Adaptec AHA-3940U User manual

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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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.
Board Layout
The following diagrams and table show the major
AHA-3940U, AHA-3940UW, and AHA-3940UWD
components.
1
2
J1 J2
J6
J5
J3
J4
AHA-3940U

2
AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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1 This isa 68-pin connector on the AHA-3940UW/3940UWD and a 50-pin
connector on the AHA-3940U.
2 See Termination in Multiple Computer Configurations onpage 6.
3 50-pin connector on the AHA-3940U, and 68-pin connector on the
AHA-3940UW/3940UWD.
4 68-pin connector,very high density
Location Description
J1 Internal SCSIconnector, Channel A1
J2 Internal SCSIconnector, Channel B1
J3 Multiple computer termination jumper, Channel B2
J4 External LED connector
J5 AHA-3940U/3940UW: External SCSIconnector, Channel A3
AHA-3940UWD: External SCSI connector, Channel B4
J6 Multiple computer termination jumper, Channel A2
J7 AHA-3940UWD only:External SCSI connector, ChannelA
J1 J2
J5
J3
J4
J6
AHA-3940UW
J1 J2 J3
J4
J6
J7
J5
AHA-3940UWD

3
AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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Default Setting
AHA-3940U/3940UW/3940UWD host adapters
operate correctly with their factory default settings
in most computers 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.)
1Setting isvalid only if Multiple LUNSupportis enabled.
210 MBytes/secfor AHA-3940U.
3AHA-3940UW/3940UWD only.
4Settings are onlyvalid if channel BIOS is enabled.
5 If this setting is changed to Enabled, the Maximum Sync Transfer Rates are
20 MBytes/sec for the AHA-3940U and 40 MBytes/sec for the AHA-3940UW/
3940UWD.
Global Settings for Host Adapter Default Setting
HostAdapterSCSI ID 7
SCSI ParityChecking Enabled
HostAdapterSCSI Termination Automatic
Boot Device Settings Default Setting
BootChannel A First
Boot Target ID 0
BootLUNNumber10
SCSI Device Settings Default Setting
InitiateSync Negotiation Yes (Enabled)
MaximumSync Transfer Rate 20 MBytes/sec2
Enable Disconnection Yes (Enabled)
InitiateWide Negotiation3Yes (Enabled)
Send StartUnitSCSICommand4No (Disabled)
AdvancedHost Adapter Settings Default Setting
Plug and Play SCAM Support Disabled
Channel BIOS Enabled
Support Removable Disksunder BIOS as Fixed Disks4Boot Only
Extended BIOS Translation forDOS Drives > 1GByte4Enabled
Display<Ctrl-A> Message During BIOS Initialization4Enabled
Multiple LUNSupport4Disabled
BIOS Support for BootableCD-ROM4Enabled
BIOS Support for Int 13h Extensions4Enabled
Support for UltraSCSISpeed5Disabled
3

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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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 chassis cover.
1Remove the cover from the computer case.
2Locate 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.
3Remove the corresponding expansion slot cover
from the computer chassis and save the screw.
4Hold 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.
5Attach the host adapter bracket to the computer
chassis with the screw from the expansion slot
cover that you removed.
Note: Do not replace the chassis cover or
reconnect the power yet!
4

