Adaptec AHA-3940U Installation Manual

1

Getting Started

This Installation Guide tells you how to install and con-
®
figure AHA -3940U/3940UW/3940UWD
PCI-to-UltraSCSI host adapters. These host adapters
have two SCSI channels which operate like two
independent host adapters. AHA-3940U/3940UW/
3940UWD host adapters are designed for computers
with PCI slots. PCI is a local bus interface that enables
high-speed data transfer. The computer in which you
install the host adapter must be PCI 2.0 or
PCI 2.1-compliant, and the motherboard BIOS must sup-
port PCI-to-PCI Bridges (PPB). If you're not sure
whether the motherboard BIOS supports PCI-to-PCI
Bridges, ask the motherboard or computer
manufacturer.
The AHA-3940U supports up to seven 8-bit SCSI
devices on each 8-bit SCSI channel. The
AHA-3940UW/3940UWD supports up to fifteen
16-bit or 8-bit SCSI devices on each 16-bit Wide SCSI
channel; up to seven of these can be 8-bit devices.
Installation procedures are the same for all three host
adapter models.
2

Board Layout

The following diagrams and table show the major
AHA-3940U, AHA-3940UW, and AHA-3940UWD
components.
AHA-3940U
J1
J6
J5
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AAAA A AAAA AAAA AAAA AAAA AAAA AAAA AAAA
A AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA
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AHA-3940U/3940UW/3940UWD Installation Guide
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Part Number: 511040-00, Rev. B
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Print Spec Number: 494568-00
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Current Date: 11/14/96
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
J2 J3
J4
AAAA AAAA AAAA AAAA AAAA AAAA AAA
AAAA AAAA AAAA AAAA AAAA AAAA AAA A
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ECN Date:11/18/96
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