4-54
Upon receiving the MESSAGE REJECT message, this scanner takes action as shown in the following table
Table 4-26
Message rejected
Action
COMMAND COMPLETE
Moves to the BUS
FREE
phase. (It is not
assumed as an error.)
MESSAGE REJECT
Responds the CHECK CONDITION status
No message issued
Moves to the BUS FREE phase
4.6.2.5
NO OPERATION (X'08'): MESSAGE OUT phase (initiator
→
target)
This message is issued in response to a message request from the target and indicates that the initiator does have a valid
message.
The initiator does not intend to issue another message by activating ATN before it deactivates the ACK of the
OPERATION message.
4.6.2.6
MESSAGE PARITY ERROR (X'09'): MESSAGE OUT phase (initiator
→
target)
This message indicates that the initiator detected a parity error in the message received. The target resends that message.
The initiator does not intend to issue another message by activating ATN before it deactivates the ACK of the MESSAGE
PARITY ERROR message.
Upon receiving the MESSAGE PARITY ERROR message, this scanner takes action as shown in the following table.
Table 4-27
Phase when ATN is detected
Action
MESSAGE IN
Moves to the MESSAGE IN phase and
resends the message (*1)
Other
Moves to the BUS FREE phase
* 1
This scanner retries three times with the message in the MESSAGE IN phase. If the third retry
fails, the scanner immediately moves to the BUS FREE phase.
4.6.2.7
BUS DEVICE RESET (X'0C'): MESSAGE OUT phase (initiator
→
target)
This message addresses any initiators that are operating, or waiting for operation, on the target. The message initializes
those initiators by resetting their input/output operations.
The BUS DEVICE RESET message is transferred in the asynchronous mode.
