SMSC Switch USB2512i User Manual

USB2512i

Industrial Temperature

Rated USB 2.0 High-Speed

2-Port Hub Controller

Datasheet

PRODUCT FEATURES

„

Programmable USB signal drive strength. Recover

USB signal integrity due to compromised system

environment using 2-level driving strength resolution

Select the presence of a permanently hardwired USB

peripheral device on a port by port basis

Configure the delay time for filtering the over-current

sense inputs

Configure the delay time for turning on downstream

port power

Indicate the maximum current that the 2-port hub

consumes from the USB upstream port

Indicate the maximum current required for the hub

controller

General Description

The SMSC 2-Port Hub is a low power, OEM

configurable, STT (Single transaction translator) hub

controller IC with 2 downstream ports for embedded

USB solutions. The 2-port hub is fully compliant with the

USB 2.0 Specification and will attach to an upstream

port as a Full-Speed Hub or as a Full-/High-Speed Hub.

The 2-Port Hub supports Low-Speed, Full- Speed, and

High-Speed (if operating as a High-Speed Hub)

downstream devices on all of the enabled downstream

ports.

„

General Features

Pin Selectable Options for Default Configuration

„

Hub Controller IC with 2 downstream ports

Enhanced OEM configuration options available

—

Select Downstream Ports as Non-Removable Ports

„

through either a single serial I C EEPROM, or

Applications

SMBus Slave Port

„

LCD monitors and TVs

Multi-function USB peripherals

PC mother boards

Set-top boxes, DVD players, DVR/PVR

Printers and scanners

PC media drive bay

Portable hub boxes

Mobile PC docking

Embedded systems

„

36-pin (6x6mm) QFN lead-free, RoHS compliant

package

Supports industrial temperature range of -40ºC - 85ºC

Hardware Features

„

Low power operation

„

Full Power Management with individual or ganged

power control of each downstream port

On-chip Power On Reset (POR)

Internal 1.8V Voltage Regulator

Fully integrated USB termination and Pull-up/Pull-

down resistors

„

On Board 24MHz Crystal Driver, Resonator or

External 24MHz clock input

Enhanced EMI rejection and ESD protection

performance

OEM Selectable Features

„

Customize Vendor ID, Product ID, and Device ID

Select whether the hub is part of a compound device

(When any downstream port is permanently

hardwired to a USB peripheral device, the hub is part

of a compound device)

„

Flexible port mapping and disable sequence. Ports

can be disabled/reordered in any order to support

multiple product SKUs. Hub will automatically reorder

the remaining ports to match the Host controller's

numbering scheme.

Programmable USB differential-pair pin location.

Ease PCB layout by aligning USB signal lines directly

to connectors

SMSC USB2512i

DATASHEET

Revision 1.92 (11-28-07)

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

Table of Contents

Chapter 1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 3 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1

3.2

PIN Description s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Chapter 4 Configuration Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1

2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1.1

4.1.2

Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2

EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2.1

4.2.2

4.2.3

Internal Register Set (Common to EEPROM and SMBus) . . . . . . . . . . . . . . . . . . . . . . . 13

I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.3

SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Bus Reset Sequenc e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 7

SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.4

4.5

4.6

Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.6.1

4.6.2

4.6.3

Internal POR Hardware Rese t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 7

External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 5 DC Parameter s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2

5.1

5.2

Maximum Guaranteed Rating s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2

Chapter 6 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.1

Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.1.1

6.1.2

6.1.3

SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Chapter 7 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

SMSC USB2512i

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

List of Figures

Figure 1.1 USB2512i 36-Pin QFN (Embedded Footprint ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2.1 USB2512i Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4.1 Block Writ e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6

Figure 4.2 Block Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 4.3 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 4.4 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 4.5 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 6.1 Typical Crystal Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 6.2 Formula to find value of C1 and C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 7.1 36-Pin QFN, 6x6mm Body, 0.5mm Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

List of Tables

Table 3.1 USB2512i Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3.3 USB2512i Power, Ground, and No Connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 3.4 USB2512i Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map. . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4.2 Port Remap Register for Ports 1 & 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 4.3 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 4.4 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 4.5 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 5.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 5.2 Pin Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

SMSC USB2512i

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

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Chapter 1 Pin Configuration

SUSP_IND/LOCAL_PWR/NON_REM0

VDDA33

USBUP_DM

USBUP_DP

XTAL2

OCS2_N

PRTPWR2

VDD33CR

VDD18

SMSC

USB2512i

Embedded Footprint

(Top View QFN-36)

XTAL1/CLKIN

VDD18PLL

RBIAS

OCS1_N

PRTPWR1

TEST

Thermal Slug

(must be connected to VSS)

VDD33PLL

VDDA33

Indicates pins on the bottom of the device.

Figure 1.1 USB2512i 36-Pin QFN (Embedded Footprint)

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

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Chapter 2 Block Diagram

To Upstream

V_BUS

Upstream USB

Data

To EEPROM or

SMBus Master

24 MHz Crystal

SCK

3.3V

1.8V

PLL

Serial

Bus-Power

Detect/V_BUS

Pulse

Interface

Upstream

PHY

1.8V Reg

SIE

Controller

Repeater

Port

Controller

Routing & Port Re-Ordering Logic

Port #1

Port #2

Sense

Switch

Driver

LED

PHY#1

PHY#2

Switch

Driver

LED

Drivers

OC Sense

Switch/LED

Drivers

OC Sense

Switch/LED

Drivers

USB Data

Downstream

USB Data

Downstream

Figure 2.1 USB2512i Block Diagram

SMSC USB2512i

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

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Chapter 3 Pin Descriptions

3.1

PIN Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional

groups according to their associated interface.

