S16A
SBus 16-b it Dua l Ana log Inte rfa c e
for the Sun SPARCsta tion
USER’S GUIDE
008-00630-01
T
E
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S16A User’s Guide
Contents
Overview .......................................................................................................................................................................1
Installation.....................................................................................................................................................................2
Installing the Hardware.....................................................................................................................................2
Installing the Software .......................................................................................................................................2
Using SunOS Version 4.1 .........................................................................................................................2
Using System V Release 4 (Solaris 2.4 or Later) ...................................................................................4
Building the Sample Programs ...............................................................................................................4
Included Files ......................................................................................................................................................5
Input and Output .........................................................................................................................................................6
Elements of S16A Applications ........................................................................................................................6
DMA Library Routines ......................................................................................................................................7
Error Conditions ...............................................................................................................................................22
Hardware Interface ....................................................................................................................................................23
Electrical Interface ............................................................................................................................................23
Interface Signals................................................................................................................................................24
Connector Pinout..............................................................................................................................................25
Registers.......................................................................................................................................................................26
SBus Addresses.................................................................................................................................................27
DMA Registers..................................................................................................................................................28
Current DMA Address Registers .........................................................................................................28
Next DMA Address Registers...............................................................................................................28
Current Count Registers ........................................................................................................................29
Control and Next Count Registers .......................................................................................................29
Direct I/ O Registers .........................................................................................................................................30
DIO Direction Register ...........................................................................................................................30
DIO Data Register ...................................................................................................................................30
DAC Output Control Register ........................................................................................................................30
Analog Input Module Internal Registers ......................................................................................................31
Input Clock Prescale Registers..............................................................................................................32
Input Configuration Registers ..............................................................................................................32
Trim Registers..........................................................................................................................................33
Temperature Register .............................................................................................................................34
Analog Input Module UART Registers.........................................................................................................34
Analog Input Module Control Protocol ..............................................................................................34
UART Command/ Status Register........................................................................................................36
UART Data Register ...............................................................................................................................37
Xilinx Programming Registers........................................................................................................................37
Specifications ..............................................................................................................................................................38
References....................................................................................................................................................................39
Contacting EDT ..........................................................................................................................................................40
Index.............................................................................................................................................................................41
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S16A User’s Guide
Tables
General DMA Library Routines .....................................................................................................................................7
S16A-specific Library Routines......................................................................................................................................8
Error Codes and Conditions..........................................................................................................................................22
S16A Interface Signals..................................................................................................................................................24
Connector Pinout...........................................................................................................................................................25
DMA Channel Assignments .........................................................................................................................................28
Current DMA Address Registers ..................................................................................................................................28
Next DMA Address Registers.......................................................................................................................................29
Current Count Registers................................................................................................................................................29
Control and Next Count Registers ................................................................................................................................29
DAC Output Control Register.......................................................................................................................................31
Analog Input Module Internal Registers.......................................................................................................................31
Input Selection (Low Byte) Values...............................................................................................................................32
Input Gain (High Byte) Values .....................................................................................................................................33
Trim Registers...............................................................................................................................................................33
UART Command/Status Register.................................................................................................................................36
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S16A User’s Guide
Overview
Overview
The S16A SBus 16-bit Dual Analog Interface is a single-slot board for SBus-based computer systems. The
S16A has two analog I/ O channels, each incorporating one 16-bit Analog-to-Digital (ADC) converter and
one 20-bit Digital-to-Analog (DAC) converter. The S16A is designed for continuous input and output on
both channels simultaneously and is typically used for scientific and medical research and development.
®
The S16A employs two Burr-Brown PCM1702 analog output DACs running at a sample rate of 705.6KHz,
which is 16 times the standard audio frequency of 44.1 KHz.
®
The two S16A analog input ADCs are National Semiconductor ADC16071s, running with a base sampling
rate of 192KHz. The S16A provides a clock prescale register to divide this frequency down for lower rates.
The S16A uses the SBus DMA interface and can transmit or receive any amount of data to and from host
memory continuously on both channels at once.
Each I/ O channel’s input ADC can monitor a differential signal, either of the two differential inputs as a
single-ended signal, either of two I/ O channels’ DAC outputs, or a reference ground. The ability to monitor
the outputs directly or ground allows the S16A to be tested and adjusted using these internal loop-backs.
A portion of the functionality of the S16A is contained in a sub-assembly, the Analog Input Module. This
module is controlled and configured using a byte-sequence protocol, as described in the section Analog
Input Module Control Protocol beginning on page 34.
The S16A boards fully support the requirements of the SunOS operating system. Example programs are
included. Each of the two I/ O channels appears as two subdevices to the SunOS operating system, one for
input and one for output, for a total of four subdevices.
This document explains how to install the S16A interface and driver and how to write applications for it. It
is divided into the following sections:
Installation
describes how to install the board and its related software.
describes the programming interface library.
Input and Output
Hardware Interface Protocol
provides a connector pin-out diagram and describes the S16A signals
and timing.
Registers
describes the hardware registers.
Specifications
References
lists the product specifications.
lists other documentation resources that may be helpful.
Contacting EDT
describes how to contact EDT, and how to access EDT resources on the
Internet.
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Installation
S16A User’s Guide
Installation
Installing the S16A SBus 16-bit Dual Analog Interface is a two-step process. First you must physically install
the board inside the host computer. Then you must install the software driver so that applications can
access the S16A. Hardware installation is described in the following section. Software installation is
described in the section after.
Installing the Hardware
The S16A board is a single-slot SBus board. To install it, refer to your SBus host computer documentation
for complete information on installing an SBus board. For example, many Sun systems contain this
information in a manual entitled SPARCstation Installation Guide.
Use the following procedure to install the SBus 16-bit Dual Analog Interface:
CAUTION
Both the S16A and your SBus host computer contain static-sensitive components. Install
the S16A at a static-free work area. If a static-free work area is not available, take the
following precautions to reduce the risk of component damage:
1. Remove from the immediate area all materials that can generate or hold a static
charge.
2. Discharge yourself by touching both hands to a metal portion of the host computer’s
chassis before you open the host computer or open the S16A static-shielded bag.
1. Unpack the SBus 16-bit Dual Analog Interface from the shipping packaging. Do not remove the S16A
from the static shielding bag until you remove all other packaging materials from the area and establish
a static-free work area.
2. Install the S16A in the SBus host, following the directions provided with the SBus host. The S16A can
be installed in any DMA slot.
To remove the SBus 16-bit Dual Analog Interface, reverse the installation procedure.
The SBus 16-bit Dual Analog Interface connects to your device with a cable. This cable is typically device-
specific.
Installing the Software
The S16A can run on a Sun workstation using either SunOS Version 4.1.3 or later or Solaris 2.4 or later
(System V Release 4, or SVR 4). The installation procedures differ. Both are given below.
Using SunOS Version 4.1
If you are using SunOS Version 4.1.3 or later, use the following procedure to install the S16A driver:
1. Become root or superuser.
2. Create a directory in which you wish to install the S16A driver. EDT suggests /var/EDTs16a.
3. Change to the directory in which you wish to install the S16A driver.
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S16A User’s Guide
Installation
4. Place the diskette that came with the S16A into the diskette drive.
5. The S16A driver and related files are included on a diskette in tar format. To copy them to your hard
disk, enter:
tar xvf /dev/rfd0
6. The tar program extracts a number of files. (The list of files distributed is provided in the section entitled
Included Files.) The S16A diskette contains versions of the S16A driver for a variety of Sun platforms
and versions of the Sun operating system. The installation program installs the correct driver based on
the host platform and operating system version.
