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SCSI Description
5–8
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
Bit
7
6
5
4
3
2
1
0
Byte
5
Vendor Specific
Reserved
NACA
Flag
Link
Figure 5–2 Command Descriptor Block Control Field — Data Format
Table 5–3 Command Descriptor Block Control Field — Field Descriptions
Field
Description
Vendor Specific Bits
These bits must be 0.
NACA
Normal Auto-Contingent Allegiance - This bit
must be zero
to indicate
that SCSI-2 Contingent Allegiance rules apply.
Link Bit
A Link bit set to one signals that the initiator requests continuation of a
task (I/O Process) across two or more SCSI commands. If the Link bit is
one and the flag bit is zero, and the command completes successfully,
the drive will continue the task and return a status of INTERMEDIATE and
a service response of Linked Command Complete.
If the Link bit and the Flag bit of the Control word are both set to one,
and the drive completes a command with a status of INTERMEDIATE, the
drive shall return a service response of Linked Command Complete (with
Flag). Refer to Section 5.6 for Linked Commands description.
Flag Bit
The Flag bit is used in conjunction with the Link Bit to notify the initiator
in an expedient manner that a command has been completed. Aflag bit
set to 1 is valid only when the Link Bit is set to 1.
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...
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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...
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