List of SCSI message codes
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This is a list of SCSI message codes.
A SCSI message code is a computer term which defines how SCSI devices send interface management information. The message code comprises one or more bytes.
List of message formats
[edit]The first byte of the message determines the format:
Value | Message format |
---|---|
00h | One-byte message (COMMAND COMPLETE) |
01h | Extended messages |
02h-1Fh | One-byte messages |
20h-2Fh | Two-byte messages |
30h-7Fh | Reserved |
80h-FFh | One-byte message (IDENTIFY) |
List of message codes
[edit]Value | Message name | Format |
---|---|---|
00h | COMMAND COMPLETE | |
01h | EXTENDED MESSAGE | 01nnyy... - nn is the length, yy is the extended message code |
02h | SAVE DATA POINTER | |
03h | RESTORE POINTERS | |
04h | DISCONNECT | |
05h | INITIATOR DETECTED ERROR | |
06h | ABORT | |
07h | MESSAGE REJECT | |
08h | NO OPERATION | |
09h | MESSAGE PARITY ERROR | |
0Ah | LINKED COMMAND COMPLETE | |
0Bh | LINKED COMMAND COMPLETE (WITH FLAG) | |
0Ch | BUS DEVICE RESET | |
0Dh | ABORT TAG | |
0Eh | CLEAR QUEUE | |
0Fh | INITIATE RECOVERY | |
10h | RELEASE RECOVERY | |
11h | TERMINATE I/O PROCESS | |
12h-1Fh | Reserved | |
20h | SIMPLE QUEUE TAG | 20nn - where nn is the queue tag |
21h | HEAD OF QUEUE TAG | 21nn - where nn is the queue tag |
22h | ORDERED QUEUE TAG | 22nn - where nn is the queue tag |
23h | IGNORE WIDE RESIDUE | 230i - where i is the number of bytes to ignore (can be 1, 2 or 3) |
24h-2Fh | Reserved for two-byte messages | |
30h-7Fh | Reserved | |
80h-FFh | IDENTIFY |
List of extended message codes
[edit]Value | Length | Message name | Format |
---|---|---|---|
00h | 05h | MODIFY DATA POINTER | 010500aaaa - where aaaa is added to the current data pointer |
01h | 03h | SYNCHRONOUS DATA TRANSFER REQUEST | 010301pprr - where pp is the period and rr is the REQ/ACK offset |
02h | nn | Reserved - was formerly used for the EXTENDED IDENTIFY message in SCSI-1 | 01nn02... |
03h | 02h | WIDE DATA TRANSFER REQUEST | 010203ee - where ee is the transfer width exponent |
04h-7Fh | Reserved | ||
80h-FFh | Vendor-specific |