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Datasheet: AHA-3940AU (Adaptec)

Enhanced Wide Scsi Bus Controllers (esbc)

 

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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
R
Installation Guide
AHA-3940AU/AUW
MultiChannel PCI-to-UltraSCSI Host Adapters
with SCSISelect Utility
1
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.
1
2
J3
J4
J6
J1
J2
J5
AHA-3940AU
2
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
J1
Internal 50-pin SCSI connector, Channel A
J2
Internal 50-pin SCSI connector, Channel B
J3
Multiple computer termination jumper, Channel A1
J4
Multiple computer termination jumper, Channel B1
J5
External LED connector
J6
External 50-pin SCSI connector, Channel B2
Location
Description
J1
Internal 68-pin SCSI connector, Channel A
J2
Internal 68-pin SCSI connector, Channel B
J3
External LED connector
J4
Internal 50-pin SCSI connector,Channel A
J5
External 68-pin SCSI connector, Channel B1
J6
Multiple computer termination jumper, Channel A2
J8
Multiple computer termination jumper, Channel B2
J5
J1
J4
J8
J6
AHA-3940AUW
J3
J2
3
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
7
SCSI Parity Checking
Enabled
Host Adapter SCSI Termination
Automatic
Boot Device Settings
Default Setting
Boot Channel
A First
Boot SCSI ID
0
Boot LUN Number1
0
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
3
4
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.
1
Remove the cover from the computer case.
2
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.
3
Remove the corresponding expansion slot cover
from the computer chassis and save the screw.
4
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.
5
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!
4
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