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0
1
Simple Queue Tag (20
This message specifies that the I/O process will be placed in the logical unit's
command queue. The order of execution is defined by the controller.
Head Of Queue Tag (21
unit's command queue. An I/O process already being executed by the controller
will not be preempted. A subsequent I/O process received with this message will
order.
Ordered Queue Tag (22
This message specifies that the I/O process will be placed in the logical unit's
the logical unit received prior to this I/O process will be executed before this I/O
process is executed. All queued I/O processes received after this I/O process will
Head Of Queue Tag message.
Ignore Wide Residue (23
Byte
0
1
This message is sent from the controller to the host computer(initiator) to
indicate that the number of valid bytes sent during the last REQ/ACK
message will be sent immediately following the DATA IN phase and prior to any
other message. The ignore field is defined as follows.
SCSI BUS
Description
Queue Tag (00 - FF
)
H
)
H
)
H
)
H
Message Code (23 )
00
01
02
03
04 -FF
H
, 21 or 22
H
H
H
, 02 , 03
H
H
Ignore field of 16-bits transfer
Reserved
DB (15-8)
Reserved
Reserved
OEM MANUAL:K6602924
1 / Date: 200 .03 06
Page:
/ 273
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