The “N” symbol in the signal name indicates that the active, or asserted, state occurs when the signal

is at a low voltage level. When “N” is not present before the signal name, the signal is asserted when

at the high voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working

with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a

signal is active, independent of whether that level is represented by a high or low voltage. The term

negate, or negation, indicates that a signal is inactive.

Table 3.1 USB2512i Pin Descriptions

QFN-36

EMB

BUFFER

TYPE

SYMBOL

DESCRIPTION

UPSTREAM USB INTERFACES

USBUP_DP

USBUP_DM

IO-U

USB Bus Data

These pins connect to the upstream USB bus data signals

(Host port, or upstream hub).

VBUS_DET

I/O12

Detect Upstream VBUS Power

Detects state of Upstream VBUS power. The SMSC Hub

monitors VBUS_DET to determine when to assert the internal

D+ pull-up resistor (signaling a connect event).

When designing a detachable hub, this pin must be connected

to the VBUS power pin of the USB port that is upstream of the

hub.

For self-powered applications with a permanently attached

host, this pin must be connected to 3.3V (typically VDD33).

DOWNSTREAM 2-PORT USB 2.0 INTERFACE

USBDN_DP[2:1]/

IO-U

High-Speed USB Data

These pins connect to the downstream USB peripheral devices

attached to the hub’s port.

USBDN_DM[2:1]/

PRTPWR[2:1]

O12

IPU

I-R

USB Power Enable

Enables power to USB peripheral devices downstream.

Note: The hub supports active high power controllers only!

Over Current Sense

OCS[2:1]_N

Input from external current monitor indicating an over-current

condition.

{Note: Contains internal pull-up to 3.3V supply}

RBIAS

USB Transceiver Bias

^{A 12.0k}Ω (+/- 1%) resistor is attached from ground to this pin

to set the transceiver’s internal bias settings.

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller

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Table 3.1 USB2512i Pin Descriptions (continued)

QFN-36

EMB

BUFFER

TYPE

SYMBOL

DESCRIPTION

SERIAL PORT INTERFACE

SDA/

I/OSD12

Serial Data / SMB Data & Port Non Removable Strap Option

SMBDATA/

NON_REM1

NON_REM1: Non removable port strap

option.

If this strap is enabled by package and configuration settings

(see T a ble 3.2), this pin will be sampled (in conjunction

with LOCAL_PWR/SUSP_IND/NON_REM0) at RESET_N

negation to determine if imports [2:1] contain permanently

attached

(non-removable) devices:

NON_REM[1:0] = ‘00’, All ports are removable.

NON_REM[1:0] = ‘01’, Port 1 is nonremovable.

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable.

NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable.

Serial Clock (SCL)

SCL/

I/OSD12

SMBus Clock (SMBCLK)

SMBCLK/

CFG_SEL0

Configuration Select_SEL0: The logic state of this multifunction

pin is internally latched on the rising edge of RESET_N

(RESET_N negation), and will determine the hub configuration

method as described in T a ble 3.2, "SMBus or EEPROM

Interface Behavior".

HS_IND/

CFG_SEL1

I/O12

High-Speed Upstream port indictor & Configuration

Programming Select

HS_IND: High Speed Indicator for upstream port connection

speed.

The active state of the LED will be determined as follows:

CFG_SEL1 = ‘0’,

HS_IND is active high,

CFG_SEL1 = ‘1’,

HS_IND is active low,

‘Asserted’ = Hub is connected at HS

‘Negated’ = Hub is connected at FS

CFG_SEL1: The logic state of this pin is internally latched on

the rising edge of RESET_N (RESET_N negation), and will

determine the hub configuration method as described in

T a ble 3.2, "SMBus or EEPROM Interface Behavior".

MISC

XTAL1/

CLKIN

ICLKx

Crystal Input/External Clock Input

24MHz crystal or external clock input.

This pin connects to either one terminal of the crystal or to an

external 24MHz clock when a crystal is not used.

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Table 3.1 USB2512i Pin Descriptions (continued)

QFN-36

EMB

BUFFER

TYPE

SYMBOL

DESCRIPTION

XTAL2

OCLKx

Crystal Output

24MHz Crystal

This is the other terminal of the crystal, or a NO-CONNECT

when an external clock source is used to drive XTAL1/CLKIN.

This output must not be used to drive any external circuitry

other than the crystal circuit.

RESET_N

RESET Input

The system can reset the chip by driving this input low. The

minimum active low pulse is 1 us.

When the RESET_N pin is pulled to VDD33, the internal POR

(Power on Reset) is enabled and no external reset circuitry is

required. The internal POR holds the internal logic in reset until

the power supplies are stable.

SUSP_IND/

LOCAL_PWR/

NON_REM0

I/O

Active/Suspend status LED or Local-Power & Non Removable

Strap Option

Suspend Indicator: Indicates USB state of the hub.

‘negated’ = Unconfigured, or configured and in USB Suspend

‘asserted’ = Hub is configured, and is active (i.e., not in

suspend)

Local Power: Detects availability of local self-power source.

Low = Self/local power source is NOT available (i.e., Hub gets

all power from Upstream USB VBus).

High = Self/local power source is available.

NON_REM0 Strap Option:

If this strap is enabled by package and configuration settings

(see T a ble 3.2), this pin will be sampled (in conjunction with

NON_REM1) at RESET_N negation to determine if ports [2:1]

contain permanently attached (non-removable) devices. Also,

the active state of the LED

will be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable, and the LED is

active high

NON_REM[1:0] = ‘01’, Port 1 is nonremovable, and the LED is

active low

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable, and the

LED is active high

NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable, and the

LED is active low

TEST

IPD

TEST pin

Used for testing the chip. User must treat as a no-connect or

connect to ground.

