACK no longer high

MIN

MAX

UNIT

255

†

259

260

261

†

Delay from SIACK high to SAD high-impedance (see Note 21)

Hold of output data valid after SCS or SIACK no longer low (see Note 21)

Setup of register address before SIACK no longer high (see Note 21)

Setup of inactive high SIACK to active data strobe no longer high

Hold of inactive SRNW high after active data strobe high

261a

267

272a

273a

275

Delay from SCS or SRNW high to SDTACK high (see Note 21)

Delay from SDTACK low in the first DIO access to the SIF register to SDTACK low in the immediately

following access to the SIF

‡

276

4000

†

279

Delay from SIACK high to SDTACK high impedance

Delay from SDBEN low to SDTACK low in a read cycle

282a

282R

Delay from SIACK low to SDBEN low (see TMS380 Second Generation Token-Ring User’s Guide,

SPWU005, subsection 3.4.1.1.1) provided the previous cycle completed

283R

286

Delay from SIACK high to SDBEN high (see Note 21)

Pulse duration, SIACK high between DIO accesses (see Note 21)

†

‡

This specification is provided as an aid to board design.

This specification has been characterized to meet stated value.

It is the later of SRD and SRD or SCS low that indicates the start of the cycle.

NOTE 21: The “inactive” chip select is SIACK in DIO read and DIO write cycles, and SCS is the “inactive” chip select in interrupt acknowledge

cycles.

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SPWS010A–APRIL1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

SCS, SRSX,

SRS0, SRS1,

SBHE

Only SCS needs to be Inactive.

All Others are Don’t Care.

267

SIACK

SRNW

272a

286

273a

286

SLDS

(High)

SDDIR

279

282R

283R

SDBEN

275

255

276

282a

HI-Z

259

HI-Z

†

SDTACK

261

260

261a

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

HI-Z

Output Data Valid

(see Note A)

†

SDTACK is an active-low bus ready signal. It must be asserted before data output.

NOTE A: Internal logic will drive SDTACK high and verify that it has reached a valid high level before three-stating the signal.

Figure 39. 68xxx Interrupt Acknowledge Cycle Timing

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SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx mode bus arbitration timing, SIF takes control

NO.

PARAMETER

MIN

MAX

UNIT

Setup of asynchronous input SBGR before SBCLK no longer high to guarantee recognition on

this cycle

208a

208b

212

Hold of asynchronous input SBGR after SBCLK low to guarantee recognition on this cycle

Delay from SBCLK low to address valid

224a

224c

230

Delay from SBCLK low in cycle I2 to SOWN low (see Note 24)

Delay from SBCLK low in cycle I2 to SDDIR low in DMA read

Delay from SBCLK high to either SHRQ low or SBRQ high

241

Delay from SBCLK high in TX cycle to SUDS and SLDS high

Hold of SUDS, SLDS, SRNW, and SAS high-impedance after SOWN low, bus acquisition

†

241a

c(SCK)–15

†

This specification has been characterized to meet stated value.

NOTE 24: Motorola-style bus slaves hold SDTACK active until the bus master deasserts SAS.

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PARAMETER MEASUREMENT INFORMATION

User Master

SIF Inputs:

Bus Exchange

SIF Master

(T4)

SBCLK

208b

208a

SBGR

SBERR,

SDTACK,

SBBSY

230

SIF Outputs:

230

SBRQ

(see Note A)

208a

208b

241

SAS, SLDS,

SUDS

Output

(Input)

241

READ

SRNW

WRITE

212

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

HI-Z

SIF

224c

WRITE

READ

SDDIR

224a

241a

SOWN

(see Note B)

NOTES: A. In 80x8x mode, the system interface deasserts SHRQ on the rising edge of SBCLK following the T4 state of the last system bus transfer it controls. In 68xxx mode, the

system interface deasserts SBRQ on the rising edge of SBCLK in state T2 of the first system bus transfer it controls.

B. While the system interface DMA controls are active (i.e., SOWN is asserted), the SCS input is disabled.

Figure 40. 68xxx Mode Bus Arbitration Timing, SIF Takes Control

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SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx mode DMA read timing

NO.

205

PARAMETER

MIN

MAX

UNIT

Setup of input data valid before SBCLK in T3 cycle no longer high

Hold of input data valid after SBCLK low in T4 cycle if parameters 207a and 207b not met

Hold of input data valid after data strobe no longer low

206

207a

207b

Hold of input data valid after SDBEN no longer low

Setup of asynchronous input SDTACK before SBCLK no longer high to guarantee recognition

on this cycle

208a

208b

209

Hold of asynchronous input SDTACK after SBCLK low to guarantee recognition on this cycle

Pulse duration, SAS, SUDS, and SLDS high

c(SCK)

–25

w(SCKL)

210

212

Delay from SBCLK high in T2 cycle to SUDS and SLDS active

Delay from SBCLK low to address valid

†

214

215

216

Delay from SBCLK low in T2 cycle to SAD high-impedance

Pulse duration, SALE and SXAL high

–25

–15

c(SCK)

