AHA-3940AU/AUW Installation Guide
Part Number: 511418-00, Rev. A
Print Spec Number: 496346-00
Current Date: 3/12/97

ECN Date:3/10/97

Getting Started

This Installation Guide tells you how to install and con-
figure AHA

�

-3940AU/AUW PCI-to-UltraSCSI host

adapters. These host adapters have two SCSI chan-
nels which operate like two independent host adapters.
AHA-3940AU/AUW 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 compliant with
PCI 2.0 or higher and the motherboard BIOS must sup-
port PCI-to-PCI Bridges. If you are not sure whether
the motherboard BIOS supports PCI-to-PCI Bridges,
ask the motherboard or computer manufacturer.

The AHA-3940AU supports up to seven 8-bit SCSI
devices on each 8-bit SCSI channel. The
AHA-3940AUW supports up to fifteen 16-bit or 8-bit
SCSI devices on each 16-bit Wide SCSI channel; up to
seven of the devices can be 8-bit devices. Installation
procedures are the same for the AHA-3940AU and
the AHA-3940AUW.

Board Layout

The following diagrams and table show the major
AHA-3940AU, AHA-3940AUW components.

AHA-3940AU

AHA-3940AU/AUW Installation Guide
Part Number: 511418-00, Rev. A
Print Spec Number: 496346-00
Current Date: 3/12/97

ECN Date:3/10/97

1. See Termination in Multiple Computer Configurations on page 6.
2. High density 50-pin SCSI-2 connector.

1. High density 68-pin SCSI-2 connector.
2. See Termination in Multiple Computer Configurations on page 6.

Location

Description

Internal 50-pin SCSI connector, Channel A

Internal 50-pin SCSI connector, Channel B

Multiple computer termination jumper, Channel A1

Multiple computer termination jumper, Channel B1

External LED connector

External 50-pin SCSI connector, Channel B2

Location

Description

Internal 68-pin SCSI connector, Channel A

Internal 68-pin SCSI connector, Channel B

External LED connector

Internal 50-pin SCSI connector,Channel A

External 68-pin SCSI connector, Channel B1

Multiple computer termination jumper, Channel A2

Multiple computer termination jumper, Channel B2

AHA-3940AUW

AHA-3940AU/AUW Installation Guide
Part Number: 511418-00, Rev. A
Print Spec Number: 496346-00
Current Date: 3/12/97

ECN Date:3/10/97

Default Settings

AHA-3940AU/AUW host adapters operate cor-
rectly with their factory default settings in most com-
puters with PCI slots. The following table lists the
settings and their default values. You can change
these settings with the SCSISelect utility. (See
Configuring the Host Adapter on page 8.)

1. Setting is valid only if Multiple LUN Support is enabled.
2. Default Setting for the AHA-3940AU is 10 MBytes/sec.

Default Setting for the AHA-3940AUW is 20 MBytes/sec.

3. Ultra speed for the AHA-3940AU is 20 MBytes/sec.

Ultra speed for the AHA-3940AUW is 40 MBytes/sec.

4. AHA-3940AUW only
5. Settings are only valid if channel BIOS is enabled.

SCSI Bus Interface Definitions

Default Setting

Host Adapter SCSI ID

SCSI Parity Checking

Enabled

Host Adapter SCSI Termination

Automatic

Boot Device Settings

Default Setting

Boot Channel

A First

Boot SCSI ID

Boot LUN Number1

SCSI Device Configuration

Default Setting

Initiate Sync Negotiation

Yes (Enabled)

Maximum Sync Transfer Rate

10 MBytes/sec2,3

Enable Disconnection

Yes (Enabled)

Initiate Wide Negotiation4

Yes (Enabled)

Send Start Unit Command5

No (Disabled)

BIOS Multiple Lun Support 5

No (Disabled)

Include in BIOS Scan

Yes (Enabled)

Advanced Configuration Options

Default Setting

Plug and Play SCAM Support

Disabled

Reset SCSI Bus at IC Initialization

Enabled

Extended BIOS Translation for DOS Drives > 1 GByte5

Enabled

Host Adapter BIOS (Configuration Utility Reserves BIOS
Space)

Enabled

Support Removable Disks under BIOS as Fixed Disks5

Boot Only

Display <Ctrl-A> Message During BIOS Initialization5

Enabled

BIOS Support for Bootable CD-ROM5

Enabled

BIOS Support for Int 13h Extensions5

Enabled

AHA-3940AU/AUW Installation Guide
Part Number: 511418-00, Rev. A
Print Spec Number: 496346-00
Current Date: 3/12/97

ECN Date:3/10/97

Installing the Host Adapter

Inserting the Host Adapter in a PCI Slot

WARNING:

Turn

OFF

and disconnect the

power to your computer and attached
devices before you remove the computer
cover.

Remove the cover from the computer case.

Locate an unused PCI expansion slot that sup-
ports bus mastering. Make sure this slot is not
obstructed by other system hardware.

PCI bus slots are usually white or ivory and are
shorter than ISA or EISA slots. Usually there are
three PCI slots. One of these may be a shared slot.
That is, it may have an ISA or EISA connector and
a PCI connector, but only one kind of board can
be inserted in the slot at any one time.

Remove the corresponding expansion slot cover
from the computer chassis and save the screw.

Hold the host adapter directly over the bus mas-
ter PCI slot and insert the end of the board in the
card guide. Carefully press the bus connector on
the bottom of the host adapter down into the slot.

Attach the host adapter bracket to the computer
chassis with the screw from the expansion slot
cover that you removed.

Note:

Do not replace the computer cover or

reconnect the power yet!

Электронный компонент: AHA-3940AU