HP Xw8200 LSI 20320A-R PCI: Ultra 320 SCSI to PCI-X Host Adapters Users Guide - Page 40

Host Host Adapter Internal SCSI Device PCI and PCI-X Peripheral Device SCSI Bus SCSI Device SCSI ID Single-Ended SCSI The computer system in which a SCSI host adapter is installed. It uses the SCSI host adapter to transfer information to and from devices attached to the SCSI bus. A circuit board or integrated circuit that provides a device connection to the host. A SCSI device installed inside the computer cabinet. These devices are connected to one another with an unshielded ribbon cable. Peripheral Component Interconnect. A high performance local bus specification that allows connection of devices directly to computer memory. The PCI Local Bus allows transparent upgrades from a 32-bit data path at 33 MHz to a 64-bit data path at 33 MHz; from a 32-bit data path at 66 MHz to a 64-bit data path at 66 MHz; and from a 32-bit data path at 133 MHz to a 64-bit data path at 133 MHz (1064 Mbytes/s peak). A piece of hardware (such as a disk drive, printer, or CD-ROM) used with a computer and under the computer's control. SCSI peripheral devices are controlled through a SCSI host adapter. A host adapter and one or more SCSI devices connected by cables in a linear configuration. The host adapter may exist anywhere on the bus, allowing connection of both internal and external SCSI devices. A system may have more than one SCSI bus by using a multichannel host adapter or by using multiple host adapters. Any device that conforms to the SCSI standard and is attached to the SCSI bus by a SCSI cable. This includes SCSI host adapters, SCSI disk drives, SCSI CD-ROMS drives, and so on. An identifier that addresses specific devices on the SCSI bus and determines device selection when multiple devices contend for ownership of the SCSI bus. Wide SCSI buses support SCSI IDs 0 through 15, and narrow SCSI buses support SCSI IDs 0 through 7. A device gains ownership of the bus according to the priority of its SCSI ID. The order of priority, from highest to lowest, is: 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9. The host adapter is usually set to the highest priority SCSI ID, which is SCSI ID 7. A hardware specification for connecting SCSI devices. It references each SCSI signal to a common ground. In contrast, differential SCSI uses a separate ground for each signal. A-2 Glossary of Terms Version 2.1 Copyright © 2002-2003 by LSI Logic Corporation. All rights reserved.