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40
3.6
Message exception conditions handling
Table 12 attempts to clarify how to handle message exception conditions. The numbers in the grid spaces of
Table 12 are response code numbers that are decoded and explained in note [4].
Table 12:
SCSI message handling
Message
Abort (06)
Abort Tag (0D)
Bus Device Reset (0C)
Bus Device Reset—Other Ports (14) [2]
Clear Task Set (0E)
Continue Task (12)
Initiator Detected Error (05)
Identify (Invalid - changed the value
of LUNTRN.)
Identify (Invalid - LUNTAR bit or a
reserved bit is set)
Identify (Valid) [3]
Message Parity Error (09)
Message Reject (07)
No Op (08)
Task Set—Simple (20)
Task Set—Ordered (22)
Task Set—Head (21)
Synchronous Transfer Request
Target Transfer Disable (13)
Wide Transfer Request
Invalid, unimplemented, illegal messages
Parity error detected by target
[1]
Phase abbreviations are as follows:
Abbreviation
Phase/message
Sel
Selection
ID
Identify (after Selection)
Mout
Message Out
Cmd
Command
M-in
Message In (not Cplt or Disc)
Resel
Reselect (after Identify)
Disc
Message In (Disconnect)
Data
Data In/Out
Stat
Status
Cplt
Message In (Task Complete)
[2]
The responses for the Bus Device Reset Other Ports message assume that the drive will implement this
message. When the message isn't implemented (i.e., on drives which do not support dual-port SCSI), the
responses will be as stated in the "Invalid, unimplemented, illegal msgs" row.
Phase [1] Sel
ID
Mout
2
2
2
4
2
2
2
2
2
4
1
1
4
2
2
4
1
1
4
5
7
N/A
C
C
3,4
3,1
3,1
1
1
1
4
4
C
4
3,1
3,1
4
1
1
4
1
3,1
4
1
3,1
1,4
1
3,1
4
1
1
4
1
1
4
1
1
4
3,1
3,1
B
5
5
SCSI Interface Product Manual, Rev. J
Cmd
M-in
Resel
Disc
Response Code [4]
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
9,1
2
2
2
2
3,1
3,1
3,1
3,9,1
6
5
5
5
C
C
C
C
3,1
3,1
3,1
3,9,1
1
1
1
9,1
C
5
5
5
3,1
A
C
8
1
1
1
9,1
3,1
3,1
3,1
3,9,1
3,1
3,1
3,1
3,9,1
3,1
3,1
3,1
3,9,1
1
1
1
9,1
3,1
3,1
3,1
3,9,1
1
1
1
9,1
3,1
3,1
3,1
3,9,1
6
N/A
N/A
N/A
Data
Stat
Cplt
2
2
2
2
2
2
2
2
2
1
1
9,1
2
2
2
3,1
3,1
3,9,1
7
6
5
C
C
C
3,1
3,1
3,9,1
1
1
9,1
C
C
5
3,1
3,1
9,1
1
1
9,1
3,1
3,1
3,9,1
3,1
3,1
3,9,1
3,1
3,1
3,9,1
1
1
9,1
3,1
3,1
3,9,1
1
1
9,1
3,1
3,1
3,9,1
7
N/A
N/A
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