Table 3.2 SMBus or EEPROM Interface Behavior

CFG_SEL0 SMBUS OR EEPROM INTERFACE BEHAVIOR

Internal Default Configuration

CFG_SEL1

„

Strap Options Enabled

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Table 3.2 SMBus or EEPROM Interface Behavior (continued)

CFG_SEL1

CFG_SEL0

SMBUS OR EEPROM INTERFACE BEHAVIOR

Configured as an SMBus slave for external download of user-defined

descriptors.

„

SMBus slave address 58 (0101100x)

Strap Options Disabled

All Settings Controlled by Registers

Internal Default Configuration

„

Strap Options Enabled

„

Bus Power Operation

2-Wire I2C EEPROMS are supported.

„

Strap Options Disabled

„

All Settings Controlled by Registers

Table 3.3 USB2512i Power, Ground, and No Connect

PACKAGE SYMBOL 36-QFN EMB FUNCTION

VDD18

VDD Core

This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to

VSS.

VDD33PLL

VDD 3.3 PLL Regulator Reference

+3.3V power supply for the PLL. If the internal PLL 1.8V regulator

is enabled, then this pin acts as the regulator input.

VDDPLL18

VDD PLL

This pin must have a 1.0μF (or greater) ±20% (ESR <0.1Ω) capacitor to

VSS.

VDDA33

VDD Analog I/O

+3.3V Filtered analog PHY power, shared between adjacent ports.

VDD33/VDD33CR

VDDIO/VDD 3.3 Core Regulator Reference

+3.3V power supply for the Digital I/O

If the internal core regulator is enabled, then VDD33CR acts as the

regulator input.

No Connect

Leave unconnected on the circuit board.

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3.2

Buffer Type Descriptions

Table 3.4 USB2512i Buffer Type Descriptions

DESCRIPTION

BUFFER

IPD

Input.

Input with internal weak pull-down resistor.

Input with internal weak pull-up resistor.

Input with Schmitt trigger.

IPU

O12

Output 12mA.

OD12

I/O12

I/OSD12

Open drain... 12mA sink.

Input/Output buffer with 12mA sink and 12mA source.

Open drain...12mA sink with Schmitt trigger, and must meet I2C-Bus Specification

Version 2.1 requirements.

ICLKx

OCLKx

I-R

XTAL clock input.

XTAL clock output.

RBIAS.

I/O-U

AIO

Analog Input/Output Defined in USB specification.

Analog Input/Output.

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Chapter 4 Configuration Options

4.1

2-Port Hub

SMSC’s USB 2.0 2-Port Hub is fully specification compliant to the Universal Serial Bus Specification

Revision 2.0 April 27,2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub

Specification) for general details regarding Hub operation and functionality.

The 2-Port Hub provides 1 Transaction Translator (TT) that is shared by both downstream ports

(defined as Single-TT configuration), The TT contains 4 non-periodic buffers.

4.1.1

Hub Configuration Options

The SMSC Hub supports a large number of features (some are mutually exclusive), and must be

configured in order to correctly function when attached to a USB host controller. There are three

principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without

pin strapping option over-rides). In all cases, the configuration method will be determined by the

CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.

4.1.1.1

Power Switching Polarity

The hub only supports “active high” port power controllers.

4.1.2

VBus Detect

According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power

to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.

The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up

the D+ resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not Powered),

Hub will remove power from the D+ pull-up resistor within 10 seconds.

4.2

EEPROM Interface

The SMSC Hub can be configured via a 2-wire (I2C) EEPROM (256x8). (Please see T a ble 3.1 for

specific details on how to enable configuration via an I2C EEPROM).

The Internal state-machine will (when configured for EEPROM support) read the external EEPROM for

configuration data. The hub will then “attach” to the upstream USB host.

Note: The Hub does not have the capacity to write, or “Program,” an external EEPROM. The Hub only

has the capability to read external EEPROMs. The external eeprom will be read (even if it is blank or

non-populated), and the hub will be “configured” with the values that are read.

Please see Internal Register Set (Common to EEPROM and SMBus) for a list of data fields available.

4.2.1

Internal Register Set (Common to EEPROM and SMBus)

Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map

SMBUS AND

REG

ADDR

INTERNAL

DEFAULT ROM

EEPROM POR

VALUES

R/W

ABBR

00h

01h

02h

R/W

VID LSB

VID MSB

PID LSB

VIDL

VIDM

PIDL

24h

04h

12h

0x00

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Table 4.1 Internal Default, EEPROM and SMBus Register Memory Map (continued)

SMBUS AND

EEPROM POR

VALUES

REG

ADDR

INTERNAL

DEFAULT ROM

R/W

ABBR

03h

04h

05h

06h

07h

08h

09h

0Ah

0Bh

0Ch

0Dh

0Eh

R/W

PID MSB

DID LSB

PIDM

DIDL

25h

00h

8Bh

10h

00h

08h

01h

64h

01h

0x00

DID MSB

DIDM

CFG1

CFG2

CFG3

NRD

Config Data Byte 1

Config Data Byte 2

Config Data Byte 3

Non-Removable Devices

Port Disable (Self)

Port Disable (Bus)

Max Power (Self)

Max Power (Bus)

PDS

PDB

MAXPS

MAXPB

HCMCS

Hub Controller Max Current

(Self)

0Fh

R/W

Hub Controller Max Current

(Bus)

HCMCB

64h

0x00

10h

11h-F5h

F6h

R/W

Power-on Time

Reserved

PWRT

N/A

32h

01h

00h

0x00

Boost_Up

BOOSTUP

N/A

F7h

Reserved

F8h

Boost_2:0

Reserved

BOOST20

N/A

F9h

FAh

Port Swap

Port Remap 12

Reserved

PRTSP

PRTR12

N/A

FBh

FC-FEh

FFh

Status/Command

Note: SMBus register only

STCD

4.2.1.1

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

VID_LSB

Least Significant Byte of the Vendor ID. This is a 16-bit value that uniquely

identifies the Vendor of the user device (assigned by USB-Interface Forum).

