Phase Sequencing - Tandberg Data SLR7-140 PROGRAMMER Manual

<sequence 1>
<sequence 2>
<sequence 3>
<sequence 4>
Tandberg Data

17.4. Phase Sequencing

In this section the possible SCSI-bus phase sequences
during execution of the command are described. Section
3.2.1 has more details about the generic phases in the
brackets.
:= <initiator-part> <message-out> <command> <disconnect> <reconnect>
<completed>
This sequence will be used when an error is detected
during the initial part of the READ command or when the
Transfer Length is zero.
:= <initiator-part> <message-out> <command> {<disconnect>
<reconnect> <data-in>} <completed>
This sequence will
terminates with GOOD STATUS.
The Drive will first disconnect when the CDB has been
transferred. The Drive will reconnect when the number of
bytes ready for transfer is equal or larger than the
Read Buffer Full Ratio. The Drive will disconnect to
make sure that the burst size never exceeds the number
of bytes specified by the Maximum Burst Size. The Drive
will not disconnect after the last data burst.
:= <initiator-part> <message-out> <command>{<disconnect> <reconnect>
<data-in>}<disconnect> <reconnect> <completed>
This sequence will be used when an error is encountered
during the READ operation.
The sequence is equal to <sequence 2> except that the
Drive will disconnect before sending status.
:= <initiator-part> <message-out> <command> {<data-in>} <completed>
This sequence will be used when the READ command is
executed and the Initiator does not allow disconnection.
17-9 Tandberg SLR Product Line SCSI Functional Specifications
be used when the
Read
READ command