7. To install the driver, enter:
make install
The makefile provided installs and loads the S16A driver.
8. During the installation, the following question appears on the display:
Automatically load the S16A driver during each reboot? [y|n] (y):
Entering y(or simply typing <Return>) causes the S16A driver to be loaded whenever you reboot
your host computer. If you respond with n, you must manually reload the driver after rebooting. To do
so, enter:
make load
9. During the installation, the following question appears on the display:
How many S16A devices do you want? (1):
You can install as many S16A boards in your system as you have DMA SBus slots available. Enter the
number corresponding to the number of S16A boards you have installed in your system. If you simply
type <Return>, one S16A device entry is installed. Note that each S16A board is appears to SunOS as
one main device and four unidirectional subdevices, one input and one output each for both of the
analog I/ O channels.
NOTE: If you anticipate installing more than one S16A board into your system, install
as many S16A device entries as you will ultimately require. The extra device
entries will do no harm and will be there when you need them, saving you a
step.
10. If the S16A has not been installed inside the host computer, or has been installed incorrectly, the follow-
ing message appears on the display:
Can’t load this module
If you see this message, go back to the section entitled Installing the Hardware and reinstall the board.
If troubles persist, contact EDT for further assistance.
To unload the S16A driver:
1. Change to the directory in which you placed the S16A files, if you are not already there.
2. Become root or superuser.
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Installation
S16A User’s Guide
3. Enter:
make unload
Using System V Release 4 (Solaris 2.4 or Later)
If you are using Sun System V Release 4 (Solaris 2.4 or later), use the following procedure to install the S16A
driver:
1. Become root or superuser.
2. Place the diskette that came with the S16A into the diskette drive.
3. Enter:
volcheck
pkgadd -d /floppy/floppy0 EDTs16a
The pkgadd program asks several confirmation questions, which you can answer with a yfor
affirmative. Refer to your Solaris system administration documentation for further information on the
pkgadd command.
To remove the S16A driver:
1. Become root or superuser.
2. Enter:
pkgrm EDTs16a
For further details, consult your Solaris 2.0 documentation, or call Engineering Design Team, Inc.
Building the Sample Programs
To build any of the example programs, enter the command:
make file
where file is the name of the example program you wish to install, without the .c suffix.
To build and install all the example programs, simply enter the command:
make
All example programs display a message that explains their usage when you invoke them with the -h
switch.
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Installation
Included Files
The S16A driver release diskette contains the following files (see the readme file for a complete, up-to-date
listing):
s16a.o.sun4c
s16a.o.sun4m
The executable S16A driver for SunOS 4.1.3 on a Sun 4C architecture such as a
SPARCStation 1, 1+, 2, or IPC.
The executable S16A driver for SunOS 4.1.3 on a Sun 4M architecture such as a
SPARCStation 5, 10, 20, LX, Classic, or an Ultra 1 or 2.
s16a
The executable S16A driver for Solaris Version 2.4 or later.
Initializes the S16A Xilinx hardware at boot time.
Xilinx data file.
s16aload.c
s16a.rbt
drv_ioctl.h
s16a_reg.h
libs16a.h
libs16a.c
s16a.h
Common driver architecture ioctl definitions.
Hardware definitions for the drivers.
Library definitions for applications using the libs16a.a library.
Source code for the libs16a.a library.
The S16A driver header file, defining ioctls and registers.
The installation script used by the S16A makefile.
s16a.INSTALL
makefile
The makefile for installing, loading, and unloading the S16A driver, and making
example programs. Used with the SunOS make command to automatically install the
driver or compile the example programs.
README
setdebug.c
calfiles/*
An ASCII file containing last-minute information about the S16A software.
This file sets the internal driver debug levels for the S16A. Call EDT for details.
Calibration files whose names match the serial numbers of shipped units.
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Input and Output
S16A User’s Guide
Input and Output
The driver can perform two kinds of DMA transfers: continuous and noncontinuous. For noncontinuous
transfers, the driver uses DMA system calls for read() and write(). Each read() and write() system call allocates
kernel resources, during which time DMA transfers are interrupted.
To perform continuous transfers, use the ring buffers. The ring buffers area set of buffers that applications
can access continuously, reading and writing as required. When the last buffer in the set has been accessed,
the application then cycles back to the first buffer. See s16a_configure_ring_buffers for a complete
description of the ring buffer parameters that you can configure.
Elements of S16A Applications
S16A applications for performing noncontinuous transfers typically include the following elements:
1. The preprocessor statement
#include "libs16a.h"
2. A call to s16a_open(), such as:
s16a_p = s16a_open(s16a_p) ;
3. A call to s16a_read()or s16a_write(), such as:
s16a_read(s16a_p, buf_ptr, 512) ;
or:
s16a_write(s16a_p, buf_ptr, 1024) ;
4. A call to s16a_close()to close the device before ending the program, such as:
s16a_close(s16a_p) ;
5. The -ls16aoption to the compiler, to link the library file libs16a.a with your program
S16A applications for performing continuous transfers typically include the following elements:
1. The preprocessor statement
#include "s16a.h"
2. A call to s16a_open(), such as:
s16a_p = s16a_open(s16a_p) ;
3. A call to s16a_configure_ring_buffers()to set up the ring buffers as required, such as:
s16a_configure_ring_buffers(s16a_p, 1024, 4, NULL, EDT_READ) ;
4. A call to s16a_start_buffers()with an argument of 0 to initiate a continuous transfer, such as:
s16a_start_buffers(s16a_p, 0) ;
5. A call to s16a_wait_for_buffer()or s16a_wait_for_next_buffer()to , such as:
buf_ptr = s16a_wait_for_buffer(s16a_p, 4) ;
6. A call to s16a_close()to close the device before ending the program, as in:
s16a_close(s16a_p) ;
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S16A User’s Guide
Input and Output
7. The -ls16aoption to the compiler, to link the library file libs16a.a with your program
See the makefile and example programs provided for examples of compiling code using the library
routines.
DMA Library Routines
The DMA library provides a set of consistent routines across many of the EDT products, with simple yet
powerful ring-buffered DMA capabilities. Table 1, DMA Library Routines lists the general DMA library
routines. In addition, if driver-specific library routines exist, they can be found in a table thereafter.
The sections that follow describe the DMA library routines in alphabetical order.
Routine
Description
s16a_open
s16a_close
s16a_read
Opens the S16A for application access.
Terminates access to the S16A and releases resources.
Single, application-level buffer read from the S16A.
Single, application-level buffer write to the S16A.
Restores the driver and hardware to factory-specified default state.
s16a_write
s16a_set_defaults
s16a_configure_ring_buffers Configures the ring buffers.
s16a_buffer_addresses
s16a_wait_for_buffer
s16a_wait_for_next_buffer
s16a_check_next_buffer
s16a_start_buffers
s16a_cancel
Returns addresses of ring buffers.