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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Connecting SCSI Devices
Caution: AHA-3940U/3940UW/3940UWD
host adapters support only single-ended SCSI
devices. Do not connect differential SCSI
devices, because they may damage the host
adapter. Read the SCSI device documenta-
tion if you are not sure whether the device is
single-ended or differential.
Connecting Cables
SCSI devices are cabled together in a single,
connected series called the SCSI bus. SCSI cables
must run sequentially from one device to the next,
with no branching.
1Lay out the cables and find the pin-1 element of
each cable and device connector.
On internal cables, pin 1 is usually marked with a
contrasting color on one edge of the ribbon cable,
and a small triangle or number 1marks pin 1 on
the SCSI connector. External cables can only be
plugged in one way, so pin-1 orientation is
automatic.
2Attach the SCSI cable(s) to the host adapter and
the device(s), using the internal and/or external
connector(s). Be sure to maintain correct pin-1 ori-
entation throughout the bus for each channel. If
you are connecting 8-bit SCSI devices to either
channel of an AHA-3940UW or AHA-3940UWD,
you will need 68-pin-to-50-pin converters. Refer
to the User’s Guide for detailed information.
On the AHA-3940U/3940UW host adapters, SCSI
Channel A has one external and one internal
connector. These are labeled J5 and J1, respec-
tively, in the diagrams on pages 1 and 2. SCSI
Channel B has an internal connector only (J2).
The AHA-3940UWD host adapter has two
external connectors (J7 and J5) and two internal
connectors (J1 and J2) — one of each type of
connector for each channel.
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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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When any UltraSCSI devices are connected to the
host adapter and configured to run at UltraSCSI
speed, the total length of all cables on the same
channel (internal and external) must not exceed 3
meters (9.8 feet) to ensure reliable operation.
When no UltraSCSI devices are connected, the
total length of all cables must not exceed 6 meters
(19.7 feet). See your device’s documentation to
determine whether it is an UltraSCSI device.
Terminating the SCSI Bus
The last physical SCSI device on each end of the SCSI
bus must be terminated. Termination must be
disabled on all other devices in the middle of the
SCSI bus. You may need to change the termination
setting on some devices in your computer system.
Terminating the Host Adapter
Host adapter termination is controlled by the
SCSISelect utility. The default setting is Automatic,
which works like this:
■For Channel A on the AHA-3940U/3940UW, and
both channels on the AHA-3940UWD, if the host
adapter detects that a device is connected to its
internal and external connectors, it disables its
terminators. Otherwise, the terminators are
enabled.
■For Channel B on the AHA-3940U/3940UW,
Automatic mode is the same as Enable mode.
If you need to change host adapter termination, com-
plete the physical installation, then run SCSISelect as
described in Configuring the Host Adapter on page 8.
Termination in Multiple Computer Configurations
If you are setting up your SCSI bus so that SCSI
devices are shared by host adapters in two different
computers, you can enable your host adapter to pro-
vide termination power even when one computer is
powered OFF. To do this, place a jumper shunt on
jumper J6 if the second computer is connected to
SCSI Channel A or on jumper J3 if the second com-
puter is connected to SCSI Channel B.

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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This feature works only when one computer is
turned off, and the other computer connected to the
same SCSI bus accesses the disk drives and other
SCSI devices on the bus.
Setting SCSI IDs
You must assign a different SCSI ID to each device on
the SCSI bus connected to the AHA-3940U/
3940UW/3940UWD host adapter. See your SCSI
device documentation to learn how to determine the
ID and change it.
■ID 7 is the default SCSI ID for the host adapter on
both SCSI Channels A and B. You can change the
ID(s) in SCSISelect, if necessary. See Configuring
the Host Adapter on page 8.
■SCSI devices connected to an AHA-3940U can
have IDs from 0 to 7. SCSI devices connected to
an AHA-3940UW or AHA-3940UWD can have
IDs from 0 to 15. (The host adapter itself uses one
SCSI ID on each channel.)
■The SCSI IDs on one SCSI channel do not interfere
with the IDs on another SCSI channel.
■If you have two host adapters connected to the
same SCSI bus, be sure to assign them different
SCSI IDs, preferably IDs 7 and 6.
Completing the Installation
1Put the chassis cover back on the computer,
following the directions in the documentation.
2Be sure all power switches are OFF, then recon-
nect power cables to your computer.
3Turn ON the power for the computer and the
peripheral device(s).
4If your system CMOS Setup requires you to
enable PCI bus parameters, do so now. Refer to
your computer documentation.
6

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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Note: The PCI bus is supposed to automati-
cally assign Interrupt channels (IRQs) and
port addresses. But because PCI is currently
combined with other bus architectures such
as ISA and EISA, you may need to edit the
PCI bus parameters in your CMOS Setup .
When the computer boots, the host adapter BIOS
sign-on message appears on the screen. This mes-
sage includes a list of installed SCSI devices and
information about the BIOS. In most cases your com-
puter, host adapter, and SCSI devices are ready to
use, and you do not need to run SCSISelect.
Configuring the Host Adapter
Your AHA-3940U/3940UW/3940UWD host
adapter includes the built-in SCSISelect configura-
tion utility. SCSISelect lets you change host adapter
settings, such as SCSI Parity Checking and Host
Adapter SCSI ID, without opening your computer or
flipping switches.
To run SCSISelect, press Ctrl-A immediately when
the SCSISelect message appears on the screen at the
time your computer boots.
Use the arrow (↑↓) and Enter keys to make selec-
tions in the SCSISelect Options menu. Press Esc at
any time to return to the previous menu. You can
press F6 to restore the original default settings. To
abandon changes you made in the Configure/View
Host Adapter Settings menu, press Esc and select No
when asked if you want to save the changes.
The first SCSISelect screen asks you to choose SCSI
Channel A or Channel B. You can only configure one
SCSI channel at a time. If you have multiple host
adapters, the screen displays a list of SCSI channels
for all installed host adapters.
Configure/View Host Adapter Settings
The Configuration screen displays the basic options
for each SCSI channel: Host Adapter SCSI ID, SCSI
Parity Checking, Host Adapter SCSI Termination,
7