Delay from SBCLK high to SALE or SXAL high

216a

217

Hold of SALE or SXAL low after SUDS and SAS high

Delay from SBCLK high to SXAL low in the TX cycle or SALE low in the T1 cycle

Hold of address valid after SALE, SXAL low

w(SCKL)

218

w(SCKH)

222

Delay from SBCLK high to SAS low

223R

225R

Delay from SBCLK low in T4 cycle to SUDS, SLDS, and SAS high (see Note 25)

Delay from SBCLK low in T4 cycle to SDBEN high

Hold of SAD high-impedance after SBCLK low in T4 cycle

Setup of address valid before SALE or SXAL no longer high

Setup of address valid before SAS no longer high

Delay from SBCLK high in the T2 cycle to SDBEN low

†

229

–15

233

w(SCKL)

233a

237R

–30

c(SCK)

239

Pulse duration, SAS, SUDS, and SLDS

w(SCKH)

247

Setup of data valid before SDTACK low if parameter 208a not met

†

This specification has been characterized to meet stated value.

NOTE 25: While the system interface DMA controls are active (i.e., SOWN is asserted), the SCS input is disabled.

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PARAMETER MEASUREMENT INFORMATION

TWAIT

SBCLK

222

239

SAS

(see Note A)

209

223R

210

239

SUDS,

SLDS

218

217

(High)

216

217

SRNW

SXAL

215

216

218

216a

215

SALE

229

212

233a

233

212

206

205

233

214

207a

SADL0–SADH7,

SADH0–SADL7,

SPH, SPL

Address

Data In

HI-Z

Extended Address

†

247

207b

208a

SDTACK

(see Notes B and C)

208b

SDDIR

225R

237R

SDBEN

(see Note A)

†

If parameter 208a is not met, then valid data must be present before SDTACK goes low.

NOTES: A. Motorola-style bus slaves hold SDTACK active until the bus master deasserts SAS.

B. All V pins should be routed to minimize inductance to system ground.

C. On read cycle, read strobe remains active until the internal sample of incoming data is completed. Input-data may be removed when either the read strobe or SDBEN

becomes no longer active.

Figure 41. 68xxx Mode DMA Read Timing

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SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx mode DMA write timing

NO.

208a

208b

209

PARAMETER

MIN

MAX

UNIT

Setup of asynchronous input SDTACK before SBCLK no longer high to guarantee recognition

on this cycle

Hold of asynchronous input SDTACK after SBCLK low to guarantee recognition on this cycle

Pulse duration, SAS, SUDS, and SLDS high

c(SCK)

–25

–15

–25

–15

w(SCKL)

211

Delay from SBCLK high in T2 cycle to SUDS and SLDS active

Delay of output data valid to SUDS and SLDS no longer high

Delay from SBCLK low to address valid

211a

212

w(SCKL)

215

Pulse duration, SALE and SXAL high

c(SCK)

216

Delay from SBCLK high to SALE or SXAL high

216a

217

Hold of SALE or SXAL low after SUDS and SAS high

Delay from SBCLK high to SXAL low in the TX cycle or SALE low in the T1 cycle

Hold of address valid after SALE, SXAL low

w(SCKL)

218

w(SCKH)

219

Delay from SBCLK low in T2 cycle to output data and parity valid

Hold of output data, parity valid after SUDS and SLDS high

Delay from SBCLK high to SAS low

221

c(SCK)

222

223W

225W

Delay from SBCLK low to SUDS, SLDS, and SAS high

Delay from SBCLK high in T4 cycle to SDBEN high

225WH Hold of SDBEN low after SUDS and SLDS high

–25

–15

w(SCKL)

233

Setup of address valid before SALE or SXAL no longer high

Setup of address valid before SAS no longer high

Delay from SBCLK high in T1 cycle to SDBEN low

233a

237W

c(SCK)

w(SCKH)

–30

239

243

SAS pulse duration

c(SCK)

Pulse duration, SUDS and SLDS

–25

w(SCKH)

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PARAMETER MEASUREMENT INFORMATION

TWAIT

SBCLK

SAS

222

211

223W

239

209

233a

243

SUDS,

SLDS

218

216

211a

217

SRNW

Low

217

218

215

216

SXAL

SALE

216a

215

212

233

221

233

219

SADL0–SADH7,

SADH0–SADL7,

SPL, SPH

Address

Output Data

208a

Extended Address

SDTACK

(see Notes A and B)

208b

225W

225WH

SDDIR

237W

SDBEN

NOTES: A. All V

pins should be routed to minimize inductance to system ground.

B. On read cycle, read strobe remains active until the internal sample of incoming data is completed. Input-data may be removed when either the read strobe or SDBEN

becomes no longer active.

Figure 42. 68xxx Mode DMA Write Timing

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SPWS010A–APRIL 1992–REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

68xxx mode bus arbitration timing, SIF returns control

NO.