This field is set by the OEM using either the SMBus or EEPROM interface

options.

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4.2.1.2

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

VID_MSB

Most Significant Byte of the Vendor ID. This is a 16-bit value that uniquely

identifies the Vendor of the user device (assigned by USB-Interface Forum).

This field is set by the OEM using either the SMBus or EEPROM interface

options.

4.2.1.3

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

PID_LSB

Least Significant Byte of the Product ID. This is a 16-bit value that the Vendor

can assign that uniquely identifies this particular product (assigned by OEM).

This field is set by the OEM using either the SMBus or EEPROM interface

options.

4.2.1.4

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

PID_MSB

Most Significant Byte of the Product ID. This is a 16-bit value that the Vendor

can assign that uniquely identifies this particular product (assigned by OEM).

This field is set by the OEM using either the SMBus or EEPROM interface

options.

4.2.1.5

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

DID_LSB

Least Significant Byte of the Device ID. This is a 16-bit device release

number in BCD format (assigned by OEM). This field is set by the OEM

using either the SMBus or EEPROM interface options.

4.2.1.6

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

DID_MSB

Most Significant Byte of the Device ID. This is a 16-bit device release

number in BCD format (assigned by OEM). This field is set by the OEM

using either the SMBus or EEPROM interface options.

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4.2.1.7

BIT NAME

BIT

NUMBER

DESCRIPTION

SELF_BUS_PWR

Self or Bus Power: Selects between Self- and Bus-Powered operation.

The Hub is either Self-Powered (draws less than 2mA of upstream bus

power) or Bus-Powered (limited to a 100mA maximum of upstream power

prior to being configured by the host controller).

When configured as a Bus-Powered device, the SMSC Hub consumes less

than 100mA of current prior to being configured. After configuration, the Bus-

Powered SMSC Hub (along with all associated hub circuitry, any embedded

devices if part of a compound device, and 100mA per externally available

downstream port) must consume no more than 500mA of upstream VBUS

current. The current consumption is system dependent, and the OEM must

ensure that the USB 2.0 specifications are not violated.

When configured as a Self-Powered device, <1mA of upstream VBUS

current is consumed and all ports are available, with each port being capable

of sourcing 500mA of current.

This field is set by the OEM using either the SMBus or EEPROM interface

options.

Please see the description under Dynamic Power for the self/bus power

functionality when dynamic power switching is enabled.

0 = Bus-Powered operation

1 = Self-Powered operation

Note: If Dynamic Power Switching is enabled, this bit is ignored and the

LOCAL_PWR pin is used to determine if the hub is operating from self or

bus power.

Reserved

HS_DISABLE

High Speed Disable: Disables the capability to attach as either a High/Full-

speed device, and forces attachment as Full-speed only (i.e. no High-Speed

support).

0 = High-/Full-Speed

1 = Full-Speed-Only (High-Speed disabled!)

Reserved

EOP_DISABLE

EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.

During FS operation only, this permits the Hub to send EOP if no

downstream traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0

Specification for additional details. Note: generation of an EOP at the EOF1

point may prevent a Host controller (operating in FS mode) from placing the

USB bus in suspend.

0 = EOP generation is normal

1 = EOP generation is disabled

2:1

CURRENT_SNS

Over Current Sense: Selects current sensing on a port-by-port basis, all

ports ganged, or none (only for bus-powered hubs). The ability to support

current sensing on a port or ganged basis is hardware implementation

dependent.

00 = Ganged sensing (all ports together)

01 = Individual port-by-port

1x = Over current sensing not supported (must only be used with Bus-

Powered configurations!)

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BIT

NUMBER

BIT NAME

DESCRIPTION

PORT_PWR

Port Power Switching: Enables power switching on all ports simultaneously

(ganged), or port power is individually switched on and off on a port- by-port

basis (individual). The ability to support power enabling on a port or ganged

basis is hardware implementation dependent.

0 = Ganged switching (all ports together)

1 = Individual port-by-port switching

4.2.1.8

BIT NAME

BIT

NUMBER

DESCRIPTION

DYNAMIC

Dynamic Power Enable: Controls the ability of the Hub to automatically

change from Self-Powered operation to Bus-Powered operation if the local

power source is removed or is unavailable (and from Bus-Powered to Self-

Powered if the local power source is restored). {Note: If the local power

source is available, the Hub will always switch to Self-Powered operation.}

When Dynamic Power switching is enabled, the Hub detects the availability

of a local power source by monitoring the external LOCAL_PWR pin. If the

Hub detects a change in power source availability, the Hub immediately

disconnects and removes power from all downstream devices and

disconnects the upstream port. The Hub will then re-attach to the upstream

port as either a Bus-Powered Hub (if local-power is unavailable) or a Self-

Powered Hub (if local power is available).

0 = No Dynamic auto-switching

1 = Dynamic Auto-switching capable

Reserved

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms

01 = 4ms

10 = 8ms

11 = 16ms

COMPOUND

Compound Device: Allows the OEM to indicate that the Hub is part

of a compound (see the USB Specification for definition) device. The

applicable port(s) must also be defined as having a "Non-Removable

Device".

Note: When configured via strapping options, declaring a port as

non-removable automatically causes the hub controller to report that

it is part of a compound device.

0 = No

1 = Yes, Hub is part of a compound device

2:0

Reserved

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4.2.1.9

BIT

NUMBER

BIT NAME

DESCRIPTION

7:4

Reserved

PRTMAP_EN

Port Re-mapping enable: Selects the method used by the hub to assign port

numbers and disable ports.