Blocks until specified buffers have completed.
Blocks until the next buffer completes.
Checks whether next buffer is complete.
Begins transfer from or to specified number of buffers.
Shuts down the device as soon as possible, optionally resets it.
Cancels the current DMA, moves pointers to the next.
Stops the interface after all buffers have completed.
Return absolute (cumulative) number of completed buffers.
Checks for parity error since last call.
s16a_cancel_current
s16a_stop_buffers
s16a_done_count
foi_parity_error
Table 1. General DMA Library Routines
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Input and Output
S16A User’s Guide
The following driver-specific routines are also available:
Routine
Description
s16a_get_dac_control_reg
s16a_get_dio_data_reg
s16a_get_dio_direction_reg
s16a_get_output_bits
s16a_serial_read
Get the current state of the output DAC control register.
Get the current state of the DIO Data register.
Get the current state of the DIO Direction register.
Get the output resolution of the S16A.
Read a response string from the Analog Input module.
s16a_serial_str
Send a command string to the Analog Input module and return the
response only if it differs from the string sent.
s16a_serial_write
Send a command string to the Analog Input module.
Write a value to the output DAC Control register.
Write a value to the DIO Data register.
s16a_set_dac_control_reg
s16a_set_dio_data_reg
s16a_set_dio_direction_reg
s16a_set_output_bits
Write a value to the DIO Direction register.
Set the output resolution of the S16A.
Table 2. S16A-specific Library Routines
s16a_buffer_addresses
Description
Returns an array containing the addresses of the buffers.
Syntax
void **s16a_buffers(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open.
Return
Address of an array of pointers to the ring buffers allocated by the driver or the library. The array of buffer
pointers is allocated by the library. Null on error.
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Input and Output
s16a_cancel
Description
Stops any transfers currently in progress, resets the ring buffer pointers to restart on the current buffer.
Syntax
int s16a_cancel(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open.
Return
0 on success, –1 on failure. Sets errno on failure.
s16a_cancel_current
Description
Stops the current transfers, resets the ring buffer pointers to the next buffer.
Syntax
int s16a_cancel(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open.
Return
0 on success, –1 on failure. Sets errno on failure.
s16a_check_next_buffer
Description
Checks whether the next buffer is complete.
Syntax
int s16a_check_next_buffer(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open.
Return
0 on success, –1 on failure. Sets errno on failure.
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S16A User’s Guide
s16a_close
Description
Closes the device associated with the device handle and frees the handle.
Syntax
int s16a_close(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open.
Return
0 on success, –1 on failure. Sets errno on failure.
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s16a_configure_ring_buffers
Description
Configures the SBus 16-bit Dual Analog Interface ring buffers. Any previous configuration is replaced, and
previously allocated buffers are released.
Buffers can be allocated and maintained within the SBus 16-bit Dual Analog Interface library or within the
user application itself.
Syntax
int s16a_configure_ring_buffers(S16aDev *s16a_p, int bufsize, int nbufs,
void *bufarray[], int data_output);
Arguments
s16a_p
bufsize
S16A device handle returned from s16a_open
size of each buffer. For optimal efficiency, allocate a value approximating throughput
divided by 20: that is, if transfer occurs at 20 MB per second, allocate 1 MB per buffer.
Buffers significantly larger or smaller can overuse memory or lock the system up in
processing interrupts.
nbufs
number of buffers. Must be 1 or greater. Four is recommended.
bufarray
array of pointers to individual buffers if the buffers are allocated by the application. Must
be NULL if in library, or have nbufs elements.
library
user
Must be NULL.
This array must be filled with the addresses of the buffers allocated by
the application for the library to use.
data_direction Indicates whether this connection is to be used for input or output. Only one direction is
possible per device or subdevice:
EDT_READ = 0
EDT_WRITE = 1
Return
0 on success; –1 on error. If all buffers cannot be allocated, none are allocated and an error is returned.
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S16A User’s Guide
s16a_done
Description
Returns the cumulative count of completed buffer transfers.
Syntax
int s16a_done_count(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open.
Return
The number of completed buffer transfers. Completed buffers are numbered consecutively starting with 0
when the S16A is opened. (Thus, the allocated buffer number is the transferred buffer number modulo the
number of allocated buffers.)
s16a_get_dac_control_reg
Description
Get current state of the output DAC control register. To check for an error, clear the errno global variable
before calling this function, then check it for non-zero after the function returns.
Syntax
u_int s16a_get_dac_control_reg(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
Integer containing current state of the DAC Control register. The global variable errno is set on error.
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Input and Output
s16a_get_dio_data_reg
Description
Get current state of the DIO Data register. The low 12 bits reflect the current state of the DIO pins. Bits that
are configured as outputs are read as zero. To check for an error, clear the errno global variable before calling
this function, then check it for nonzero after the function returns.
Syntax
u_int s16a_get_dio_data_reg(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
Integer containing current state of the DIO Data register. The global variable errno is set on error.
s16a_get_dio_direction_reg
Description
Get current state of the DIO Direction register. The low 12 bits reflect the configuration of the corresponding
DIO pins. If a bit is set, the DIO pin of the same number is configured as an output signal. To check for an
error, clear the errno global variable before calling this function, then check it for nonzero after the function
returns.
Syntax
u_int s16a_get_dio_direction_reg(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
Integer containing current state of the DIO Direction register. The global variable errno is set on error.
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S16A User’s Guide
s16a_get_output_bits
Description
Get the output resolution of the S16A. Returns 16 or 20, reflecting the current driver setting for the output
channel.
Syntax
int s16a_get_output_bits(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
Returns 16 or 20 on success; returns –1 if the ioctl driver call fails, and sets errno to indicate the problem.
s16a_open
Description
Opens the specified S16A and sets up the device handle.
Syntax
S16aDev *s16a_open(int unit, int channel, int output);
Arguments
unit
specifies the device unit number
channel
output
specifies the analog I/ O channel number: 0 or 1
specifies the direction: 1 means the output subdevice; 0 means the input subdevice
Return
A handle of type (S16aDev *), or NULLif error. If an error occurs, check the errno global variable for the
error number.
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Input and Output
s16a_read
Description
Performs a read on the S16A. The UNIX 2 GB file offset bug is avoided during large amounts of input or
31
output, that is, reading past 2 does not fail. This call is not multibuffering, and no transfer is active when
it completes.
Syntax
int s16a_read(S16aDev *s16a_p, void *buf, int size);
Arguments
s16a_p
buf
S16A device handle returned from s16a_open
address of buffer to read into
size of read in bytes
size
Return
The return value from read; errno is set by read on error.
s16a_serial_read
Description
Read a response string from the Analog Input Module.
Syntax
int s16a_serial_read(S16aDev *s16a_p, char *buf, size);
Arguments
s16a_p
buf
S16A device struct, returned from s16a_open
Array of characters to receive the response string from the Analog Input Module
Number of characters in the buffer
size
Return
Returns the actual number of bytes transferred; or –1 on ioctl error. Sets errno on failure.
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S16A User’s Guide
s16a_serial_str
Description
Send a command string to the Analog Input Module. Read the response from the AIM and return it only if
it differs from the command string sent. Otherwise return NULL. This routine is especially useful for
command strings, which echo the command string, unless an error occurs.
