Hitachi DK32EJ - Ultrastar Series 36.9 GB Hard Drive Reference Manual page 91

Logical Unit Number
Zero is the only valid LUN for this controller.
If LUN dose not set zero,this controller will return Check condition status.
Task Attribute
000:SIMPLE_QUEUE
The SIMPLE_QUEUE attribute is specified when the task can be executed with the
That this controller determines.
001:HEAD_OF_QUEUE
The HEAD_OF_QUEUE attribute is specified when the task should be executed with the
highest priority.
010:ORDERED_QUEUE
The HEAD_OF_QUEUE attribute is specified when the task should be executed with the
order of the task is issued.
100: ACA_QUEUE (Plan to support)
Only FCP_CMND (which received from same Host that caused the ACA condition) with the
ACA_QUEUE attribute will be executed, when an ACA condition is active.
101: UNTAGGED
Only one FCP_CMND with the UNTAGGED attribute from each host will be executed.
If another FCP_CMND with the UNTAGGED attribute is received from the host, this
controller terminates the command with a CHECK CONDITION status.
TERMINATE TASK
This Task Management Flag is not supported by this controller.
CLEAR ACA (Plan to support)
The CLEAR ACA is used to clear the ACA condition.
TARGET RESET
The TARGET RESET is used to clear all tasks in this controller.
(Same as the SCSI-2 Bus Device Reset message)
CLEAR TASK SET
The CLEAR TASK SET is used to clear all tasks in the specified Logical Unit.
(Same as the SCSI-2 Clear Queue message)
ABORT TASK SET
The ABORT TASK SET is used to clear all tasks in the specified Logical Unit for the
Initiator.
(Same as the SCSI-2 Abort message)
(Note) The ABORT TASK (Same as the SCSI-2 Abort Tag message) is executed by the ABTS
Link Service.
Read Data
Set One when the command specified by the CDB field will result in a data transfer to the
initiator.
Write Data
Set One when the command specified by the CDB field will result in a data transfer from the
initiator.
CDB(Command Descriptor Block)
Always 16 bytes long.The actual contents depends on the command type.Unused bytes are
Not checked by this controller.If any of the Task Management flags are set in byte 10,the
CDB field is ignored.
4 SCSI BUS
OEM MANUAL:K6602771
Revision: 2 / Date: 2002.12.19
Page: 91 / 313