User's Manual

DLT2000 SCSI Interface
8-8 DLT2000/DLT2700 Cartridge Tape Subsystem
8.3 SCSI Message System
The message system allows communication between an initiator and a target for the
purpose of physical path management.
To support certain SCSI-1 initiators, an Identify message is not required by the
DLT2000. If a message is sent by the initiator after the SELECTION phase, it should
be an IDENTIFY, ABORT, or BUS DEVICE RESET message. If the DLT2000
receives any other message in this case, it will go directly to BUS FREE phase.
The following messages are supported:
Table 8-1 Supported SCSI Messages
Code In/Out Description Section
06 Out ABORT ABORT (06h)
0D Out ABORT TAG ABORT TAG (0Dh)
0C Out BUS DEVICE RESET BUS DEVICE RESET (0Ch)
0E Out CLEAR QUEUE CLEAR QUEUE (0Eh)
00 In COMMAND COMPLETE COMMAND COMPLETE (00h)
04 In DISCONNECT DISCONNECT (04h)
01 Both EXTENDED MESSAGE (SDTR
only and wide Data Transfer
Request-See note)
ExtENDED MESSAGE (01h)
08-FF Both IDENTIFY IDENTIFY (80h-FFh)
05 Out INITIATOR DETECTED
ERROR
INITIATOR DETECTED ERROR
(05h)
0A In LINKED COMMAND
COMPLETE
LINKED COMMAND COMPLETE
(0Ah)
0B In LINKED COMMAND
COMPLETE w/flag
LINKED COMMAND COMPLETE,
with flag (0Bh)
09 Out MESSAGE PARITY ERROR MESSAGE PARITY ERROR (09h)
07 Both MESSAGE REJECT MESSAGE REJECT (07h)
08 Out NO-OP NO-OP ( NO OPERATION)(08h)
03 In RESTORE POINTERS RESTORE POINTERS (03h)
02 In SAVE DATA POINTER SAVE DATA POINTER (02h)