Adaptec AHA-3940U Manuale utente

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.

J1 J2

AHA-3940U

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

AHA-3940UW

J1 J2 J3

AHA-3940UWD

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

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!

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.

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.

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.

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,

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.

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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