Installation Guide AHA-3940AU/AUW MultiChannel PCI-to-UltraSCSI Host Adapters with SCSISelect Utility R AHA-3940AU/AUW Installation Guide Part Number: 511418-00, Rev.
1 Getting Started This Installation Guide tells you how to install and configure AHA®-3940AU/AUW PCI-to-UltraSCSI host adapters. These host adapters have two SCSI channels 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 support PCI-to-PCI Bridges.
Location Description J1 Internal 50-pin SCSI connector, Channel A J2 Internal 50-pin SCSI connector, Channel B J3 J4 Multiple computer termination jumper, Channel A1 Multiple computer termination jumper, Channel B1 J5 External LED connector J6 External 50-pin SCSI connector, Channel B2 1. See Termination in Multiple Computer Configurations on page 6. 2. High density 50-pin SCSI-2 connector.
3 Default Settings AHA-3940AU/AUW 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.
4 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 supports 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.
5 Connecting SCSI Devices Caution: AHA-3940AU/AUW 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 documentation 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.
If you want to connect only SCSI-1 or SCSI-2 devices (no UltraSCSI devices), the maximum total cable length 6 meters (19.7 feet). If you want to connect 4 or fewer UltraSCSI devices, the maximum total cable length is 3 meters (9.8 feet). For configurations with 5 or more UltraSCSI devices, maximum total cable length is 1.5 meters(4.9 feet). See your device’s documentation to determine whether it is an UltraSCSI device.
or on jumper J8 if the second computer is connected to SCSI Channel B. 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-3940AU/AUW host adapter. See your SCSI device documentation to learn how to determine the ID and change it.
Note: The PCI bus is supposed to automatically 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 message includes a list of installed SCSI devices and information about the BIOS.
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, Initiate Wide Negotiation(for 3940AUW only), Send Start Unit Command, BIOS Multiple LUN Support, and Include In BIOS Scan. These settings apply to individual SCSI devices.
You can make the host adapter treat removablemedia 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.
PCI-to-PCI Bridges (PPB)? If not, contact your computer manufacturer for a BIOS upgrade. ■ 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 channel assignment.
Adaptec Technical Support and Services If you have questions about installing or using your Adaptec product, check this document first—you will find answers to most of your questions here. If you need further assistance, please contact us.
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.
