Seagate Ultra 160 ユーザーズマニュアル
Parallel SCSI Interface Product Manual, Rev. A
91
Table 32:
MODIFY BIDIRECTIONAL DATA POINTER message format
4.3.11
NO OPERATION
The NO OPERATION message is sent from an initiator in response to a target’s request for a message when
the initiator does not currently have any other valid message to send.
the initiator does not currently have any other valid message to send.
For example, if the target does not respond to the attention condition until a later phase and at that time the
original message is no longer valid the initiator may send the NO OPERATION message when the target
switches to a MESSAGE OUT phase.
original message is no longer valid the initiator may send the NO OPERATION message when the target
switches to a MESSAGE OUT phase.
Bit
Byte
7
6
5
4
3
2
1
0
0
EXTENDED MESSAGE (01H)
1
EXTENDED MESSAGE LENGTH (09H)
2
MODIFY BIDIRECTIONAL DATA POINTER (05H)
3
(MSB)
DATA--OUT ARGUMENT
4
5
5
6
(LSB)
7
(MSB)
DATA--IN ARGUMENT
8
9
9
10
(LSB)