‘0’ = Standard Mode

‘1’ = Port Re-map mode

Reserved

2:0

Reserved

4.2.1.10

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

NR_DEVICE

Non-Removable Device: Indicates which port(s) include non-removable

devices. ‘0’ = port is removable, ‘1’ = port is non-removable.

Informs the Host if one of the active ports has a permanent device that is

undetachable from the Hub. (Note: The device must provide its own

descriptor data.)

When using the internal default option, the NON_REM[1:0] pins will

designate the appropriate ports as being non- removable.

Bit 7= Reserved, always = ‘0’

Bit 6= Reserved, always = ‘0’

Bit 5= Reserved, always = ‘0’

Bit 4= Reserved, always = ‘0’

Bit 3= Reserved, always = ‘1’

Bit 2= 1; Port 2 non-removable

Bit 1= 1; Port 1 non removable

Bit 0= Reserved, always = ‘0’

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4.2.1.11

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_DIS_SP

Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port

is available, ‘1’ = port is disabled.

During Self-Powered operation when remapping mode is disabled

(PRTMAP_EN='0'), this selects the ports which will be permanently

disabled, and are not available to be enabled or enumerated by a Host

Controller. The ports can be disabled in any order, the internal logic will

automatically report the correct number of enabled ports to the USB Host,

and will reorder the active ports in order to ensure proper function.

Bit 7= Reserved, always = ‘0’

Bit 6= Reserved, always = ‘0’

Bit 5= Reserved, always = ‘0’

Bit 4= Reserved, always = ‘0’

Bit 3= Reserved, always = ‘1’

Bit 2= 1; Port 2 is disabled

Bit 1= 1; Port 1 is disabled

Bit 0= Reserved, always = ‘0’

4.2.1.12

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_DIS_BP

Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port

is available, ‘1’ = port is disabled.

During Self-Powered operation when remapping mode is disabled

(PRTMAP_EN='0'), this selects the ports which will be permanently

disabled, and are not available to be enabled or enumerated by a Host

Controller. The ports can be disabled in any order, the internal logic will

automatically report the correct number of enabled ports to the USB Host,

and will reorder the active ports in order to ensure proper function.

When using the internal default option, the PRT_DIS[1:0] pins will disable the

appropriate ports.

Bit 7= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Reserved, always = ‘1’

Bit 2= 1; Port 2 is disabled

Bit 1= 1; Port 1 is disabled

Bit 0 is Reserved, always = ‘0’

4.2.1.13

BIT

NUMBER

BIT NAME

DESCRIPTION

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7:0

MAX_PWR_SP

Max Power Self_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a self-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

Note:

The USB 2.0 Specification does not permit this value to exceed

100mA

4.2.1.14

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

Max Power Bus_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a bus-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

4.2.1.15

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a self-

powered hub. This value includes the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value does NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

Note:

The USB 2.0 Specification does not permit this value to exceed

100mA

A value of 50 (decimal) indicates 100mA, which is the default value.

4.2.1.16

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_BP

Hub Controller Max Current Bus-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a bus-

powered hub. This value will include the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value will NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

A value of 50 (decimal) would indicate 100mA, which is the default value.

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4.2.1.17

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

POWER_ON_TIME

Power On Time: The length of time that it takes (in 2 ms intervals) from the

time the host initiated power-on sequence begins on a port until power is

good on that port.

4.2.1.18

BIT NAME

BIT

NUMBER

DESCRIPTION

7:2

1:0

Reserved

BOOST_IOUT

USB electrical signaling drive strength Boost Bit for the Upstream Port.

‘00’ = Normal electrical drive strength = No boost

‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a 00 value

unless specific implementation issues require additional signal

boosting to correct for degraded USB signalling levels.

4.2.1.19

BIT NAME

BIT

NUMBER

DESCRIPTION

7:4

3:2

Reserved

BOOST_IOUT_2

USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’.

‘00’ = Normal electrical drive strength = No boost

‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a 00 value

unless specific implementation issues require additional signal

boosting to correct for degraded USB signalling levels.

1:0

BOOST_IOUT_1

USB electrical signaling drive strength Boost Bit for Downstream Port ‘1’.

‘00’ = Normal electrical drive strength = No boost

‘01’ = Elevated electrical drive strength = Low (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a 00 value

unless specific implementation issues require additional signal

boosting to correct for degraded USB signalling levels.

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4.2.1.20

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

PRTSP

Port Swap: Swaps the Upstream and Downstream USB DP and DM Pins for

ease of board routing to devices and connectors.

‘0’ = USB D+ functionality is associated with the DP pin and D- functionality

is associated with the DM pin.

‘1’ = USB D+ functionality is associated with the DM pin and D- functionality

is associated with the DP pin.

Bit 7= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Reserved

Bit 2= ‘1’; Port 2 DP/DM is Swapped.

Bit 1= ‘1’: Port 1 DP/DM is Swapped.

Bit 0= ‘1’:Upstream Port DP/DM is Swapped

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4.2.1.21

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

PRTR12

Port remap register for ports 1 & 2.

When a hub is enumerated by a USB Host Controller, the hub is only

permitted to report how many ports it has; the hub is not permitted to select

a numerical range or assignment. The Host Controller will number the

downstream ports of the hub starting with the number '1', up to the number

of ports that the hub reported having.

The host's port number is referred to as "Logical Port Number" and the

physical port on the hub is the “Physical Port Number". When remapping

mode is enabled (see PRTMAP_EN in Register 08h: Configuration Data

Byte 3) the hub's downstream port numbers can be remapped to different

logical port numbers (assigned by the host).

Note:

The OEM must ensure that Contiguous Logical Port Numbers are

used, starting from #1 up to the maximum number of enabled ports;

this ensures that the hub's ports are numbered in accordance with

the way a Host will communicate with the ports.