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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Boot Device Options, SCSI Device Configuration,
and Advanced Configuration Options. Highlight an
option and press Enter to see a list of possible values.
Select SCSI Device Configuration to see a menu of
the following options for each device on the SCSI
bus: Initiate Sync Negotiation, Maximum Sync
Transfer Rate, Enable Disconnection, Send Start
Unit Command, and Initiate Wide Negotiation
(AHA-3940UW/3940UWD only). These settings
apply to individual SCSI devices.
Select Advanced Configuration Options for a menu
that includes these advanced options: Channel BIOS
(Configuration Utility Reserves BIOS Space), Sup-
port Removable Disks as Fixed Disks, and Extended
BIOS Translation for DOS Drives > 1 GByte.
SCSI Disk Utilities
When you select SCSI Disk Utilities from the
Options menu, a list of installed SCSI devices
appears. When you select a device the Utilities menu
appears, giving you the following two choices:
■Format Disk—runs the Adaptec SCSI low-level
format utility. Most SCSI devices are preformatted
and do not need to be formatted again.
■Verify Disk Media—scans the selected device’s
media for defects. If bad blocks are found, you are
prompted to reassign them; if you select Yes,
those blocks are no longer used.
Operating System Software
Your host adapter is supported by the following
operatingsystems: DOS, Windows 3.x, Windows 95,
Windows NT, Novell NetWare, OS/2, Unix, and
UnixWare.
Under MS-DOS 5.0 or later, you can install up to
eight hard disk drives (SCSI or non-SCSI) in your
computer without using additional software. Older
versions of DOS support up to two hard disk drives.
8

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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You can make the host adapter treat removable-
media drives as hard disk drives. To do this, run the
SCSISelect utility, select Advanced Configuration
Options, and set the Support Removable Disks
Under BIOS as Fixed Disks option to All Disks.
Caution: If you use this setting, you cannot
remove media while your computer is ON.
You need additional software if you want to do the
following (contact Adaptec for additional drivers):
■Use devices other than hard disk drives, such as
SCSI tape drives, CD-ROM drives, scanners, etc.
■Remove and insert CD-ROM discs and other
removable media while your computer is running
■Support more than eight hard disk drives under
MS-DOS 5.0 or later
Adaptec EZ-SCSISoftware
Adaptec EZ-SCSI software for DOS, Windows 3.x,
Windows 95,and Windows NT™is included in the
kitted version. Use the menu-driven software to
install drivers and configure your DOS/Windows
operating system automatically.
Other Operating Environments
AHA-3940U/3940UW/3940UWD host adapters sup-
port Novell NetWare, OS/2, SCO Unix, and SCO
UnixWare operating systems. The Adaptec 7800
Family Manager Set is included in the kitted version
so that you can install the appropriate driver for your
system. Refer to the Adaptec 7800 Family Manager Set
User’s Guide (included) for detailed information.
Troubleshooting Checklist
If you have a problem during installation, check
these items first:
■Is your computer PCI 2.0 or PCI 2.1-compliant,
and does the motherboard BIOS support PCI-to-
PCI Bridges (PPB)? If not, contact your computer
manufacturer for a BIOS upgrade.
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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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■Are all SCSI devices powered?
■Are all SCSI bus cables and power cables properly
connected?
■Does the host adapter and each device on each
SCSI bus channel have a unique SCSI ID?
■Are all devices on the SCSI bus terminated
properly?
■Does your system CMOS Setup require you to
enable PCI bus parameters? If so, see your
computer documentation. Confirm the IRQ chan-
nel assignment.
■Is the host adapter installed in a PCI slot that sup-
ports bus mastering? Refer to your computer doc-
umentation or move the host adapter to a
different PCI slot.
Computer Will Not Boot from a SCSI Disk Drive
If both SCSI and non-SCSI disk drives are installed in
your computer, the non-SCSI drive is always the boot
device. If the computer has only SCSI disk drives,
check the following:
1Make sure your computer’s CMOS Setup is set to
No Drives Installed.
2Make sure the boot partition of the boot hard disk
is active. (The SCSI ID is usually set with jumpers
or switches on the drive.)
3Partition the disk. See the Operating System usre’s
guide for instructions.
If this does not solve the problem, there are more
suggestions in chapter 5 of the User’s Guide. As a last
resort, you can back up all data on the SCSI hard disk
and perform a low-level format with the SCSISelect
Format Disk
option.

