Information Transfer Phases - Tandberg Data SLR7-140 PROGRAMMER Manual

Tandberg Data
3.1.1.3. Selection Phase
The Selection phase allows the Initiator to select the
drive for the purpose of having the Drive execute a
command or physical path management function.
3.1.1.4. Reselection Phase
The Reselection phase allows the Drive to reconnect to
an initiator for
operation that was previously started by that initiator,
but was suspended by the Drive (e.g. it disconnected).
When attempting to reselect its Initiator, the Drive
implements the recommended Reselection Time-out Delay
according to ANSI [2] and [6].
If Reselection does not succeed, the Drive considers the
current command for terminated (as if an ABORT message
had been received). Buffered data will continue to be
written to the tape if the time-out occurs during a
write operation. Immediate commands will continue their
execution. No sense
generated. A new command from the same or any other
Initiator will execute normally (as if no time-out had
occurred).
3.1.2.

Information Transfer Phases

3.1.2.1. Command Phase
The COMMAND phase is used by the Drive to request com-
mand information from the Initiator.
The Drive transfers either six (Group 0 commands) or ten
(Group 1 commands) command bytes in one single Command
Phase.
3.1.2.2. Data In/Out Phases
The DATA-IN phase is used by the Drive to request that
data is sent from the Drive to the Initiator.
The DATA-OUT phase is used by the Drive to request that
data is sent from the Initiator to the Drive.
Synchronous and
supported. 8 bit
supported.
3.1.2.3. Status Phase
The STATUS phase is used by the Drive to request that
status information
Initiator.
3-2 Tandberg SLR Product Line SCSI Functional Specifications
the purpose of
data error information
asynchronous Data
and 16 bit wide
is sent from
Logical Characteristics
continuing some
will
Transfer are
SCSI-busses are
the Drive to the
be