Lsi 20160 Manual do Utilizador descarregar pdf (Página 52)

A-4 Glossary of Terms and Abbreviations

IRQ Interrupt Request Channel. A path through which a device can get the

immediate attention of the computer’s CPU. The PCI bus assigns an IRQ

path for each SCSI host adapter.

ISA Industry Standard Architecture. A type of computer bus used in most

PCs. It allows devices to send and receive data up to 16 bits at a time.

Kbyte Kilobyte. A measure of computer storage equal to 1024 bytes.

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.

Logical Unit A subdivision, either logical or physical, of a SCSI device (actually the

place for the device on the SCSI bus). Most devices have only one

logical unit, but up to eight are allowed for each of the eight possible

devices on a SCSI bus.

LUN Logical Unit Number. An identiﬁer, zero to seven, for a logical unit.

LVDlink Low Voltage Differential link allows greater Ultra2 SCSI device

connectability and longer SCSI cables. LVDlink lowers the amplitude of

noise reﬂections and allows higher transmission frequencies. Detailed

information may be found in Section 1.5, “LVDlink™ Technology

Beneﬁts,” page 1-5.

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).

Mbyte Megabyte. A measure of computer storage equal to 1024 kilobytes.

Motherboard See Mainboard. In some countries, the term Motherboard is not

appropriate.

Multitasking The executing of more than one command at the same time. This allows

programs to operate in parallel.

Multithreading The simultaneous accessing of data by more than one SCSI device. This

increases the data throughput.

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