Syntax
char *s16a_serial_str(S16aDev *s16a_p, char *str);
Arguments
s16a_p
str
S16A device struct, returned from s16a_open
Null-terminated command string to send to the Analog Input Module
Return
NULL indicates a response string that matches the input command string, which indicates successful
transmission. Otherwise, this routine returns a pointer to a string containing the characters received in
response to the command string. The response string is in a single buffer allocated by the library. Therefore,
if you need to preserve the response string, you must copy it to another buffer before making another
libs16a.a library call. Sets errno on failure.
s16a_serial_write
Description
Send a command string to the Analog Input Module.
Syntax
int s16a_serial_write(S16aDev *s16a_p, char *buf, size);
Arguments
s16a_p
buf
S16A device struct, returned from s16a_open
Array of characters containing the command string to send to the Analog Input Module
Number of characters in the command string
size
Return
Success: number of characters transferred; –1 on driver error. Sets errno on failure.
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Input and Output
s16a_set_dac_control_reg
Description
Write a specified value to the output DAC Control register.
Syntax
int s16a_set_dac_control_reg(S16aDev *s16a_p, int value);
Arguments
s16a_p
value
S16A device handle returned from s16a_open
Value to write to the DAC Control register.
Return
Returns 0 on success or –1 on failure. Fails if s16a_p does not refer to an output channel. Sets errno on failure.
s16a_set_defaults
Description
Resets the S16A configuration to its default state:
• The Xilinx Programming registers are set to S16A_XRESET and then cleared.
• The UART Command/ Status register and the DAC Output Control register are set to 0.
• Gain and offset values are set from /dev/s16a.cfg, which is generated when you run s16acalibrate.
• Ring buffer mode is disabled and driver- or library-allocated ring buffers are released.
Syntax
int s16a_set_defaults(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
Return value from ioctl call to driver: 0 on success; –1 on error. If an error occurs, check the errno global
variable for the error number.
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Input and Output
S16A User’s Guide
s16a_set_dio_data_reg
Description
Write a specified value to the DIO Data register. Only the low 12 bits are significant; of these, bits that are
configured as inputs are ignored when written.
Syntax
int s16a_set_dio_data_reg(S16aDev *s16a_p, int value);
Arguments
s16a_p
value
S16A device handle returned from s16a_open
Value to write to the DIO Data register.
Return
Returns 0 on success or –1 on failure. Fails if s16a_p does not refer to an output channel. Sets errno on failure.
s16a_set_dio_direction_reg
Description
Write a specified value to the DIO Direction register. The low 12 bits configure the corresponding DIO pins.
If a bit is set, the DIO pin of the same number is configured as an output signal.
Syntax
int s16a_set_dio_direction_reg(S16aDev *s16a_p, int value);
Arguments
s16a_p
value
S16A device handle returned from s16a_open
Value to write to the DIO Direction register.
Return
Returns 0 on success or –1 on failure. Fails if s16a_p does not refer to an output channel. Sets errno on failure.
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Input and Output
s16a_set_output_bits
Description
Set the output resolution of the S16A to 16 or 20 bits.
Syntax
int s16a_set_output_bits(S16aDev *s16a_p, int value);
Arguments
s16a_p
value
S16A device handle returned from s16a_open
Either 16 or 20, indicating the operational mode of the output DAC.
Return
Returns 0 on success or –1 on failure. Fails if s16a_p does not refer to an output channel, or if value is
anything but 16 or 20. Sets errno on failure.
s16a_start_buffers
Description
Releases the specified number of buffers to the driver for transfer.
Syntax
int s16a_start_buffers(S16aDev *s16a_p, int bufnum);
Arguments
s16a_p
S16A device handle returned from s16a_open
bufnum
Number of buffers to release to the driver for transfer. An argument of 0 causes the driver
to perform continuous transfers.
Return
0 on success; –1 on error. If an error occurs, check the errno global variable for the error number.
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Input and Output
S16A User’s Guide
s16a_stop_buffers
Description
Stops DMA transfer after the current buffer has completed, whether DMA is occurring continuously or
noncontinuously. If DMA is continuous, also dismantles ring buffer mode and frees the resources it
consumed.
Syntax
int s16a_stop_buffers(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
0 on success; –1 on error. If an error occurs, check the errno global variable for the error number.
s16a_wait_for_buffer
Description
Blocks until the specified buffer is returned from the driver.
Syntax
void *s16a_wait_buffers(S16aDev *s16a_p, int bufnum);
Arguments
s16a_p
S16A device handle returned from s16a_open
bufnum
buffer number for which to block. Completed buffers are numbered cumulatively starting
with 0 when the S16A is opened. (Thus, the allocated buffer number is the transferred
buffer number modulo the number of allocated buffers.)
NOTE: If you wait for all the buffers, the driver is left with none to use when this call
returns, and an overrun or underrun will occur.
Return
Address of last completed buffer on success; NULL on error. If an error occurs, check the errno global
variable for more information.
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Input and Output
s16a_wait_for_next_buffer
Description
Blocks until the next buffer is returned from the driver. Returns immediately if a buffer is already complete.
The completed buffers are numbered consecutively, so the first call to s16a_wait_for_next_buffer returns the
address of buffer 0, the next will be 1, and so on.
Syntax
void *s16a_wait_next_buffer(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
Address of completed buffer on success; NULL on error. If an error occurs, check the errno global variable
for more information.
s16a_write
Description
Perform a write on the S16A. The UNIX 2 GB file offset bug is avoided during large amounts of input or
31
output; that is, writing past 2 does not fail. This call is not multibuffering, and no transfer is active when
it completes.
Syntax
int s16a_write(S16aDev *s16a_p, void *buf, int size);
Arguments
s16a_p
buf
S16A device handle returned from s16a_open
address of buffer to write from
size of write in bytes
size
Return
The return value from write; errno is set by write on error.
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Input and Output
S16A User’s Guide
foi_parity_error
Description
Checks to determine if a parity error has occurred since the last time this routine was called and returns 0
if not, 1 if so, and –1 if the routine is not supported for a particular device or an illegal argument was
provided.
Syntax
int foi_parity_error(S16aDev *s16a_p);
Arguments
s16a_p
S16A device handle returned from s16a_open
Return
0 if no error; 1 if parity error; –1 if the routine is not supported or if an illegal argument was provided.
Error Conditions
The table below shows some of the error codes that may be received from a call to the S16A driver. After
any I/ O system call, the errno global variable contains the error code, if any, and the perror system call can
print out a string describing the error code. Refer to your system programming documentation for details
about errno and perror.
Error Code
ENXIO
Failing Driver Call Error Condition
open
open
The S16A attach failed. The device is not present.
The S16A is already opened with an exclusive lock.
Table 3. Error Codes and Conditions
EEXIST
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S16A User’s Guide
Hardware Interface
Hardware Interface
This section describes how to connect your device to an S16A interface, including the electrical
characteristics of the signal, the signal descriptions, the timing specifications, and the connector pinout.
