Scanner Interface

Upon receiving the MESSAGE REJECT message, this scanner takes action as shown in the following table.

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

 

 

DISCONNECT

The command execution is continued with

 

connecting the SCSI bus (without disconnecting).

 

 

SAVE DATA POINTER

The command execution is continued with

 

connecting the SCSI bus (without disconnecting).

 

 

IDENTIFY

When this message is issued for reconnection, the

 

command is terminated with an error. In this case,

 

the reconnection for the command is not performed

 

 

RESTORE POINTERS

The error recover is interrupted and the CHECK

 

CONDITION status is responded.

 

 

SYNCHRONOUS DATA

The command execution is continued in

TRANSFER REQUEST

Asynchronous transfer mode.

 

 

No message issued

Moves to the BUS FREE phase

 

 

(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 not have a valid message.

The initiator does not intend to issue another message by activating ATN before it deactivates the ACK of the NO OPERATION message.

(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 only 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.

Phase when ATN is

Action

detected

 

 

 

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, this scanner immediately moves to the BUS FREE phase.

Appendix A-110