Avago Technologies LSI53C140 - Manual (Page 73)

Glossary C-5
Ver. 2.1 Copyright © 1998–2001 by LSI Logic Corporation. All rights reserved.
Priority The ranking of the devices on the bus during arbitration.
Protocol A convention for data transmission that encompasses timing control,
formatting, and data representation.
Receiver The circuitry that receives electrical signals on a line.
Reconnect The function that occurs when a target reselects an initiator to continue an
operation after a disconnect.
Release The act of allowing the cable terminators to bias the signal to the false
state (by placing the driver in the high impedance condition).
REQ/ Request – Driven by a target, indicates a request for a SCSI data-transfer
handshake. This signal is received by the initiator.
Reselect A target can disconnect from an initiator in order to perform a time-
consuming function, such as a disk seek. After performing the operation,
the target can “reselect” the initiator.
RESET Reset – Clears all internal registers when active. It does not assert the
SCSI RST/ signal and therefore does not reset the SCSI bus.
RST Reset – Indicates a SCSI Bus reset condition.
SCSI Small Computer System Interface.
SCSI Address The octal representation of the unique address ([7:0]) assigned to a SCSI
device. This address is normally assigned and set in the SCSI device
during system installation.
SCSI ID
Identification)
or SCSI Device
ID The bit-significant representation of the SCSI address referring to one of
the signal lines DB7/ through DB0/.
SCAM An acronym for SCSI Configured AutoMatically. SCAM is the new SCSI
automatic ID assignment protocol. SCAM frees SCSI users from locating
and setting SCSI ID switches and jumpers. SCAM is the key part of Plug
and Play SCSI.
SDTR Synchronous Data Transfer Request messages are used to negotiate a
synchronous data transfer agreement between two SCSI devices. An
SDTR agreement applies to all logical units of the two SCSI devices that
negotiated agreement.
SEL/ Select – Used by an initiator to select a target, or by a target to reselect an
initiator.