Electrical Interface
The two S16A analog inputs each have the following characteristics:
• 100 KOhm impedance
• configurable input sources:
· differential input signals
· either of the two differential leads (“plus” and “minus”) as a single-ended signal
· either of the analog outputs
· ground
• base input range: -2.5 to +2.5 volts
• input gain adjustments ranging from 1 to 100 power, in 7 steps
• offset and gain trim adjustments
The S16A analog outputs have the following characteristics:
• low impedance (70 Ohm)
• single-ended (non-differential) signals
• 20-bit precision
• range from -2.5 to +2.5 volts
• separate adjustable level offsets.
The S16A also provides 12 general-purpose I/ O pins, each of which can be configured as either input or
output. The outputs are TTL-level, high-impedance (1 KOhm); the inputs are TTL-level (0–5 volt)
compatible.
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Hardware Interface
S16A User’s Guide
Interface Signals
The following table describes the signals in the external connector.
Signal
S16A I/O Description
DIO00-11
CH0OUT
CH1OUT
CH0INP
I/O
O
O
I
Configurable I/O pins.
Output of channel 0.
Output of channel 1.
Channel 0 “plus” input. Configurable as one of a pair of differential signals,
the only single-ended signal, or disabled.
CH0INM
CH1INP
CH1INM
UVCC
I
I
Channel 0 “minus” input. Configurable as one of a pair of differential signals,
the only single-ended signal, or disabled.
Channel 1 “plus” input. Configurable as one of a pair of differential signals,
the only single-ended signal, or disabled.
I
Channel 1 “minus” input. Configurable as one of a pair of differential signals,
the only single-ended signal, or disabled.
O
Available +5 volt supply. Thermally fused for 200 mA, resets after cooling.
Table 4. S16A Interface Signals
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Hardware Interface
Connector Pinout
The S16A uses a 37-pin D connector, such as an AMP 748878-1.
The following pinout diagram describes the connection from the S16A board to the cable.
NOTE: Do not connect your own circuits to the unused pins, as they may be internally
connected to the S16A.
Pin
1
Signal
DIO00
Pin
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Signal
DIO01
2
DIO02
DIO03
3
Ground
DIO04
Ground
DIO05
4
5
DIO06
DIO07
6
Ground
DIO08
Ground
DIO09
7
8
DIO10
DIO11
9
Ground
CH0OUT
Ground
CH0INM
Ground
Reserved
Ground
CH1INM
Ground
Ground
UVCC
Ground
Ground
CH0INP
Ground
Reserved
Ground
CH1INP
Ground
CH1OUT
Ground
10
11
12
13
14
15
16
17
18
19
Table 5. Connector Pinout
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Registers
S16A User’s Guide
Registers
The S16A SBus 16-bit Dual Analog Interface is configured and controlled with 8-bit and 32-bit SBus
registers. Eleven additional internal registers in the Analog Input Module are accessed indirectly through
the SBus registers using a simple protocol. Applications access S16A registers through library calls or ioctl
calls with S16A-specific parameters, as described in the s16a.h header file.
NOTE: All registers initialized and manipulated by the S16A driver. User applications
do not ordinarily need to read or write these registers.
In addition, the S16A provides a standard SBus configuration ROM at the beginning of its block of
addresses. Thus the S16A answers with valid data for the first 64 KBytes, in addition to the SBus registers.
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S16A User’s Guide
Registers
SBus Addresses
The addresses listed in the figure below are offsets from the SBus slot base address. Obtain the SBus base
address from the SBus host documentation. The following sections describe the S16A registers in detail.
0x0006.0000
. . .
reserved
not used
0x0004.00C4
0x0004.00C0
. . .
uart_data
uart_csr
not used
0x0004.0080
. . .
dac_ctrl
not used
0x0004.0044
0x0004.0040
0x0004.003C
0x0004.0038
0x0004.0034
0x0004.0030
. . .
dio_data
dio_dir
nxt_cnt_ctl_3
cur_cnt_3
nxt_dma_add_3
cur_dma_add_3
. . .
0x0004.000C
0x0004.0008
0x0004.0004
0x0004.0000
. . .
nxt_cnt_ctl_0
cur_cnt_0
nxt_dma_add_0
cur_dma_add_0
not used
0x0002.0008
0x0002.0004
0x0002.0000
. . .
xpg_stat
xpg_din
xpg_reg
not used
not used
not used
not used
0x0000.FFFC
S16A ROM
0x0000.0000
Byte
0
1
2
3
Word
0
1
Figure 1. S16A SBus Addresses
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Registers
S16A User’s Guide
DMA Registers
The S16A provides four independent DMA channels: one each for input and output for each of the two
analog I/ O channels. Each DMA channel can be accessed to set up a new DMA transfer while it is currently
performing a DMA transfer. When the current transfer completes the new one begins automatically
without pause, allowing non-stop I/ O on both I/ O channels in both directions.
The following table shows the assignment of DMA channels to I/ O channels.
DMA Channel
Use
0
1
2
3
Analog I/O channel 0 Input
Analog I/O channel 1 Input
Analog I/O channel 0 Output
Analog I/O channel 1 Output
Table 6. DMA Channel Assignments
Current DMA Address Registers
The Current DMA Address registers are 32-bit read-only registers at addresses 0x40000, 0x40010, 0x40020,
and 0x40030, one for each DMA channel. The second-lowest hexadecimal address digit specifies the DMA
channel.
These registers hold the address of the DMA currently in progress for each channel. When the current DMA
transfer on a channel completes, if there is a “next” one set up, the contents of the Next DMA Address
register for the channel are copied to the Current DMA Address register, the next count is copied to the
Current DMA Count register, and the new transfer is started automatically.
Bit
Description
31–20
19–2
1–0
The 1 MB page addressed by the DMA.
When read, the next address to access on the SBus.
Always 0. S16A DMA transfers must be 32-bit word-aligned.
Table 7. Current DMA Address Registers
Next DMA Address Registers
The Next DMA Address registers are 32-bit registers at addresses 0x40004, 0x40014, 0x40024, and 0x40034,
one for each DMA channel. The second-lowest hexadecimal address digit specifies the DMA channel.
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Registers
These registers hold the address of the next DMA transfer to be performed for each channel. When the
current DMA transfer on a channel completes, if there is a “next” one set up, the contents of the Next DMA
Address register for the channel are copied to the Current DMA Address register, the next count is copied
to the Current DMA Count register, and the new transfer is started automatically.
Bit
Description
31–20
19–2
1–0
Show or store the 1 MB page addressed by the next DMA.
Show or store the address within the page for next DMA to use.
Set to 0. S16A DMA transfers must be 32-bit word-aligned.
Table 8. Next DMA Address Registers
Current Count Registers
The Current Count registers are 32-bit read-only registers at address 0x40008, 0x40018, 0x40028, and
0x40038, one for each channel. The second-lowest hexadecimal address digit specifies the DMA channel.
The maximum byte count for a single DMA transfer is 1 MB. Each of these registers reflects the counter for
the current DMA transfer in progress (if any) on it’s channel.
Bit
Description
31–20
19–2
Always 0.
When read, these bits display how many words remain in the DMA transfer currently in
progress.
1–0
Always 0. S16A DMA transfers consist of whole 32-bit words.
Table 9. Current Count Registers
Control and Next Count Registers
The Control And Next Count registers are 32-bit registers at address 0x4000C, 0x4001C, 0x4002C, and
0x4003C. The second-lowest hexadecimal address digit specifies the DMA channel. These registers provide
the transfer counts and control of the DMA hardware for each of the four DMA channels.
