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10.0 SCSI Message System
This chapter describes 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
TASK COMPLETE
SYNCHRONOUS DATA TRANSFER REQUEST
WIDE DATA TRANSFER REQUEST*
PARALLEL PROTOCOL REQUEST
SAVE DATA POINTER
RESTORE POINTERS
DISCONNECT
INITIATOR DETECTED ERROR
ABORT TASK SET
MESSAGE REJECT
NO OPERATION
MESSAGE PARITY ERROR
LINKED COMMAND COMPLETE
LINKED COMMAND COMPLETE (w/FLAG)
TARGET RESET
ABORT TASK
CLEAR TASK SET
SIMPLE
HEAD OF QUEUE
ORDERED
IGNORE WIDE RESIDUE*
IDENTIFY
IDENTIFY
Key:
IN
= Drive to Initiator
OUT = Initiator to Drive
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 177. Supported Messages
CODE (hex)
Ultrastar 146Z10 hard disk drive specifications
177
Direction
00
IN
010301
IN
010203
IN
010604
IN
02
IN
03
IN
04
IN
05
06
07
IN
08
09
0A
IN
0B
IN
0C
0D
0E
20XX
IN
21XX
22XX
2301
IN
80-FF
IN
80-FF
Negate ATN
before last
ACK
–––
OUT
Yes
OUT
Yes
OUT
Yes
–––
–––
OUT
–––
OUT
Yes
OUT
Yes
OUT
Yes
OUT
Yes
OUT
Yes
–––
–––
OUT
Yes
OUT
Yes
OUT
Yes
OUT
No
OUT
No
OUT
No
–––
–––
OUT
No
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