Table 4.2 Port Remap Register for Ports 1 & 2

Bit [7:4]

‘0000’

‘0001’

‘0010’

Physical Port 2 is Disabled

Physical Port 2 is mapped to Logical Port 1

Physical Port 2 is mapped to Logical Port 2

Illegal; Do Not Use

‘0011’

‘1111’

Bit [3:0]

‘0000’

‘0001’

‘0010’

Physical Port 1 is Disabled

Physical Port 1 is mapped to Logical Port 1

Physical Port 1 is mapped to Logical Port 2

Illegal; Do Not Use

‘0011’

‘1111’

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4.2.1.22

BIT NAME

BIT

NUMBER

DESCRIPTION

7:3

Reserved

INTF_PW_DN

SMBus Interface Power Down

‘0’ = Interface is active

‘1’ = Interface power down after ACk has completed

RESET

Reset the SMBus Interface and internal memory back to RESET_N

assertion default settings.

‘0’ = Normal Run/Idle State

‘1’ = Force a reset of registers to their default state

USB_ATTACH

USB Attach (and write protect)

‘0’ = SMBus slave interface is active

‘1’ = Hub will signal a USB attach event to an upstream device, and the

internal memory (address range 00h-FEh) is “write-protected” to prevent

unintentional data corruption.

4.2.2

I2C EEPROM

The I2C EEPROM interface implements a subset of the I2C Master Specification (Please refer to the

Philips Semiconductor Standard I2C-Bus Specification for details on I2C bus protocols). The Hub’s I2C

EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it conforms to the

Standard-mode I2C Specification (100kbit/s transfer rate and 7-bit addressing) for protocol and

electrical compatibility.

Note: Extensions to the I2C Specification are not supported.

The Hub acts as the master and generates the serial clock SCL, controls the bus access (determines

which device acts as the transmitter and which device acts as the receiver), and generates the START

and STOP conditions.

4.2.2.1

4.2.2.2

Implementation Characteristics

The Hub will only access an EEPROM using the Sequential Read Protocol.

Pull-Up Resistor

The Circuit board designer is required to place external pull-up resistors (10KΩ recommended) on the

SDA/SMBDATA & SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM

manufacturer guidelines) to Vcc in order to assure proper operation.

4.2.2.3

I2C EEPROM Slave Address

Slave address is 1010000.

Note: 10-bit addressing is NOT supported.

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4.2.3

In-Circuit EEPROM Programming

The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s

EEPROM interface and allows an external source to program the EEPROM).

4.3

SMBus Slave Interface

Instead of loading User-Defined Descriptor data from an external EEPROM, the SMSC Hub can be

configured to receive a code load from an external processor via an SMBus interface. The SMBus

interface shares the same pins as the EEPROM interface; if CFG_SEL1 & CFG_SEL0 activates the

SMBus interface, external EEPROM support is no longer available (and the user-defined descriptor

data must be downloaded via the SMBus). Due to system issues, the SMSC Hub waits indefinitely for

the SMBus code load to complete and only “appears” as a newly connected device on USB after the

code load is complete.

The Hub’s SMBus implementation is a subset of the SMBus interface to the host. The device is a

slave-only SMBus device. The implementation in the device is a subset of SMBus since it only supports

two protocols.

The Write Block and Read Block protocols are the only valid SMBus protocols for the Hub. The Hub

responds to other protocols as described in Section 4.3.2, "Invalid Protocol Response Behavior," on

page 26. Reference the System Management Bus Specification, Rev 1.0.

The SMBus interface is used to read and write the registers in the device. The register set is shown

in Section 4.2.1, "Internal Register Set (Common to EEPROM and SMBus)," on page 13.

4.3.1

Bus Protocols

Typical Write Block and Read Block protocols are shown below. Register accesses are performed

using 7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The shading

indicates the Hub driving data on the SMBDATA line; otherwise, host data is on the SDA/SMBDATA

line.

The slave address is the unique SMBus Interface Address for the Hub that identifies it on SMBus. The

the data that the host is attempting to write to the register or the contents of the register that the host

is attempting to read.

Note: Data bytes are transferred MSB first (msb first).

4.3.1.1

Block Read/Write

The Block Write begins with a slave address and a write condition. After the command code, the host

issues a byte count which describes how many more bytes will follow in the message. If a slave had

20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. The

byte count may not be 0. A Block Read or Write is allowed to transfer a maximum of 32 data bytes.

Note: For the following SMBus tables:

Denotes Master-to-Slave

Denotes Slave-to-Master

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Slave Address

...

Byte Count = N

Data byte 1

Data byte 2

Data byte N

Block Write

Figure 4.1 Block Write

Block Read

A Block Read differs from a block write in that the repeated start condition exists to satisfy the I2C

specification’s requirement for a change in the transfer direction.

Slave Address

Slave Address Rd

...

Byte Count = N

Data byte 1

Data byte 2

Data byte N

Block Read

Figure 4.2 Block Read

4.3.2

Invalid Protocol Response Behavior

Registers that are accessed with an invalid protocol are not updated. A register is only updated

following a valid protocol. The only valid protocols are Write Block and Read Block, which are

described above.

The Hub only responds to the hardware selected Slave Address.

Attempting to communicate with the Hub over SMBus with an invalid slave address or invalid protocol

results in no response, and the SMBus Slave Interface returns to the idle state.

The only valid registers that are accessible by the SMBus slave address are the registers defined in

the Registers Section. See Section 4.3.3 for the response to undefined registers.

4.3.3

4.3.4

General Call Address Response

The Hub does not respond to a general call address of 0000_000b.

Slave Device Time-Out

According to the SMBus Specification, V1.0 devices in a transfer can abort the transfer in progress

and release the bus when any single clock low interval exceeds 25ms (T

). Devices that

TIMEOUT, MIN

have detected this condition must reset their communication and be able to receive a new START

condition no later than 35ms (T ).