Bit
S16A_
Description
31
INT
A read-only status bit. A value of 1 indicates the S16A is asserting an SBus
interrupt.
30
29
28
27
26
25
Unused. 0 when read.
DMA_START
EN_EODMA
A value of 1 enables DMA transfer.
Unused. 0 when read.
A value of 1 enables end-of-DMA interrupt.
Unused. 0 when read.
DMA_DIR_READ DMA direction: a value of 1 reads host memory, 0 writes it. For channels 0
& 1 must be 0; for channels 2 & 3 must be 1.
Table 10. Control and Next Count Registers
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Registers
S16A User’s Guide
Bit
S16A_
Description
24
BURST_EN
A value of 1 enables burst transfer. For channels 0 & 1 must be 0; for
channels 2 & 3 must be 1.
23–20
19–2
Unused. 0 when read.
SIZ_MSK
Number of words to transfer in the next DMA transfer. When the next DMA
starts, this value is copied into the corresponding bits of the current count
register.
1–0
CNT_MSK
Always 0. S16A DMA transfers consist of whole 32-bit words.
Table 10. Control and Next Count Registers (Continued)
Direct I/O Registers
The S16A provides 12 pins in its external connector that can be used for general-purpose I/ O signals. Each
pin can be configured as either an input signal or an output signal. Signal levels are TTL-level (0 or +5 volt)
with 1 KOhm source impedance. The following sections describe how to access these signals.
DIO Direction Register
The DIO Direction register is a 32-bit register at address 0x40040. This register configures the 12 DIO pins
in the S16A connector to be either input or output. Each of the low 12 bits in this register controls the
corresponding DIO signal: if the bit is set, the pin is an output signal; if the bit is clear, the pin is an input
signal.
DIO Data Register
The DIO Data register is a 32-bit register at address 0x40044. The low 12 bits in this register reflect the state
of the corresponding DIO pins in the S16A connector. Writes to this register set the states of the pins that
have been configured to be output signals; reads return the states of the pins that have been configured to
be input signals.
DAC Output Control Register
The DAC Output Control register is a 32-bit register at address 0x40080. This register controls the output
analog converters. Each of the two channels’ output converters can be enabled or disabled, and can be
configured for 16-bit or 20-bit DAC operation. In 16-bit mode, each sample uses two bytes of DMA data; in
20-bit mode, each sample uses four bytes of DMA data.
Upon the first open of an I/ O channel for output, the driver enables the channel and configures it for 20-bit
operation. The operational mode can then be changed by a library or ioctl call after the channel is opened.
When the channel is closed, the driver clears the enable bit, disabling the output.
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S16A User’s Guide
Registers
Bit
0
S16A_
Description
OUT0_ENABLE
OUT0_20BIT
Enables I/O channel 0 output
1
When set, configures I/O channel 0 as 20-bit digital-to-analog; when clear,
the channel is in 16-bit mode.
4
5
OUT1_ENABLE
OUT1_20BIT
Enables I/O channel 1 output
When set, configures I/O channel 1 as 20-bit digital-to-analog; when clear,
the channel is in 16-bit mode.
Table 11. DAC Output Control Register
Analog Input Module Internal Registers
The Analog Input Module contains 11 internal registers, described in the following sections, that control the
analog input and other settings. These registers are accessed using the two UART registers described in the
section Analog Input Module UART Registers beginning on page 34.
Name
Description
Input Clock Prescale 0 In
Input Clock Prescale 1 In
Input Configuration 0 In
Input Configuration 1 In
Trim Output Offset 0
Trim Output Offset 1
Trim Input Gain 0
Trim Input Offset 0
Trim Input Gain 1
Trim Input Offset 1
Temperature
Provides a divisor from the base 192 KHz clock for input channel 0.
Provides a divisor from the base 192 KHz clock for input channel 1.
Controls the input source and the gain for input channel 0.
Controls the input source and the gain for input channel 1.
Controls the output voltage offset adjustment for output channel 0.
Controls the output voltage offset adjustment for output channel 1.
Controls the input gain adjustment for input channel 0.
Controls the input level offset adjustment for input channel 0.
Controls the input gain adjustment for input channel 1.
Controls the input level offset adjustment for input channel 1.
Two-byte register containing a 12-bit temperature reading for calibrating the
S16A for different operating temperatures.
Table 12. Analog Input Module Internal Registers
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Registers
S16A User’s Guide
Input Clock Prescale Registers
The Analog Input Module contains two 1-byte Input Clock Prescale registers (one for each input channel)
that provide 1-biased divisors for the input clock, which has a base rate of 192 KHz. The low 3 bits of these
registers are significant. Thus, the input sample rate for each channel is
192 KHz/(value + 1)
where
value
is the channel’s Input Clock Prescale register value, which can range from 0 to 7.
As Analog Input Module registers, these registers are accessed via the UART registers.
Input Configuration Registers
The Analog Input Module contains two two-byte Input Configuration registers, one each for the two input
channels. The low-order byte controls the input source; the high byte provides a primary gain control. The
following two tables list the useful values for the low and high bytes. One value from each table must be
chosen and bitwise ORed together to configure this register.
As Analog Input Module registers, these registers are accessed via the UART registers.
Value (hex)
AIN_
Description
xx42
DIFFERENTIAL Both input pins for this channel are monitored as a differential signal.
The “plus” input pin for this channel is monitored as a single-ended
xx48
PLUS_ONLY
signal.
The “minus” input pin for this channel is monitored as a single-ended
xx82
xx88
xx48
MINUS_ONLY
signal.
ZERO
The input is taken from ground. Used for offset calibration.
The “plus” signal from output channel 0 is monitored as a single-ended
signal.
OUT0_PLUS
The “minus” signal from output channel 0 is monitored as a single-ended
signal.
xx84
xx18
xx82
OUT0_MINUS
OUT1_PLUS
OUT1_MINUS
The “plus” signal from output channel 1 is monitored as a single-ended
signal.
The “minus” signal from output channel 1 is monitored as a single-ended
signal.
Table 13. Input Selection (Low Byte) Values
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Registers
Value (hex)
08xx
AIN_
X1
Description
Unit gain.
09xx
X2
Gain factor 2.
0Axx
X5
Gain factor 5.
0Cxx
X10_1
First gain factor 10. Uses the first-stage gain at maximum.
Second gain factor 10. Uses the second-stage 10 x gain.
Recommended for higher bandwidth.
10xx
X10_2
11xx
12xx
14xx
X20
X50
Gain factor 20.
Gain factor 50.
X100
Gain factor 100. Uses both stages at maximum.
Table 14. Input Gain (High Byte) Values
Trim Registers
The Analog Input Module contains six Digital-to-Analog converters (DACs) that control various trim
adjustments on the S16A. The analog input and output signals can be level-shifted, and the input signal
gains can be fine-tuned with these DACs. These trim DACs are controlled by six 8-bit trim registers. These
trim registers are set with the D command, described in Analog Input Module Control Protocol beginning
on page 34.
As Analog Input Module registers, these registers are accessed via the UART registers.
