Scsi Message System; Supported Messages - IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications
3.5-inch hard disk drive ( 9130 / 4560 mb )
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9.0 SCSI MESSAGE SYSTEM
This chapter details how the message system is implemented on the file. Included is a functional description
of the supported messages.
9.1 Supported Messages
The message supported by the file is shows in Figure 125.
MESSAGE
COMMAND COMPLETE
SYNCHRONOUS DATA TRANSFER REQUEST 010301
WIDE DATA TRANSFER REQUEST*
SAVE DATA POINTER
RESTORE POINTERS
DISCONNECT
INITIATOR DETECTED ERROR
ABORT
MESSAGE REJECT
NO OPERATION
MESSAGE PARITY ERROR
LINKED COMMAND COMPLETE
LINKED COMMAND COMPLETE (w/FLAG)
BUS DEVICE RESET
ABORT TAG
CLEAR QUEUE TAG
SIMPLE QUEUE TAG
HEAD OF QUEUE TAG
ORDERED QUEUE TAG
IGNORE WIDE RESIDUE*
IDENTIFY
IDENTIFY
Key:
IN = Target to Initiator,
YES = Initiator shall negate ATN before last ACK of message.
NO = Initiator may or may not negate ATN before last ACK
of message.
= Not applicable
XX = Queue Tag
*
= Wide SCSI Only
Figure 125. Supported Messages
If an unsupported message is received, the file will send the MESSAGE REJECT message to the initiator. If
at the time the unsupported message is received a valid NEXUS exists then the file will continue with the
command. If no valid NEXUS exists then the file will go to Bus Free.
Copyright IBM Corp. 1997
CODE
Direction
Negate ATN
(hex)
Before last ACK
00
IN
IN
OUT
010203
IN
OUT
02
IN
03
IN
04
IN
05
OUT
06
OUT
07
IN
OUT
08
OUT
09
OUT
0A
IN
0B
IN
0C
OUT
0D
OUT
0E
OUT
20XX
IN
OUT
21XX
OUT
22XX
OUT
2301
IN
80 FF
IN
80 FF
OUT
OUT = Initiator to target.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
163
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