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NVRAM
NonVolatile Random Access Memory. Actually an EEPROM (Electronically Erasable Read
Only Memory chip) used to store configuration information. See EEPROM.
PCI and PCI-X
Peripheral Component Interconnect. A high performance local bus specification that allows
connection of devices directly to computer memory. The PCI Local Bus allows transparent
upgrades from 32-bit data path at 33 MHz to 64-bit data path at 33 MHz, and from 32-bit
data path at 66 MHz to 64-bit data path at 66 MHz.
Peripheral
Devices
A piece of hardware (such as a video monitor, disk drive, printer, or
CD-ROM) used with a computer and under the computer’s control. SCSI peripherals are
controlled through a SCSI SRCU42X controller (host adapter).
SCSI Bus
A storage adapter (host adapter) and one or more SCSI peripherals connected by cables in a
linear configuration. The adapter may exist anywhere on the bus, allowing connection of both
internal and external SCSI devices. A system may have more than one SCSI bus by using a
multi-channel adapter or by using multiple adapters.
SCSI Device
Any device that conforms to the SCSI standard and is attached to the SCSI bus by a SCSI
cable. This includes SCSI storage adapters (host adapters) and SCSI peripherals.
SCSI ID
A way to uniquely identify each SCSI device on the SCSI bus. Each SCSI bus has eight
available SCSI IDs numbered 0 through 7 (or 0 through 15 for Wide SCSI). The storage
adapter (host adapter) usually gets the highest ID (7 or 15) giving it priority to control the bus.
Single-Ended
SCSI
A hardware specification for connecting SCSI devices. It references each SCSI signal to a
common ground. This is the most common method (as opposed to differential SCSI, which
uses a separate ground for each signal).
TolerANT
A technology developed and used by Intel to improve data integrity, data transfer rates, and
noise immunity through the use of active negation and input signal filtering.
Ultra SCSI
A standard for SCSI data transfers. It allows a transfer rate of up to
20 Mbytes/s over an 8-bit SCSI bus and up to 40 Mbytes/s over a 16-bit SCSI bus.
Ultra2 SCSI
A standard for SCSI data transfers. It allows a transfer rate of up to
40 Mbytes/s over an 8-bit SCSI bus, and up to 80 Mbytes/s over a
16-bit SCSI bus.
Ultra160 SCSI
A standard for SCSI data transfers. It allows a transfer rate of up to 160 Mbytes/s over a 16-
bit SCSI bus.
Ultra320 SCSI
A standard for SCSI data transfers. It allows a transfer rate of up to 320 Mbytes/s over a 16-
bit SCSI bus.
VHDCI
Very High-Density Cable Interconnect. This cable is used to connect external connectors to
your storage adapter.