Trim Register Use
2
3
4
5
6
7
controls the output trim for analog I/ O channel 0
controls the output trim for analog I/ O channel 1
controls the input gain trim for analog I/ O channel 0
controls the input offset for analog I/ O channel 0
controls the input gain trim for analog I/ O channel 1
controls the input offset for analog I/ O channel 1
Table 15. Trim Registers
Trim Output Offset Registers
These two trim registers control a voltage offset for the output of each analog I/ O channel. Trim register 2
controls the output trim for analog I/ O channel 0; trim register 3 controls the output trim for channel 1.
The recommended procedure for adjusting these output trim registers is to first adjust one of the analog
I/ O channels’ input offset to be zero-calibrated by configuring its input to be ground and adjusting its input
offset while monitoring the input data for zero. After setting up one of the analog I/ O channels as a
calibrated input, reconfigure the analog I/ O channel input to monitor the analog I/ O channel output in
question. Finally, with all zeros for the output data, adjust the output trim until zeros are read in the input
channel.
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S16A User’s Guide
Trim Input Gain Registers
These two trim registers control the fine-tuning of the analog I/ O input gain. Trim register 4 controls the
gain trim for analog I/ O channel 0 input; trim register 6 controls the gain trim for channel 1 input. The input
offset should be set using a zero-level input signal before setting the input gain.
Trim Input Offset Registers
These two trim registers control the fine-tuning of the input gain. Trim register 5 controls the input offset
for analog I/ O channel 0; trim register 7 controls the input offset for analog I/ O channel 1.
The recommended procedure for adjusting these input trim registers is to connect it to the signal source, set
the source to generate a zero-level signal, and then adjust the input offset while monitoring the input data
for zero. The input offset trim should be set using a zero-level input signal before configuring the input gain
and input gain trim settings.
Temperature Register
The S16A contains an internal temperature probe that can be read via the Analog Input Module UART
interface to provide data for temperature-dependent calibration adjustments. This two-byte register returns
a 12-bit reading that can be converted to a Celsius temperature using the formula
C = ((5.0 * (r / 4096)) - 1.375) * 0.0225
where
r
is the raw temperature reading, and
is the resulting Celsius temperature.
C
As an Analog Input Module register, this register is accessed via the UART registers.
Analog Input Module UART Registers
The S16A Analog Input Module is configured and controlled by a byte stream protocol via two UART
registers on the SBus. Command sequences of bytes are sent to the module, which in turn responds with
byte sequences. Two interface registers, the UART CSR and the UART Data register, implement this byte
stream interface on the SBus.
Analog Input Module Control Protocol
All command and status sequences consist entirely of printable ASCII characters. Commands are case-
insensitive. The command character is always echoed; valid arguments are also echoed; invalid argument
characters are ignored. Commands are not terminated with a carriage return or newline: when the last
character of the command is sent, the command is immediately executed and the response string is sent
back.
34
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S16A User’s Guide
Registers
Write to a Clock Prescale Register
The clock prescale registers are written by sending a four-byte sequence beginning with W or w.
Wnmm
Write an 8-bit value to a Clock Prescale register.
n
Number of the Clock Prescale register to be written. 0 is input channel 0;
1 is input channel 1.
mm
Hexadecimal value to write to the register.
The UART responds with the four-character sequence return linefeed > space.
Write to an Input Configuration Register
The input configuration registers are written by sending a six-byte sequence beginning with W or w.
Wnmmmm Write a 16-bit value to an Input Configuration register.
n
Number of the Input Configuration register to be written. 2 is input
channel 0; 3 is input channel 1.
mmmm
Hexadecimal value to write to the register.
The UART responds with the four-character sequence return linefeed > space.
Read from a Clock Prescale Register
The Clock Prescale registers are read by sending a two-byte sequence beginning with R or r.
Rn
Read an 8-bit value from a Clock Prescale register.
n
Number of the Clock Prescale register to be read. 0 is input channel 0; 1
is input channel 1.
The UART responds with the six-character sequence xx return linefeed > space, where xx is the two-
character hexadecimal value read from the 8-bit register.
Read from an Input Configuration Register
The Input Configuration registers are read by sending a two-byte sequence beginning with R or r.
Rn
Read a 16-bit value from a Input Configuration register.
n
Number of the Input Configuration register to be written. 2 is input
channel 0; 3 is input channel 1.
The UART responds with the eight-character sequence xxxx return linefeed > space, where xxxx is the
four-character hexadecimal value read from the 16-bit register.
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Registers
S16A User’s Guide
Write to a Trim Register
The trim registers are written by sending a four-byte sequence beginning with D or w.
Dnmm
Write an 8-bit value to a trim register.
n
Number of the trim register to be written:
2
3
4
5
6
7
Output 0 offset
Output 1 offset
Input 0 gain trim
Input 0 offset
Input 1 gain trim
Input 1 offset
mm
Hexadecimal value to write to the register.
The UART responds with the four-character sequence return linefeed > space.
Read the Temperature Register
The Temperature register is read by sending a one-byte command: T or t.
T
Read the Temperature register.
The UART responds with the seven-character sequence xxx return linefeed > space, where xxx is the three-
character hexadecimal value. See Temperature Register beginning on page 34 for details on how to
interpret this value.
UART Command/Status Register
The UART CSR is an 8-bit register at 0400C0x. This register controls the serial byte-stream protocol used to
configure and control the internal analog input module.
Bit
S16A_
Description
7
UART_INT
A read-only status bit. A value of 1 indicates the S16A UART is asserting
an SBus interrupt.
6
5
Unused. 0 when read.
UART_TXBSY
UART_RXRDY
A read-only status bit. A value of 1 indicates the S16A UART is currently
transmitting a command byte to the analog input module. No other bytes
can be sent until this bit is clear.
4
A read-only status bit. A value of 1 indicates the S16A UART has received
a status byte from the analog input module. Valid status bytes can only be
read from the UART_DATA register when this bit is set.
3
UART_TXINT
UART_TXINT
A value of 1 enables the UART transmit complete interrupt.
A value of 1 enables the UART receive complete interrupt.
Unused. 0 when read.
2
1–0
Table 16. UART Command/Status Register
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Registers
UART Data Register
The UART Data register is and 8-bit register at address 0400C4x. This register provides the byte stream for
communicating with the analog input module. Write to this register (when the UART CSR indicates that it is
ready for a write) to send a byte to the Analog Input Module. Read this register to receive status bytes from
the Analog Input Module when the UART CSR indicates that a received byte is available.
Xilinx Programming Registers
The Xilinx programming registers are 3 8-bit registers at addresses 0x20000, 0x20004, and 0x20008. The
Xilinx chip is a programmable integrated circuit used to implement the S16A interface or to test the board.
NOTE: Any registers defined to control the interface reside in the Xilinx IC. In order to
access those registers, the S16A board requires that the Xilinx be loaded with a
program that defines them. If the Xilinx is not loaded, or loaded with an
incorrect program, those registers are inaccessible.
The Xilinx IC is programmed when the S16A driver is loaded. User applications
should not access the Xilinx registers.
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Specifications
S16A User’s Guide
Specifications
The SBus 16-bit Dual Analog Interface conforms to the following specifications.
