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Chapter 7 SCSI Interface
Chapter
7
SCSI Interface
7.1. Logical Characteristics
7.1.1. Arbitration
The autoloader does not support Disconnect-Reconnect mode page 02h.
7.1.2. Selection Response Time
The autoloader responds to a selection within 200 µs.
Note
This specification does not apply after reset or after turning on the autoloader.
7.1.3. RESELECTION Time-out Procedure (Non-Queued)
The autoloader RESELECTION time-out procedure is performed as follows.
To retry after reselection times out, the autoloader uses the following
ARBITRATION to acquire the bus and perform the reselection. At this point,
to prevent other devices from carrying out a time-out/retry, the autoloader
inserts a delay of at least 200 µs to each retry by other devices. During this delay
the autoloader responds to a selection from the initiator.
If the specified number of retries still fails, the autoloader deems reselection
necessary, aborts the I/O process, and generates a CHECK CONDITION/Select
or reselect failure. However, to report this sense data, the following SCSI
command is not forcibly terminated with a CHECK CONDITION.
7.1.4. ATTENTION Condition
As long as the initiator asserts the ATN signal before releasing the ACK signal
for the last byte of the previous phase, the autoloader responds to an
ATTENTION condition before moving to the next phase or during that phase.
At this point, the autoloader does not respond to the ATN on the basis of
whether the ATN signal is asserted or not, but responds to the ATN signal when
the ACK is released.