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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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Adaptec Technical Support and
Services
If you have questions about installing or using your Adaptec
product, check this installation guide first—you will find answers
to most of your questions here. If you need further assistance,
please contact us. We offer the following support and information
services:
Electronic Support
Technical information, including product literature, answers to
commonly asked questions, information on software upgrades
and other topics is available electronically through the following:
■Adaptec World Wide Web (WWW) site at
http://www.adaptec.com.
■File Transfer Protocol (FTP) server at ftp.adaptec.com.
■CompuServe Adaptec Forum at GO ADAPTEC.
■Adaptec USA Bulletin Board Service (BBS) at 408-945-7727;
supports up to 28,800 bps (bits per second), 8 data bits, 1 stop
bit, no parity. No product literature is available on the Adaptec
BBS.
■Interactive Fax System at 408-957-7150.
Technical and Product Support
■For technical support and information about many of
Adaptec’s electronic support services, call 800-959-7274 or
408-945-2550, 24 hours a day, 7 days a week.
■To use the Adaptec Interactive Support System, call
800-959-7274 or 408-945-2550, 24 hours a day, 7 days a week
The system prompts you with questions regarding your
problem and then provides step-by-step troubleshooting
instructions.
■To speak with a product support representative, call
408-934-7274, M–F, 6:00 A.M. to 5:00 P.M., Pacific Time. After
hours, on weekends, and on holidays, product support is also
available for a fee at 800-416-8066.
Sales and Ordering Information
■For sales information, call 800-959-7274 or 408-945-2550, M–F,
6:00 A.M. to 5:00 P.M., Pacific Time.
■To order Adaptec software and SCSI cables, call 800-442-7274
or 408-957-7274, M–F, 6:00 A.M. to 5:00 P.M., Pacific Time.
■To request additional documentation for Adaptec products,
call 800-934-2766 or 510-732-3829, M–F, 6:00 A.M. to 5:00 P.M.,
Pacific Time.
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AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECNDate:11/18/96
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Federal Communications Commission Radio Frequency
Interference Statement
WARNING: Changes or modifications to this unit not expressly approved
by the party responsible for compliance could void the user’s authority to
operate the equipment.
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate
radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communica-
tions. However, there is no guarantee that interference will not occur in a
particular installation. However, if this equipment does cause interference
to radio or television equipment reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to
which the receiver is connected.
• Consult the dealer or an experienced radio/television technician for
help.
Use a shielded and properly grounded I/O cable and power cable to ensure
compliance of this unit to the specified limits of the rules.
This device complies with part 15 of the FCC rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful interfer-
ence and (2) this device must accept any interference received, including
interference that may cause undesired operation.
Canadian Compliance Statement
This Class B digital apparatus meets all requirements of the Canadian Inter-
ference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du
Règlement sur le matérial brouilleur du Canada.
Adaptec, Inc.
691 South Milpitas Blvd.
Milpitas, CA 95035
Copyright © 1996, Adaptec, Inc. All rights reserved. Adaptec, the
Adaptec logo, AHA, and EZ-SCSI are trademarks of Adaptec, Inc.
which may be registered in some jurisdictions. Windows NT is a
trademark, and Windows and Windows 95 are registered trade-
marks of Microsoft Corporation used under license. All other
trademarks used are owned by their respective owners.
Printed in Singapore
Stock No.: 511040-00, Rev. B MR 11/96
Information subject to change without notice.

AHA-3940U/3940UW/3940UWD Installation Guide
Part Number: 511040-00, Rev. B
Print Spec Number: 494568-00
Current Date: 11/14/96 ECN Date: 11/18/96
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R
Installation Guide
AHA-3940U/3940UW/
3940UWD
MultiChannel PCI-to-UltraSCSI Host Adapters
with SCSISelect Utility