Avago Technologies LSI20160 User Manual
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Glossary of Terms and Abbreviations
A-3
Copyright © 1993–2001 by LSI Logic Corporation. All rights reserved.
D
Device Driver
A software program designed to drive or operate a peripheral device
through a specific operating system. It is operating system and device
dependent.
Differential SCSI
A hardware configuration for connecting SCSI devices. It uses a pair of
lines for each signal transfer (as opposed to single-ended SCSI which
references each SCSI signal to a common ground.)
DMA
Direct Memory Access. The ability of an I/O system to transfer data to and
from a memory subsystem without CPU intervention.
DMA Bus
Master
A feature that allows a peripheral to control the flow of data to and from
system memory by blocks, as opposed to PIO (Programmed I/O) where
the flow is by byte. This feature has less of an impact on the CPU.
DMI
Distributed Management Interface. This is a remote management tool to
run across standard OS platforms to report on asset and configuration
information for adapters and devices.
Domain
Validation
Domain Validation is a software procedure in which a host queries a
device to determine its ability to communicate at the negotiated Ultra160
data rate.
Double
Transition
Clocking
In Double Transition (DT) Clocking data is sampled on both the asserting
and deasserting edge of the REQ/ACK signal. DT clocking may only be
implemented on an LVD SCSI bus.
E
EISA
Extended Industry Standard Architecture. An extension of the 16-bit ISA
bus standard. It allows devices to perform 32-bit data transfers.
External SCSI
Device
A SCSI device installed outside the computer cabinet. These devices are
connected in a continuous chain using specific types of shielded cables.
Fast SCSI
A standard for SCSI data transfers. It allows a transfer rate of up to
10 Mbytes/s over an 8-bit SCSI bus and up to 20 Mbytes/s over a 16-bit
SCSI bus.
F
File
A named collection of information stored on a disk.