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Table 26:
Extended Message Codes
Code
Extended message
00h
MODIFY DATA POINTERS
01h
SYNCHRONOUS DATA TRANSFER REQUEST
02h
Reserved
03h
WIDE DATA TRANSFER REQUEST
04h
PARALLEL PROTOCOL REQUEST
05h
MODIFY BIDIRECTIONAL DATA POINTER
06h - FFh
Reserved
1. The EXTENDED MESSAGE ARGUMENTS are specified within the Extended Message Descriptions
in Paragraphs referenced in Table 27.
4.3
Message categories
The messages supported by the various drives are divided up into categories and listed in tables in the follow-
ing subsections. The individual drive's Product Manual. Table 27 lists messages that are supported by the par-
ticular 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 27:
Link Control message codes
Support
IU transfers
disabled
Code
Init
Targ
04h
O
80h+
M
80h+
M
23h
O
05h
M
0Ah
O
09h
M
07h
M
01h,05h,00h
O
01h,09h,05h
O
08h
M
01h,06h,04h
M
Parallel SCSI Interface Product Manual, Rev. A
IU transfers
enabled
Init
Targ
Message name
O
O
O
DISCONNECT
O
NS
NS
IDENTIFY
IDENTIFY
M
NS
NS
O
NS
NS
IGNORE WIDE RESIDUE
INITIATOR DETECTED
M
M
M
ERROR
LINKED COMMAND
O
NS
NS
COMPLETE
MESSAGE PARITY
M
M
M
ERROR
M
M
M
MESSAGE REJECT
O
O
O
MODIFY DATA POINTER
MODIFY BIDIREC-
O
O
O
TIONAL DATA POINTER
M
M
M
NO OPERATION
PARALLEL PROTOCOL
M
M
M
REQUEST
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
Clear
attention
condition
Yes
N/A
Not
required
N/A
Yes
N/A
Yes
Yes
N/A
N/A
Yes
Yes
85
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