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Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2),Rev. E
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Table 3.5.2-1. Message codes
Negate Atn Before
Code
Message Name
Direction
Last Ack
01h***
EXTENDED MESSAGES
In
Out
Yes
06h
ABORT
Out
Yes
0Dh
ABORT TAG
Out
Yes
0Ch
BUS DEVICE RESET
Out
Yes
0Eh
CLEAR QUEUE
Out
Yes
00h
COMMAND COMPLETE
In
—-
04h
DISCONNECT
In
-—
80h+
IDENTIFY
In
—-
80h+
IDENTIFY
Out
No
23h
IGNORE WIDE RESIDUE (Two Bytes)
In
—-
0Fh
INITIATE RECOVERY
In
Out
Yes
05h
INITIATOR DETECTED ERROR
Out
Yes
0Ah
LINKED COMMAND COMPLETE
In
—-
0Bh
LINKED COMMAND COMPLETE
(With Flag)
In
—-
09h
MESSAGE PARITY ERROR
Out
Yes
07h
MESSAGE REJECT [1]
In
Out
Yes
***
MODIFY DATA POINTER
In
—-
08h
NO OPERATION
Out
Yes
Queue Tag Messages (Two Bytes)
21h
HEAD OF QUEUE TAG
Out
No
22h
ORDERED QUEUE TAG
Out
No
20h
SIMPLE QUEUE TAG
In
Out
No
10h
RELEASE RECOVERY
Out
Yes
03h
RESTORE POINTERS
In
—-
02h
SAVE DATA POINTER
In
—-
***
SYNCHRONOUS DATA TRANSFER REQUEST
In
Out
Yes
***
WIDE DATA TRANSFER REQUEST
In
Out
Yes
11h
TERMINATE I/O PROCESS
Out
Yes
12h
CONTINUE I/O PROCESS
Out
Yes
13h
TARGET TRANSFER DISABLE
Out
Yes
14h - 1Fh
RESERVED
24h - 2Fh
RESERVED for two-byte messages
30h - 7Fh
RESERVED
KEY: In
= Target to initiator.
Out = Initiator to target
Yes
= Initiator shall negate ATN before last ACK of message
No
= Initiator may or may not negate ACK before last ACK of message. (see attention condition)
—
= Not Applicable
***
= Extended message (see Tables 3.5.3-3 through 3.5.3-5)
80h+ = Codes 80h through FFh are used for IDENTIFY messages
[1]
= The drive does not resend (RETRY) the original message.
