11 no operation – Seagate Ultra 320 User Manual
Page 105
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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.
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original message is no longer valid the initiator may send the NO OPERATION message when the target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.
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
6
(LSB)
7
(MSB)
DATA--IN ARGUMENT
8
9
10
(LSB)
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