Appendix B. SCSI Bus Signal Timing
B–34
Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
B.8.16.1 HEAD OF QUEUE TAG Message (21h)
The HEAD OF QUEUE TAG message specifies that the task is to be placed first in
the drive’s task queue. An in-progress task is not pre-empted by the command that
accompanies this message. A later task, also received with a HEAD OF QUEUE
TAG message, would be placed at the head of the drive’s task queue for execution in
a last-in, first-out order.
B.8.16.2 ORDERED QUEUE TAG Message (22h)
The ORDERED QUEUE TAG message specifies that the task be placed in the drive’s
task queue for execution in the order received. All tasks placed in the task queue
before this process is received get executed before this process. Except for tasks
received with a HEAD OF QUEUE TAG message, all later tasks are executed after
this task.
B.8.16.3 SIMPLE Message (20h)
(SIMPLE QUEUE TAG)
The SIMPLE message specifies that the task be placed in the drive’s task queue. If
command reordering is enabled, commands queued with a SIMPLE QUEUE TAG
may be executed in an order that optimizes overall drive throughput, though the
execution order will observe the HEAD OF QUEUE TAG and ORDERED QUEUE
TAG message order rules.
B.8.17 RELEASE RECOVERY Message (10h)
The RELEASE RECOVERY message terminates an Auto Contingent Allegiance
condition established by a previous INITIATE RECOVERY message. See Chapter 5
for a description of the drive’s processing done upon Auto Contingent Allegiance
termination. An IDENTIFY Message must immediately precede this message.
The drive rejects the message if there is no Auto Contingent Allegiance condition
active when the message is received or if the host fails to precede it with an
IDENTIFY message.
B.8.18 SAVE DATA POINTER Message (02h)
The SAVE DATA POINTER message is sent from the drive to direct the initiator to
copy the current data pointer to the saved data pointer for the current task. The
message is sent prior to the drive performing a bus disconnect.
Summary of Contents for Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB
Page 15: ...Contents Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives xv...
Page 19: ...Contents Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives xix...
Page 25: ...About This Manual 1 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 55: ...Installation 3 28 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 69: ...SCSI Description 5 2 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 79: ...SCSI Description 5 12 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 81: ...SCSI Description 5 14 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 83: ...SCSI Description 5 16 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 87: ...SCSI Description 5 20 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 89: ...SCSI Description 5 22 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 99: ...SCSI Description 5 32 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 119: ...SCSI Description 5 52 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 125: ...SCSI Description 5 58 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 203: ...SCSI Description 5 136 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 205: ...SCSI Description 5 138 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 213: ...SCSI Description 5 146 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 217: ...SCSI Description 5 150 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 221: ...SCSI Description 5 154 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 231: ...SCSI Description 5 164 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 265: ...SCSI Description 5 198 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 267: ...SCSI Description 5 200 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 269: ...SCSI Description 5 202 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 275: ...SCSI Description 5 208 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 277: ...SCSI Description 5 210 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 279: ...SCSI Description 5 212 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 281: ...SCSI Description 5 214 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 283: ...SCSI Description 5 216 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 285: ...SCSI Description 5 218 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 291: ...SCSI Description 5 224 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 293: ...SCSI Description 5 226 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 295: ...SCSI Description 5 228 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 297: ...SCSI Description 5 230 Quantum Atlas 10K II Ultra160 m SCSI Hard Disk Drives...
Page 315: ...Feature Descriptions 6 14 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 321: ...Appendix A Quick Reference A 6 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 363: ...Appendix B SCSI Bus Signal Timing B 42 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 369: ...Index I 4 Quantum Atlas 10K II Ultra 160 m SCSI Hard Disk Drives...
Page 370: ......
Page 371: ...500 McCarthy Blvd Milpitas CA 95035 408 894 4000 www quantum com June 8 2000 81 122517 04...