Compaq 850 Scsi Adapter Programming Scsi Adapter Configuration, Scsi Adapter Control, Table L-1

Technical Reference Guide

L.3 SCSI ADAPTER PROGRAMMING

L.3.1 SCSI ADAPTER CONFIGURATION

The Adaptec SCSI Host Adapter Card is a PCI device and configured using PCI protocol and PCI Configuration Space registers (PCI addresses 00h-FFh) as discussed in Chapter 4 of this guide. Configuration is accomplished by BIOS during POST and re-configurable with software. The vender ID and device ID for the adapter are as follows:

Vender ID (PCI config. addr. 00h): 9005h

Device ID (PCI config, addr. 02h): 0080h

L.3.2 SCSI ADAPTER CONTROL

Control of the SCSI host adapter is affected through I/O mapped registers mapped as listed in Table L-1.

Table L–1.SCSI Host Adapter Card Control Register Mapping

	Table L-1.
	Ultra SCSI Host Adapter Card
	Control Register Mapping
I/O Addr.	Function
n00h-n1Fh	SCSI Register Array
n20h-n5Fh	Scratch RAM
n60h-n7Fh	Phase Engine (Sequencer)
n80h-n9Fh	Host Registers
n00h-nFFh	SCB Array

n = prefix address supplied by the BASEADR0 PCI Config. Reg.

L.4 SPECIFICATIONS

The operating specifications are listed in Table L-2.

Table L–2.Ultra SCSI Host Adapter Card Specifications

Table L-2.

Ultra SCSI Host Adapter Card Specifications

Operating Voltage	+5 VDC
Maximum Current Draw	2 A
Operating Temperature	32° F (0° C) to 131° F (55° C)

Compaq Personal Computers L-3

Original - December 2000