LSI Ultra160 - Manual (Page 46)

A-2 Glossary of Terms and Abbreviations
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.
EEPROM Electronically Erasable Programmable Read Only Memory. A memory
chip typically used to store configuration information. See NVRAM.
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.
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
Device A SCSI device installed inside the computer cabinet. These devices are
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.