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Technical Reference Guide
Compaq Personal Computers
Original - April 1998
E-3
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
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
Table E-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)