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Page 14
Message exception handling
Phase During Which ATN is Raised
Message
Abort (06h)
BDR (0Ch)
Identify
(80h/C0h)
IDE (05h)
Reject (07h)
Parity (09h)
NOP (08h)
SDTR
WDTR
Unrecognized
or illegal
Message-In Byte During Which ATN is Raised
Message
Abort (06h)
BDR (0Ch)
Identify
(80h/C0h)
IDE (05h)
Reject (07h)
Parity (09h)
NOP (08h)
SDTR
WDTR
Unrecognized
or illegal
Retry
Retry has not been exhausted
EOM
End of the message
Message exceptions are handled as described in the following tables. The numbers
in the tables identify the actions that the drive takes when an exception under the
identified conditions occurs. The actions are listed following the tables.
Selection
Ident.
2
2
2
2
12
7, 11
5
2
5
2
5
2
5
9
5
10
5
10
5
6
Restore
SDP
Pointers
(02h)
(03h)
2
2
2
2
7, 11
7, 11
If Retry, 4
If Status, 2,
else 5
if No Status,
5
2
If Status, 2,
if No Status,
5
If Retry, 4
If Status, 2,
else 5
if No Status,
5
9
9
7, 11
7, 11
7, 11
7, 11
6
6
Cmd
Data in
2
2
2
2
7, 11
7, 11
If Retry, 8,
If Retry, 8,
else 5
else 5
2
2
11
11
9
9
7, 11
7, 11
7, 11
7, 11
6
6
Disconnect
Reject
(04h)
(07h)
2
2
2
2
7, 11
7, 11
If Retry, 4,
If Retry, 4,
else 5
else 13
1
2
If Retry, 4,
If Retry, 4,
else 5
else 13
9
9
7, 11
7,11
7, 11
7,11
6
6
Status
Status has been reported
No Status Status has not been reported
LTO SCSI Interface Manual
Data out
Status
2
2
2
2
7, 11
7, 11
If Retry, 8,
If Retry, 8, if
else 5
Status, 2, if
No Status,
5
2
2
11
11
9
9
7, 11
7, 11
7, 11
7, 11
6
6
Identify
CC
(80h)
(00h)
2
2
2
2
7, 11
2
If retry, 4,
2
else 5
2
2
If Retry, 4,
2
else 5
9
2
7, 11
2
7, 11
2
6
2
sdtr/wdtr
2
2
7, 11
If Retry, 4,
else 5
1
If Retry, 4,
else 5
If EOM, 9,
else 4
10
10
If EOM, 6,
else 4
Ignore
Wide Resi-
due
(23h)
2
2
7, 11
If retry, 4,
else 5
2
If Retry, 4,
else 5
If EOM, 9,
else 4
7, 11
7, 11
If EOM, 6,
else 4
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