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SCSI Interface Product Manual, Rev. B
by the particular drive. In the tables, the message code values are given a direction specification (In-Out).
Detailed descriptions follow the tables. Messages other than those supported by a drive are answered by the
drive with a MESSAGE REJECT message.
4.3.1
LINK CONTROL MESSAGES
Table 26:
Link Control message codes
Support
IU transfers
disabled
Code
Init
Targ
04h
O
O
80h+
M
O
80h+
M
M
23h
O
O
05h
M
M
0Ah
O
O
09h
M
M
07h
M
M
01h,05h,00h
O
O
01h,09h,05h
O
O
08h
M
M
01h,06h,04h
M
M
55h
NS
O
03h
O
O
02h
O
O
01h,03h,01h
O
O
00h
M
M
01h,02h,03h
O
O
Key:
M = Mandatory support O = Optional support
IN = SCSI target port to SCSI initiator port
Yes = SCSI Initiator port shall clear the attention condition before last ACK of the Message Out phase.
Not required = SCSI Initiator port may or may not clear the attention condition before last ACK of the MES-
SAGE OUT phase (see Section 5.1)
N/A = Not applicable
Init = SCSI initiator port Targ = SCSI target port
80h+ = Codes 80h through FFh are used for IDENTIFY messages
Note.
The clear attention condition only applies during MESSAGE OUT phase.
IU transfers
enabled
Init
Targ
Message name
O
O
DISCONNECT
NS
NS
IDENTIFY
NS
NS
IDENTIFY
NS
NS
IGNORE WIDE RESIDUE
M
M
INITIATOR DETECTED
ERROR
NS
NS
LINKED COMMAND
COMPLETE
M
M
MESSAGE PARITY
ERROR
M
M
MESSAGE REJECT
O
O
MODIFY DATA POINTER
O
O
MODIFY BIDIRECTIONAL
DATA POINTER
M
M
NO OPERATION
M
M
PARALLEL PROTOCOL
REQUEST
O
O
QAS REQUEST
O
O
RESTORE POINTERS
NS
NS
SAVE DATA POINTER
M
M
SYNCHRONOUS DATA
TRANSFER REQUEST
NS
NS
TASK COMPLETE
M
M
WIDE DATA TRANSFER
REQUEST
NS = Not supported
OUT = SCSI Initiator port to SCSI target port
Direction
Reference
section
In
Out
4.3.2
In
Out
4.3.3
In
4.3.3
Out
4.3.4
In
4.3.5
Out
In
4.3.7
Out
4.3.8
In
Out
4.3.9
In
4.3.9
In
4.3.11
Out
4.3.12
In
Out
4.3.13
In
4.3.14
In
4.3.15
In
4.3.16
In
Out
4.3.17
In
4.3.18
In
Out
77
Clear
attention
condition
Yes
N/A
Not required
N/A
Yes
N/A
Yes
Yes
N/A
N/A
Yes
Yes
N/A
N/A
N/A
Yes
N/A
Yes
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