Specifications

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