Domain

Domain Validation is a software procedure in which a host queries a

Validation

device to determine its ability to communicate at the negotiated Ultra160

 

data rate.

Double

In Double Transition (DT) Clocking, data is sampled on both the asserting

Transition

and deasserting edge of the REQ/ACK signal. DT clocking may only be

Clocking

implemented on an LVD SCSI bus.

EEPROM

Electronically Erasable Programmable Read Only Memory. A memory

 

chip typically used to store configuration information. See NVRAM.

External SCSI

A SCSI device installed outside the computer cabinet. These devices are

Device

connected in a continuous chain using specific types of shielded cables.

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.

Host Adapter

A circuit board or integrated circuit that provides a SCSI bus connection

 

to the computer system.

Internal SCSI

A SCSI device installed inside the computer cabinet. These devices are

Device

connected in a continuous chain using an unshielded ribbon cable.

Local Bus

A way to connect peripherals directly to computer memory. It bypasses

 

the slower ISA and EISA buses. PCI is a local bus standard.

Mainboard

A large circuit board that holds RAM, ROM, the microprocessor, custom

 

integrated circuits, and other components that make a computer work. It

 

also has expansion slots for host adapters and other expansion boards.

Main Memory

The part of a computer’s memory which is directly accessible by the CPU

 

(usually synonymous with RAM).

NVRAM

NonVolatile Random Access Memory. Actually an EEPROM

 

(Electronically Erasable Read Only Memory chip) used to store

 

configuration information. See EEPROM.

PCI

Peripheral Component Interconnect. A local bus specification that allows

 

connection of peripherals directly to computer memory. It bypasses the

 

slower ISA and EISA buses.

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Glossary of Terms and Abbreviations