| 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 |
| |
| 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. |
Glossary of Terms and Abbreviations |
Copyright © 2001 by LSI Logic Corporation. All rights reserved.