Tandberg Data SLR7-140 PROGRAMMER Manual page 63

<disconnect>
<reconnect>
Tandberg Data
::= < message-in> BUS-FREE |
<message-in> < message-in> BUS-FREE
When the Drive
message in bytes before going to the BUS FREE phase.
When transferring
DISCONNECT message. When transferring two messages, the
first message will be a SAVE DATA POINTER message. The
second message will be a DISCONNECT message. The Drive
sends a single message when it disconnects after having
transferred a CDB. It sends two messages in all other
cases.
::= BUS-FREE ARBITRATION RESELECTION <message-in>
The Drive reconnects to the Initiator by waiting for BUS
FREE, arbitrating for the bus and then by performing the
reselection. A single message in byte follows. This will
be an IDENTIFY message with the Disconnect Privilege bit
set to zero and with a zero LUN field.
3.2.1.3. Disconnects/Reconnects
Disconnection is the process of going through one or two
MESSAGE-OUT phases and then to the BUS FREE phase in the
middle of a command
disconnected, it will always try to reconnect at a later
time. Reconnection is the process of going from the BUS
FREE phase to the ARBITRATION phase, RESELECTION and
MESSAGE-IN phase.
When disconnecting, the first of possibly two messages
transferred will be a SAVE DATA POINTER message. The
second or only message will be a DISCONNECT message. The
Drive will then enter the BUS FREE phase.
When reconnecting, the message transferred will be an
IDENTIFY message with the Disconnect Granted bit (Bit 6)
set to zero. The six LUN bits will also be set to zero.
All commands except INQUIRY, REQUEST SENSE and TEST UNIT
READY will disconnect
disconnection. The first disconnect will always occur
immediately after the CDB transfer.
Please refer to the section for each command to see if
and when during
disconnects/reconnects.
3-7 Tandberg SLR Product Line SCSI Functional Specifications
disconnects it
a single message,
execution.
if the
the execution
Logical Characteristics
may send one or
this will
When the Drive
Initiator grants
the command
two
be a
has