Sun Microsystems S16A manual Overview

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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.

Input and Output

describes the programming interface library.

Hardware Interface Protocol

provides a connector pin-out diagram and describes the S16A signals

 

and timing.

Registers

describes the hardware registers.

Specifications

lists the product specifications.

References

lists other documentation resources that may be helpful.

Contacting EDT

describes how to contact EDT, and how to access EDT resources on the

 

Internet.

EDT, Inc. October, 1996

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Contents S16A EDT, Inc. October Contents Tables Overview Installing the Hardware InstallationInstalling the Software Using SunOS VersionS16A User’s Guide Installation Building the Sample Programs Using System V Release 4 Solaris 2.4 or LaterReadme Included FilesElements of S16A Applications Input and OutputGeneral DMA Library Routines DMA Library RoutinesRoutine Description S16A-specific Library Routines S16abufferaddressesSyntax ArgumentsS16achecknextbuffer S16acancelS16acancelcurrent S16aclose Arguments S16aconfigureringbuffersS16agetdaccontrolreg S16adoneS16agetdiodirectionreg S16agetdiodataregS16aopen S16agetoutputbitsS16aserialread S16areadS16aserialwrite S16aserialstrS16asetdaccontrolreg S16asetdefaultsS16asetdiodirectionreg S16asetdiodataregS16astartbuffers S16asetoutputbitsS16awaitforbuffer S16astopbuffersS16awrite S16awaitfornextbufferError Codes and Conditions Error ConditionsFoiparityerror Electrical Interface Hardware InterfaceS16A Interface Signals Interface SignalsSignal S16A I/O Description Connector Pinout Connector PinoutPin Signal Registers S16A ROM SBus AddressesNext DMA Address Registers DMA RegistersCurrent DMA Address Registers Control and Next Count Registers Current Count RegistersDAC Output Control Register Direct I/O RegistersDIO Direction Register DIO Data RegisterDAC Output Control Register Analog Input Module Internal RegistersName Description Analog Input Module Internal RegistersInput Clock Prescale Registers Input Configuration RegistersInput Gain High Byte Values Trim RegistersTrim Register Use Trim Registers Trim Output Offset RegistersAnalog Input Module Uart Registers Temperature RegisterAnalog Input Module Control Protocol Trim Input Gain RegistersRead from an Input Configuration Register Write to an Input Configuration RegisterWrite to a Clock Prescale Register Read from a Clock Prescale RegisterRead the Temperature Register Uart Command/Status RegisterUart Command/Status Register Write to a Trim RegisterUart Data Register Xilinx Programming RegistersSpecifications References Contacting EDT 15-16 IndexConfiguration ROM
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