Scsi Message System; Supported Messages - IBM Ultrastar 36LZX Specifications

10.0 SCSI Message System

This chapter details how the message system is implemented on the drive. Included is a functional
description of the supported messages.

10.1 Supported Messages

The messages supported by the drive are listed in the figure below.
MESSAGE
COMMAND COMPLETE
SYNCHRONOUS DATA TRANSFER REQUEST
WIDE DATA TRANSFER REQUEST*
PARALLEL PROTOCOL 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, OUT = Initiator to target
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 166. Supported Messages
If an unsupported message is received, the drive will send the MESSAGE REJECT message to the initi-
ator. If at the time the unsupported message is received a valid NEXUS exists, the drive will continue
with the command. If no valid NEXUS exists, the drive will go to Bus Free.
CODE(hex)
00
010301
010203
010604
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
20XX
21XX
22XX
2301
80-FF
80-FF
Ultrastar 36LZX hard disk drive specifications
Direction
IN
IN OUT
IN OUT
IN OUT
IN
IN
IN
OUT
OUT
IN OUT
OUT
OUT
IN
IN
OUT
OUT
OUT
IN OUT
OUT
OUT
IN
IN
OUT
191
Negate ATN
Before last ACK
–––
Yes
Yes
Yes
–––
–––
–––
Yes
Yes
Yes
Yes
Yes
–––
–––
Yes
Yes
Yes
No
No
No
–––
–––
No