TIMEOUT, MAX

Note: Some simple devices do not contain a clock low drive circuit; this simple kind of device typically

resets its communications port after a start or stop condition. The Slave Device Time-Out must

be implemented.

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4.3.5

4.3.6

4.3.7

Stretching the SCLK Signal

The Hub supports stretching of the SCLK by other devices on the SMBus. The Hub does not stretch

the SCLK.

SMBus Timing

The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing

in the “Timing Diagram” section.

Bus Reset Sequence

The SMBus Slave Interface resets and returns to the idle state upon a START field followed

immediately by a STOP field.

4.3.8

SMBus Alert Response Address

The SMBALERT# signal is not supported by the Hub.

4.3.8.1

Undefined Registers

The registers shown in T a ble 4.1 are the defined registers in the Hub. Reads to undefined registers

return 00h. Writes to undefined registers have no effect and do not return an error.

4.3.8.2

Reserved Registers

Unless otherwise instructed, only a ‘0’ may be written to all reserved registers or bits.

4.4

Default Configuration Option:

The SMSC Hub can be configured via its internal default configuration. (please see Section 4.2.1,

"Internal Register Set (Common to EEPROM and SMBus)" for specific details on how to enable default

configuration.)

Please refer to T a ble 4.1 for the internal default values that are loaded when this option is selected.

4.5

Default Strapping Options:

The USB2512i can be configured via a combination of internal default values and pin strap options.

Please see T a ble 3.1 and T a ble 3.2 for specific details on how to enable the default/pin-strap

configuration option.

The strapping option pins only cover a limited sub-set of the configuration options. The internal default

values will be used for the bits & registers that are not controlled by a strapping option pin. Please

refer to T a ble 4.1 for the internal default values that are loaded when this option is selected.

4.6

Reset

There are two different resets that the Hub experiences. One is a hardware reset (either from the

internal POR reset circuit or via the RESET_N pin) and the second is a USB Bus Reset.

4.6.1

Internal POR Hardware Reset

All reset timing parameters are guaranteed by design.

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4.6.2

External Hardware RESET_N

A valid hardware reset is defined as assertion of RESET_N for a minimum of 1us after all power

supplies are within operating range. While reset is asserted, the Hub (and its associated external

circuitry) consumes less than 500μA of current from the upstream USB power source.

Assertion of RESET_N (external pin) causes the following:

1. All downstream ports are disabled, and PRTPWR power to downstream devices is removed.

2. The PHYs are disabled, and the differential pairs will be in a high-impedance state.

3. All transactions immediately terminate; no states are saved.

4. All internal registers return to the default state (in most cases, 00(h)).

5. The external crystal oscillator is halted.

6. The PLL is halted.

The Hub is “operational” 500μs after RESET_N is negated.

Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the

SMBus option is not disabled).

4.6.2.1

RESET_N for Strapping Option Configuration

Drive Strap

Outputs to

inactive

Start

completion

request

Hardware

reset

asserted

Attach

USB

Upstream

Read Strap

Options

USB Reset

recovery

Idle

levels

response

RESET_N

VSS

Strap Pins

VSS

Don’t Care

Valid

Driven by Hub if strap is an output.

Don’t Care

Figure 4.3 Reset_N Timing for Default/Strap Option Mode

Table 4.3 Reset_N Timing for Default/Strap Option Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

nsec

μsec

msec

Strap Setup Time

16.7

Strap Hold Time.

1400

hub outputs driven to inactive logic states

USB Attach (See Note).

1.5

100

Host acknowledges attach and signals USB

Reset.

100

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Table 4.3 Reset_N Timing for Default/Strap Option Mode (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

USB Idle.

undefined

msec

Completion time for requests (with or without data

stage).

Notes:

„

When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than

100mA from the upstream USB power source during t1+t5.

„

All Power Supplies must have reached the operating levels mandated in Chapter 5, DC

Parameters, prior to (or coincident with) the assertion of RESET_N.

4.6.2.2

RESET_N for EEPROM Configuration

Start

completion

request

Hardware

Read EEPROM

Set Options

Attach

USB

Upstream

Read Strap

Options

USB Reset

recovery

reset

asserted

Idle

response

RESET_N

VSS

Figure 4.4 Reset_N Timing for EEPROM Mode

Table 4.4 Reset_N Timing for EEPROM Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

msec

Hub Recovery/Stabilization.

EEPROM Read / Hub Config.

USB Attach (See Note).

500

99.5

100

2.0

Host acknowledges attach and signals USB

Reset.

100

USB Idle.

undefined

msec

Completion time for requests (with or without data

stage).

Notes:

„

When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than

100mA from the upstream USB power source during t4+t5+t6+t7.

„

All Power Supplies must have reached the operating levels mandated in Chapter 5, DC

Parameters, prior to (or coincident with) the assertion of RESET_N.

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4.6.2.3

RESET_N for SMBus Slave Configuration

Start

completion

request

Hardware

reset

asserted

Attach

USB

Upstream

Reset

SMBus Code

Load

Hub PHY

USB Reset

recovery

Idle

Negation

Stabilization

response

RESET_N

VSS

Figure 4.5 Reset_N Timing for SMBus Mode

Table 4.5 Reset_N Timing for SMBus Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

msec

Hub Recovery/Stabilization.

SMBus Code Load (See Note).

Hub Configuration and USB Attach.

500

300

100

250

Host acknowledges attach and signals USB

Reset.

100

USB Idle.

Undefined

msec

Completion time for requests (with or without data

stage).

Notes:

„

For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated

circuitry must not consume more than 100mA from the upstream USB power source during

t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load

the configuration is determined by the external SMBus host.

„

All Power Supplies must have reached the operating levels mandated in Chapter 5, DC

Parameters, prior to (or coincident with) the assertion of RESET_N.

