LSI 20860 User Manual
LSI20860 PCI to Ultra SCSI Host Adapter
A-1
Appendix A
Glossary of Terms and
Abbreviations
Glossary of Terms and
Abbreviations
Bus
A collection of unbroken signal lines across which information is
transmitted from one part of a computer system to another. Connections
to the bus are made using taps or connectors on the lines.
transmitted from one part of a computer system to another. Connections
to the bus are made using taps or connectors on the lines.
Bus Mastering
A high-performance way to transfer data. The host adapter controls the
transfer of data directly to and from system memory without bothering
the computer’s microprocessor. This is the fastest way for multitasking
operating systems to transfer data.
transfer of data directly to and from system memory without bothering
the computer’s microprocessor. This is the fastest way for multitasking
operating systems to transfer data.
Byte
A unit of information consisting of eight bits.
Chain
In computers, the linking together of two or more SCSI devices so that
they are dependent upon one another for operation.
they are dependent upon one another for operation.
Daisy Chain
A set of SCSI devices connected in a series. When devices are
daisy-chained to a microcomputer, the first device is connected to the
computer, the second device is connected to the first, and so on down
the line.
daisy-chained to a microcomputer, the first device is connected to the
computer, the second device is connected to the first, and so on down
the line.
Device Driver
A program that allows a microprocessor (through the operating system)
to direct the operation of a peripheral device.
to direct the operation of a peripheral device.
External SCSI
Device
Device
A SCSI device installed outside the computer cabinet. These devices are
connected in a continuous chain using specific types of shielded cables.
connected in a continuous chain using specific types of shielded cables.
FCC
Federal Communications Commission.
File
A named collection of information stored on a disk.
Hard Disk
A disk made of metal and permanently sealed into a drive cartridge. A
hard disk can store very large amounts of information.
hard disk can store very large amounts of information.
Host
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.
the SCSI host adapter to transfer information to and from devices
attached to the SCSI bus.