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3-106 M3099GX/GH OEM Manual
MESSAGE REJECT (Init ↔ Targ)
The MESSAGE REJECT message is sent from either the initiator or
target to indicate that the last message or message byte it received was
inappropriate or has not been implemented.
In order to indicate its intentions of sending this message, the
initiator shall assert the ATN signal prior to its release of the ACK
signal for the REQ/ACK signal for the REQ/ACK handshake of the
message byte that is to be rejected. If the target receives this message
under any other circumstance, it shall reject this message.
When a target sends this message, it shall change to MESSAGE IN
phase and send this message prior to requesting additional message
bytes from the initiator. This provides and interlock so that the
initiator can determine which message byte is rejected.
After a target sends a MESSAGE REJECT message and if the ATN
signal is still asserted, then it shall return to the MESSAGE OUT
phase. The subsequent MESSAGE OUT phase shall begin with the
first byte of a message.
NO OPERATION (Init → Targ)
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no longer valid the initiator may send the NO OPERATION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 enters the MESSAGE OUT phase.
#03.pm5 98.2.22, 1:34 PM106