PARAMETER

MIN

MAX

UNIT

†

220

Delay from SBCLK low in I1 cycle to SAD, SPL, SPH, SUDS, and SLDS high-impedance, bus release

Delay from SBCLK low in I1 cycle to SBHE/SRNW high-impedance

Delay from SBCLK low in cycle I2 to SOWN high

†

223b

224b

224d

230

Delay from SBCLK low in cycle I2 to SDDIR high

Delay from SBCLK high to either SHRQ low or SBRQ high

†

240

Setup of SUDS, SLDS, SRNW, and SAS control signals high-impedance before SOWN no longer low

†

This specification has been characterized to meet stated value.

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PARAMETER MEASUREMENT INFORMATION

SIF Master

Bus Exchange

User

SIF Inputs:

SBCLK

SBGR

SDTACK

SIF Outputs:

230

SBRQ

(see Note A)

220

240

SAS, SUDS,

SLDS

240

223b

READ

HI-Z

SRNW

WRITE

SIF

220

SADH0–SADH7,

SADL0–SADL7,

SPH, SPL

HI-Z

224d

224b

WRITE

READ

SDDIR

SOWN

NOTE A: In 80x8x mode, the system interface deasserts SHRQ on the rising edge of SBCLK following the T4 state of the last system bus transfer it controls. In 68xxx mode, the system

interface deasserts SBRQ on the rising edge of SBCLK in state T2 of the first system bus transfer it controls.

Figure 43. 68xxx Mode Bus Arbitration Timing, SIF Returns Control

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PARAMETER MEASUREMENT INFORMATION

68xxx mode bus release and error timing

NO.

PARAMETER

MIN

MAX

UNIT

208a Setup of asynchronous input before SBCLK no longer high to guarantee recognition

208b Hold of asynchronous input SBRLS, SOWN, or SBERR after SBCLK low to guarantee recognition

208c Hold of SBRLS low after SOWN high

236

Setup of SBERR low before SDTACK no longer high if parameter 208a not met

T(W or 2)

208a

SBCLK

SBRLS

208b

(see Note A)

208b

SOWN

208c

208a

SBERR

(see Note B)

236

SDTACK

NOTES: A. The System Interface ignores the assertion of SBRLS if it does not own the system bus. If it does own the bus, then when it detects

the assertion of SBRLS, it will complete any internally started DMA cycle and relinquish control of the bus. If no DMA transfer has

internally started, then the System Interface will release the bus before starting another.

B. If SBERR is asserted when the System Interface controls the system bus, then the current bus transfer is completed, regardless

of the value of SDTACK. If the BERETRY register is non-zero, the cycle will be retried. If the BERETRY register is zero, the System

Interface will then release control of the system bus. The System Interface ignores the assertion of SBERR if it is not performing

a DMA bus cycle on the system bus. When SBERR is properly asserted and BERETRY is zero, however, the System Interface

releases the bus upon completion of the current bus transfer and halts all further DMA on the system side. The error is synchronized

to the local bus and DMA stops on the local sides. The value of the SDMAADR, SDMADDRX, and SDMALEN registers in the System

Interface are not defined after a system bus error.

C. In cycle-steal mode, state TX is present on every system bus transfer. In burst mode, state TX is present on the first bus transfer

and whenever the increment of the DMA Address Register carries beyond the least significant 16 bits.

D. SDTACK is not sampled to verify that it is deasserted.

E. Unless otherwise specified, for all signals specified as a maximum delay from the end of an SBCLK transition to the signal valid,

the signal is also specified to hold its previous value (including high-impedance) until the start of that SBCLK transition.

Figure 44. 68xxx Mode Bus Release and Error Timing

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PARAMETER MEASUREMENT INFORMATION

†

normal completion with delayed start

T(W or 2)

SBCLK

SDTACK

SBERR

SHALT

†

rerun cycle with delayed start

SBCLK

SDTACK

SBERR

SHALT

SOWN

†

Only the relative placement of the edges to SBCLK falling edge is shown. Actual signal edge placement may vary from waveforms shown.

Figure 45. 68xxx Bus Halt and Retry Cycle Waveforms

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MECHANICAL DATA

JEDEC plastic leaded quad flat package (PQ suffix)

Each of these chip carrier packages consists of a circuit mounted on a lead frame and encapsulated within an

electrically nonconductive plastic compound. The compound withstands soldering temperatures with no

deformation, and circuit performance characteristics remain stable when the devices are operated in

high-humidity conditions. The packages are intended for surface mounting on solder lands on 0,635 (0.025)

centers. Leads require no additional cleaning or processing when used in soldered assembly.

4,57 (0.180)

0,254 (0.010) NOM

0,635 (0.025) NOM

4,06 (0.160)

0,76 (0.030) NOM

JEDEC

NO. OF

OUTLINE

TERMINALS

MIN

MAX

MIN

18,97

MAX

MIN

15,16

MAX

22,28

22,43

19,13

15,32

(0.603)

100

132

MO–069–AD

MO–069–AE

(0.877) (0.883) (0.747) (0.753) (0.597)

27,36 27,50 24,05 24,21 20,24

(1.077) (1.083) (0.947) (0.953) (0.797)

20,40

(0.803)

ALL LINEAR DIMENSIONS ARE IN MILLIMETERS AND PARENTHETICALLY IN INCHES

POST OFFICE BOX 1443 • HOUSTON, TEXAS

77251–1443

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any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

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BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

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