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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.