LSI Ultra160 Appendix A, Glossary of Terms and, Abbreviations, AIP, CRC, BIOS, Active, Master, DMA Bus, Termination, Conﬁguration, Device Driver, Differential SCSI

Appendix A

Glossary of Terms and

Abbreviations

Active	The electrical connection required at each end of the SCSI bus,
Termination	composed of active voltage regulation and a set of termination resistors.
	Ultra, Ultra2, and Ultra160 SCSI require active termination.
AIP	Asynchronous Information Protection (AIP) provides error checking for
	asynchronous, nondata phases of the SCSI bus.
BIOS	Basic Input/Output System. Software that provides basic read/write
	capability. Usually kept as ﬁrmware (ROM based). The system BIOS on
	the mainboard of a computer is used to boot and control the system. The
	SCSI BIOS on your host adapter acts as an extension of the system
	BIOS.
Conﬁguration	Refers to the way a computer is setup; the combined hardware
	components (computer, monitor, keyboard, and peripheral devices) that
	make up a computer system; or the software settings that allow the
	hardware components to communicate with each other.
CRC	Cyclic Redundancy Check (CRC) is an error detection code used in
	Ultra160 SCSI. Four bytes are transferred with the data to increase the
	reliability of data transfers. CRC is used on the Double Transition (DT)
	Data-In and DT Data-Out phases.
DMA Bus	A feature that allows a peripheral to control the ﬂow of data to and from
Master	system memory by blocks, as opposed to PIO (Programmed I/O) where
	the processor is in control and the ﬂow is by byte.
Device Driver	A program that allows a microprocessor (through the operating system)
	to direct the operation of a peripheral device.
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).

Ultra160 SCSI to PCI Host Adapters

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