4.6.3

USB Bus Reset

In response to the upstream port signaling a reset to the Hub, the Hub does the following:

Note: The Hub does not propagate the upstream USB reset to downstream devices.

1. Sets default address to 0.

2. Sets configuration to: Unconfigured.

3. Negates PRTPWR[2:1] to all downstream ports.

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4. Clears all TT buffers.

5. Moves device from suspended to active (if suspended).

6. Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset

sequence.

The Host then configures the Hub and the Hub’s downstream port devices in accordance with the USB

Specification.

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Chapter 5 DC Parameters

5.1

Maximum Guaranteed Ratings

PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Storage

Temperature

-55

150

°C

Lead

325

2.5

4.6

°C

Soldering < 10 seconds

Temperature

1.8V supply

voltage

DDA18PLL,

DD18

3.3V supply

voltage

DDA33,

DD33PLL,

DD33,

DD33CR

Voltage on any

I/O pin

-0.5

5.5

4.0

3.6

Voltage on

XTAL1

Voltage on

XTAL2

Note: Stresses above the specified parameters could cause permanent damage to the device. This

is a stress rating only and functional operation of the device at any condition above those

indicated in the operation sections of this specification is not implied. When powering this

device from laboratory or system power supplies, it is important that the Absolute Maximum

Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage

spikes on their outputs when the AC power is switched on or off. In addition, voltage transients

on the AC power line may appear on the DC output. When this possibility exists, it is suggested

that a clamp circuit be used.

5.2

Recommended Operating Conditions

PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Operating

Temperature

-40

°C

1.8V supply voltage

1.62

3.0

1.98

3.6

DDA18PLL

DD18

3.3V supply voltage

DDA33

DDA33PLL

DD33

DD33CR

Voltage on any I/O pin

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-0.3

5.5

If any 3.3V supply voltage drops

below 3.0V, then the MAX

becomes:

(3.3V supply voltage) + 0.5

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PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Voltage on XTAL1

Voltage on XTAL2

-0.3

DDA33

DD18

Table 5.1 DC Electrical Characteristics

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

I, IS Type Input Buffer

Low Input Level

0.8

TTL Levels

ILI

IHI

High Input Level

2.0

-10

250

Input Leakage

+10

350

= 0 to V

IN DD33

Hysteresis (‘IS’ Only)

HYSI

Input Buffer with Pull-Up

(IPU)

Low Input Level

0.8

TTL Levels

ILI

High Input Level

Low Input Leakage

High Input Leakage

2.0

+35

-10

IHI

+90

+10

= 0

= V

ILL

IHL

DD33

Input Buffer with Pull-

Down (IPD)

Low Input Level

High Input Level

Low Input Leakage

High Input Leakage

ICLK Input Buffer

Low Input Level

High Input Level

Input Leakage

0.8

TTL Levels

ILI

2.0

+10

-35

IHI

-10

-90

= 0

= V

ILL

IHL

DD33

0.5

ILCK

1.4

-10

IHCK

+10

= 0 to V

DD33

O12, I/O12 &I/OSD12

Type Buffer

Low Output Level

0.4

= 12mA @ V

= 3.3V

DD33

High Output Level

Output Leakage

2.4

-10

250

= -12mA @ V

= 3.3V

DD33

+10

350

= 0 to V

IN DD33

(Note 1)

Hysteresis (‘SD’ pad only)

HYSC

IO-U

(Note 2)

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Table 5.1 DC Electrical Characteristics (continued)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

Supply Current

Unconfigured

High-Speed Host

Full-Speed Host

CCINTHS

CCINITFS

Supply Current

Configured

All supplies combined

(High-Speed Host)

1 Port HS, 1 Port LS/FS

2 Ports @ LS/FS

2 Ports @ HS

130

120

135

145

140

210

HCH1C1

HCC2

HCH2

Supply Current

Configured

(Full-Speed Host)

1 Port

2 Ports

105

135

FCC1

FCC2

Supply Current

Suspend

310

105

540

340

μA

All supplies combined

CSBY

Supply Current

Reset

μA

CRST

Notes:

1. Output leakage is measured with the current pins in high impedance.

2. See USB 2.0 Specification for USB DC electrical characteristics.

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CAPACITANCE T = 25°C; fc = 1MHz; V

, V

= 1.8V

DDPLL

DD18

Table 5.2 Pin Capacitance

LIMITS

PARAMETER

SYMBOL

MIN

TYP MAX UNIT

TEST CONDITION

Clock Input

Capacitance

All pins except USB pins (and pins under

test tied to AC ground)

XTAL

Input Capacitance

Output Capacitance

OUT

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Chapter 6 AC Specifications

6.1

Oscillator/Clock

Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ±350ppm.

External Clock: 50% Duty cycle ± 10%, 24 MHz ± 350ppm, Jitter < 100ps rms.

XTAL1

(C_{S1 =}

C_B+ C_XTAL

)

C₁

1Meg

Crystal

C_L

C₂

XTAL2

(C_{S2 =}

C_B+ C_XTAL

)

Figure 6.1 Typical Crystal Circuit

equals total board/trace capacitance.

Note:

(C₁+ C_S1) x (C₂+ C_S2)

(C₁+ C_S1+ C₂+ C_S2)

C_L

Figure 6.2 Formula to find value of C and C

6.1.1

SMBus Interface:

The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set

forth in the SMBus 1.0 Specification for Slave-Only devices (except as noted in Section 4.3).

6.1.2

6.1.3

I2C EEPROM:

Frequency is fixed at 58.6KHz ± 20%.

USB 2.0

The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set

forth in the USB 2.0 Specification. Please refer to the USB 2.0 Specification for more information.

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Chapter 7 Package Outline

Figure 7.1 36-Pin QFN, 6x6mm Body, 0.5mm Pitch

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