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Appendix B. SCSI Bus Signal Timing
Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
B–39
B.8.24 PARALLEL PROTOCOL REQUEST Message (04h)
The PARALLEL PROTOCOL REQUEST messages are used to communicate a
synchronous data transfer agreement, a wide data transfer agreement, and set the
protocol options between two SCSI devices (Figure B-6).
Bit
Byte
7
6
5
4
3
2
1
0
0
Extended Message (01h)
1
Extended Message Length (06h)
2
Parallel Protocol Request (04h)
3
Transfer Period Factor
4
Reserved
5
REQ / ACK Offset
6
Transfer Width Exponent (m)
7
Reserved
QAS_Req
DT_Req
IU_Req
NOTE:
Bits 0 – 3 of byte 7 (IU_Req, DT_Req, and QAS_Req) are collectively known as the
Protocol Option bits, and are defined as such in Table B-18.
Figure B–6 PARALLEL PROTOCOL REQUEST Message — Data Format
Summary of Contents for Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB
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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...
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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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