SBus Compliance
Number of slots:
Transfer size
1
Input: 1 word per transfer
Output: 4 words per transfer
DVMA master
SBus memory space
Clock rate
approx. 320 KBytes
25 MHz
Software
Drivers for Sun OS Version 4.1.3 or later and System V Version 4 (Solaris 2.4 or later)
Power
5 V at 2 A
Environmental
Temperature Operating: 10 to 40 C
Nonoperating: –20 to 60 C
Humidity
Operating: 20 to 80% noncondensing at 40 C
Nonoperating: 95% noncondensing at 40 C
Physical
Dimensions
Weight
3.3" x 5.78" x 0.5"
3.5 oz.
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S16A User’s Guide
References
References
The following additional documentation may prove helpful.
Burr-Brown PCM1702 product specification, in Burr-Brown Integrated Circuits Data Book, Data Conversion
Products1995, pp. 8.2.108 to 8.2.115. Available from Burr-Brown Corporation, (800) 548-6132.
National Semiconductor ADC16071 product specification, in National Data Acquisition Databook 1995
Edition, pp. 2-672 to 2-689. Available from National Semiconductor Corporation, (800) 272-9959.
Sun SBus Specification B.0, part number 800-5323-05, available from Sun Microsystems, Inc., (415) 960-1300.
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Contacting EDT
S16A User’s Guide
Contacting EDT
Contact EDT directly at the following address or phone numbers:
Engineering Design Team, Inc.
1100 NW Compton Drive, Suite 306
Beaverton, Oregon 97006
Phone (503) 690-1234
FAX (503) 690-1243
In addition, a variety of services, from sales information to updated manuals to technical support, is
available through EDT’s World Wide Web site, at
If you have had the board for a period of time before installing it, we recommend you get the latest software
over the internet to ensure you have all the latest enhancements. You can either do this by accessing our
World Wide Web page, and selecting Technical Support, then Software, then specifying which operating
system version and driver to download. Alternately, you can use ftp to get the software directly using the
following procedure:
1. FTP to the EDT ftp server by typing
ftp ftp.edt.com
2. Login as anonymous. The password is your e-mail address.
3. Change to the appropriate directory for the version of the operating system you are running. If you
are running SunOS 4.1.3 or later, type
cd /pub/s16a/4x
If you are running SunOS 5.x (Solaris 2.4 or later), type
cd /pub/s16a/5x
4. Set binary transfer mode by typing
bin
5. Download the software and README file:
get EDTs16a.tar.Z
get README
6. Exit ftp:
quit
7. Follow the instructions in the README file to extract and install the software from the .Zfile.
The latest release of this manual is also available, via the World Wide Web site under Technical Support,
Manuals, or via ftp to ftp.edt.com in /pub/manuals/s16a.ps.Z (postscript format, compressed).
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S16A User’s Guide
Index
Installation
Index
hardware ....................................................2
software......................................................2
INT register bit ................................................29
A
ADC16071.
See
National
Semiconductor
M
ADC16071
Analog Input Module ........................................1
configuration & control........................15–16
internal registers........................................31
make file ............................................................3
MINUS_ONLY register bit ...............................32
N
B
National Semiconductor ADC16071....................1
product specification .................................39
Next DMA Address registers............................28
Burr-Brown PCM1702........................................1
product specification .................................39
BURST_EN register bit.....................................30
O
C
OUT0_20BIT register bit...................................31
OUT0_ENABLE register bit..............................31
OUT0_MINUS register bit................................32
OUT0_PLUS register bit...................................32
OUT1_20BIT register bit...................................31
OUT1_ENABLE register bit..............................31
OUT1_MINUS register bit................................32
OUT1_PLUS register bit...................................32
Connectors
37-pin D....................................................25
external.....................................................25
Control And Next Count registers ....................29
Current Count registers ...................................29
Current DMA Address registers .......................28
D
P
DAC Output Control register ...........................30
Device driver
PCM1702. See Burr-Brown PCM1702
installing.....................................................2
loading .......................................................3
multiple units..............................................3
unloading ...................................................3
DIFFERENTIAL register bit..............................32
DIO Data register ............................................30
DIO Direction register......................................30
Distribution diskette ......................................3, 4
DMA_DIR_READ register bit...........................29
DMA_START register bit .................................29
pkgadd command ...............................................4
PLUS_ONLY register bit ..................................32
R
References.......................................................39
Burr-Brown PCM1702 product specification 39
National Semiconductor ADC16071 product
specification ..................................39
SBus specification ......................................39
E
Electrical Interface ...........................................23
EN_EODMA register bit ..................................29
Error conditions
EEXIST .....................................................22
ENXIO......................................................22
I
Input Clock Prescale registers...........................32
Input Configuration registers ...........................32
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Index
S16A User’s Guide
Register bits
SBus
BURST_EN ...............................................30
configuration ROM....................................26
slot .............................................................2
DIFFERENTIAL ........................................32
DMA_DIR_READ .....................................29
DMA_START............................................29
EN_EODMA .............................................29
INT...........................................................29
MINUS_ONLY..........................................32
OUT0_20BIT .............................................31
OUT0_ENABLE ........................................31
OUT0_MINUS...........................................32
OUT0_PLUS..............................................32
OUT1_20BIT .............................................31
OUT1_ENABLE ........................................31
OUT1_MINUS...........................................32
OUT1_PLUS..............................................32
PLUS_ONLY.............................................32
UART_INT ...............................................36
UART_RXRDY..........................................36
UART_TXBSY ...........................................36
UART_TXINT ...........................................36
ZERO .......................................................32
Specifications
environmental...........................................38
humidity...................................................38
physical ....................................................38
power .......................................................38
SBus .........................................................39
size...........................................................38
temperature ..............................................38
weight ......................................................38
SunOS
Solaris 2.4....................................................4
SVR 4..........................................................4
Version 4.1.3................................................2
T
tar command .....................................................3
Temerature register .........................................34
Trim Input Gain registers.................................34
Trim Input Offset registers ...............................34
Trim Output Offset registers ............................33
Registers
Control And Next Count............................29
Current Count...........................................29
Current DMA Address ..............................28
DAC Output Control .................................30
DIO Data ..................................................30
DIO Direction............................................30
Input Clock Prescale ..................................32
Input Configuration...................................32
Next DMA Address ...................................28
Temerature ...............................................34
Trim Input Gain ........................................34
Trim Input Offset ......................................34
Trim Output Offset....................................33
UART Command/ Status ...........................36
UART Data ...............................................37
Xilinx Programming ..................................37
U
UART Command/ Status register .....................36
UART Data Register ........................................37
UART_INT register bit.....................................36
UART_RXRDY register bit ...............................36
UART_TXBSY register bit ................................36
UART_TXINT register bit ................................36
X
Xilinx Programming registers...........................37
Z
ZERO register bit.............................................32
S
s16a_get_dio_data_reg................................................ 13
s16a_get_dio_direction_reg ........................................ 13
s16a_get_output_bits.................................................. 14
s16a_serial_read.......................................................... 15
s16a_serial_str ............................................................ 16
s16a_serial_write ........................................................ 16
s16a_set_dac_control_reg........................................... 17
s16a_set_dio_data_reg................................................ 18
s16a_set_dio_direction_reg......................................... 18
s16a_set_output_bits .................................................. 19
s8a_set_mode .............................................................. 19
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