Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB Product Manual page 347

Appendix B. SCSI Bus Signal Timing
Message
ABORT TASK
ABORT TASK SET
CLEAR TASK SET
CONTINUE TASK
DISCONNECT
IDENTIFY
IGNORE WIDE RESIDUE
INITIATE RECOVERY
INITIATOR DETECTED ERROR
LINKED COMMAND COMPLETE
LINKED COMMAND COMPLETE (with flag)
MESSAGE PARITY ERROR
MESSAGE REJECT
NO OPERATION
Queue Tag Messages (two bytes)
HEAD OF QUEUE TAG
ORDERED QUEUE TAG
SIMPLE 2 (SIMPLE QUEUE TAG)
RELEASE RECOVERY
SAVE DATA POINTER
SYNCHRONOUS DATA TRANSFER
REQUEST 4
TARGET RESET
TARGET TRANSFER DISABLE
TASK COMPLETE
WIDE DATA TRANSFER REQUEST
PARALLEL PROTOCOL REQUEST
Notes: 1
2
3
4
Two-byte messages consist of two consecutive bytes. The value of the first byte, as
defined in Table B-10, determines which message is to be transmitted. The second
byte is a parameter byte that is used as defined in the message description.
A value of 01h in the first byte indicates the beginning of a multiple-byte extended
message. The extended message format is shown in Figure B-1 and the data fields
are described in Table B-12.
B–26 Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
Table B–11 Supported SCSI Messages
2 (ABORT TAG)
2 (ABORT)
2 (CLEAR QUEUE)
2 (CONTINUE I/O PROCESS)
3
3
2 (BUS DEVICE RESET)
2 (COMMAND COMPLETE)
2
4
In = target to initiator; Out = initiator to target (drive).
SCSI-3 terminology (SCSI-2 term in parentheses).
Multibyte message.
Extended messages (see Figure B-1).
Message Code
0Dh
06h
0Eh
12h
04h
80h – FFh
23h
0Fh
05h
0Ah
0Bh
09h
07h
08h
21h
22h
20h
10h
02h
01h
0Ch
13h
00h
03h
04h
Direction 1
Out
Out
Out
Out
In Out
In Out
In
In
Out
In
In
Out
In Out
Out
Out
Out
In Out
Out
In
In Out
Out
Out
In
In Out
In Out