Phase Sequencing - Tandberg Data SLR7-140 PROGRAMMER Manual

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Tandberg Data

31.11. 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 the specified transfer
length in the WRITE BUFFER command is zero.
:= <initiator-part> <message-out> <command> <disconnect>
{<reconnect> <data-out> <disconnect>} <reconnect> <completed>
This sequence will be used when the transfer length is
greater than zero in the WRITE BUFFER command.
The Drive will disconnect when the number of data bytes
just transferred equals the number of bytes specified by
the Maximum Burst Size field in MODE SELECT command. The
Drive will then
another burst with a maximum size again controlled by
the Maximum Burst Size.
:= <initiator-part> <message-out> command> <completed>
This sequence will be used when the specified transfer
length in the
disconnection is not allowed.
:= <initiator-part> <message-out> <command> <data-out> <completed>
This sequence will be used when the transfer length is
greater than zero and disconnection is not allowed.
31-7 Tandberg SLR Product Line SCSI Functional Specifications
reconnect immediately
WRITE BUFFER command
Write Buffer
to transfer
is zero and