Scsi Adapter Programming; Scsi Adapter Configuration; Scsi Adapter Control; Specifcations - Compaq EN Series Technical Reference Manual

E.3

SCSI ADAPTER PROGRAMMING

E.3.1

SCSI ADAPTER CONFIGURATION

The Adaptec AHA-2940U SCSI 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.
Configuration is accomplished by BIOS during POST and re-configurable with software.
E.3.2

SCSI ADAPTER CONTROL

Control of the SCSI host adapter is affected through I/O mapped registers mapped as listed in
Table E-1.
Table E–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.
E.4

SPECIFCATIONS

The operating specifications are listed in Table E-2.
Table E–2. Ultra SCSI Host Adapter Card Specifications
Ultra SCSI Host Adapter Card Specifications
Operating Voltage
Maximum Current Draw
Operating Temperature
Table E-1.
Ultra SCSI Host Adapter Card
Control Register Mapping
Table E-2.
+5 VDC
2 A
32 F (0 C) to 131 F (55 C)
Original - April 1998
Technical Reference Guide
Compaq Personal Computers E-3