Glossary - Fujitsu MAN3184 SERIES Specifications

Bus condition: Asynchronous operation condition used for status transition of SCSI bus. There are two
types of bus conditions: ATTENTION and RESET conditions.
Bus phase: The name of SCSI bus state.
ARBITRATION, SELECTION, RESELECTION or INFORMATION TRANSFER phase.
The INFORMATION TRANSFER phase is divided into subphases such as DATA IN,
DATA OUT, COMMAND, STATUS, MESSAGE IN, and MESSAGE OUT.
Initiator (INIT):
An SCSI device which has started up an I/O operation on the SCSI bus. The device is
referred to as INIT in this manual.
CCS: The standard SCSI logical specifications developed by the ANSI working committee. The
CCS defines the functions required for direct access devices (such as disk drive).
CDB: A group of data which describes the I/O operation commands. The CDB is sent from the
initiator to the target.
Command: An I/O operation command to the target unit (or TARG). It is referred to as the CDB.
Disconnect: Operation performed by the target to free itself from the SCSI bus and the initiator
temporarily when SCSI bus operation becomes unnecessary during command processing.
Initiator: SCSI device that has initiated an input/output operation on the SCSI device. This can be
abbreviated as INIT.
Logical unit: Simple unit of equipment that can be directed to perform one I/O operation on the SCSI bus.
LUN: Logical unit number used to identify a logical unit.
LUT: A logically assigned unit which can perform I/O operations on the SCSI bus.
Message: Information that controls a series of bus phases and I/O sequence between the initiator and
the target on the SCSI bus.
Reconnect: Operation performed by the target to reconnect itself with the initiator when operation on the
SCSI bus becomes necessary after disconnection.
SCSI: The standard I/O interface developed by the ANSI (X3.131-1986).
SCSI ID: A physical device address which identifies an SCSI device on the SCSI bus. Each SCSI
device must have a unique ID. The SCSI IDs can be 0 to 7, which corresponds to one bit of
the data bus.
SCSI unit: Generic name of a unit (input/output unit, I/O controller, or host adapter) connected to the
SCSI bus.
Sense code: One-byte of code attached to sense data identify the type of the detected error.
Sense data: Detailed information created by the target when any error is involved in the command
termination status. This information is transferred to report the error.

Glossary

The SCSI bus can be either in the BUS FREE,
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