Messages-General - Seagate SCSI Interface Product Manual

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3.5.2 Messages—General
The messages supported by the various drives are listed in a table in the individual drive's Product Manual,
Volume 1. Table 3 lists Messages that are defined by the SCSI protocol. The message code values are given a
direction specification (In-Out). Detailed descriptions follow the table. Messages other than those supported by
a drive are answered by the drive with a Message Reject message.
Table 3: Message codes
Code Message name
01h*** Extended Message
06h Abort Task Set
0Dh Abort Task
0Ch Bus Device Reset
0Eh Clear Task Set
00h Task Complete
04h Disconnect
80h–FFh [2] Identify
80h–FFh [2] Identify
23h Ignore Wide Residue (Two Bytes)
0Fh Initiate Recovery
05h Initiator Detected Error
0Ah Linked Command Complete
0Bh Linked Command Complete (With Flag)
09h Message Parity Error
07h Message Reject [1]
*** Modify Data Pointer
08h No Operations
Queue Tag Messages (Two Bytes)
21h Head of Queue Tag
22h Ordered Queue Tag
20h Simple Queue Tag
10h Release Recovery
03h Restore Pointers
02h Save Data Pointer
*** Synchronous Data Transfer Request
*** Wide Data Transfer Request
12h Continue Task
13h Target Transfer Disable
14h–1Fh Reserved
24h–2Fh Reserved for two-byte messages
30h–7Fh Reserved
KEY: In = Target to initiator
Yes = Initiator shall negate ATN before last ACK of message
No = Initiator may or may not negate ACK before last ACK of message (see Section 3.2.1, Attention Condition)
— = Not applicable
*** = Extended message (see Tables 6 through 9)
80h+ = Codes 80h through FFh are used for Identify messages
[1] = The drive does not resend (Retry) the original message
[2] = See Table 4.
Direction
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
Out = Initiator to target
SCSI Interface Product Manual, Rev. J
Negate ATN
before last ACK
Out Yes
Out Yes
Out Yes
Out Yes
Out Yes
—
—
—
Out No
—
Out Yes
Out Yes
—
—
Out Yes
Out Yes
—
Out Yes
Out No
Out No
Out No
Out Yes
—
—
Out Yes
Out Yes
Out Yes
Out Yes