Tandberg Data
Message System
6-10
Tandberg SLR Product Line SCSI Functional Specifications
Following Drive response (1) above, the implied
agreement for synchronous operation is considered to be
negated if the initiator asserts the ATN signal and the
first message out is either MESSAGE PARITY ERROR or
MESSAGE REJECT. In this case, both devices shall go to
asynchronous data transfer mode for data transfers
between the two devices. For the MESSAGE PARITY ERROR
case, the implied agreement shall be reinstated if a re-
transmittal of the second of the pair of messages is
successfully accomplished. After a specific number of
retry attempts, if the Drive receives a MESSAGE PARITY
ERROR message, it will terminate the retry activity, and
both devices shall go to asynchronous data transfer mode
for data transfers between the two devices. The number
of retry attempts is specified in the Bus Parity Error
Retries field in the Miscellaneous Page of the Mode
Select command. Please refer to section 14.3.9 for
further details.
The implied synchronous agreement shall remain in effect
until a TARGET RESET message is received, until a hard
reset condition occurs, or until the Initiator elects to
modify the agreement.
