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Bus Condition .......... This is an asynchronous condition for changing the status transition on the SCSI
bus. There are two types, the ATTENTION condition and the RESET condition.
Bus Phase................. This is the name given to the SCSI bus state. The SCSI bus is in one state or
another, the BUS FREE phase, the ARBITRATION phase, the SELECT phase,
the RESELECTION phase or the INFORMATION TRANSFER phase. In
addition, the INFORMATION TRANSFER phase is subdivided into the DATA
IN, DATA OUT, COMMAND, STATUS, MESSAGE AND MESSAGE OUT
phases in accordance with the type of information being transferred in the
INFORMATION TRANSFER phase.
CCS ........................ Common Command Set
This is the standard form of SCSI logical specifications stipulated by the
operations subcommittee of the American National Standards Institute (ANSI)
which stipulates functions which a direct access device (magnetic disk, etc.)
should support.
CDB ........................ Command Descriptor Block
A series of data which describes commands related to input/output operations,
sent from the initiator to the target.
Command................. This is a command to a target to perform an input/output operation, and it is
described as the CDB.
Disconnect................ This is processing which temporarily frees the connected state of the target with
the SCSI bus and the initiator at the point in the target's command processing
execution process when operations on the SCSI bus are not needed.
Initiator (INIT) ........ This is a SCSI device which initiates input and output operations on the SCSI
bus. In this manual, initiator has been abbreviated to "INIT."
Logical Unit ............. This is the device unit which is the object of input/output operations on the SCSI
bus.
LUN ........................ Logical Unit Number
This is the serial number which identifies a logical unit.
Message ................... This is control information that is delivered and received between the initiators
and targets operating on the SCSI bus for controlling a series of bus phases and
input/output operation execution sequences.
Reconnect................. For a target which has executed disconnect processing, this is processing which
reconnects tot he initiator at the point when operations on the SCSI bus again
become necessary.
Glossary
C141-E039-01EN
GL - 1
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