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Appendix B. SCSI Bus Signal Timing
B–6
Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
Table B–4 Double Transition (DT) SCSI Bus Data and Information Phase Timing
Values (Note 4)
Timing Description
Fast-10
Fast-20
Fast-40
Fast-80
ATN Transmit Setup Time
48.4 ns
29.2 ns
19.6 ns
14.8 ns
ATN Receive Setup Time
13.6 ns
7.8 ns
4.9 ns
3.45 ns
Cable Skew (note 1)
4 ns
3 ns
2.5 ns
2.5 ns
pCRC Receive Hold Time
10.2 ns
5.1 ns
2.55 ns
1.45 ns
pCRC Receive Setup Time
20.2 ns
15.1 ns
12.55 ns
11.45 ns
pCRC Transmit Hold Time
37 ns
18.5 ns
9.25 ns
4.8 ns
pCRC Transmit Setup Time
47 ns
28.5 ns
19.25 ns
14.8 ns
Receive Assertion Period (note 2)
80 ns
40 ns
20 ns
10 ns
Receive Hold Time (note 2 and note 3)
11.6 ns
5.8 ns
2.9 ns
1.45 ns
Receive Negation Period (note 2)
80 ns
40 ns
20 ns
10 ns
Receive Setup Time (note 2 and note 3)
11.6 ns
5.8 ns
2.9 ns
1.45 ns
Receive REQ (ACK) Period Tolerance
0.7 ns
0.7 ns
0.7 ns
0.7 ns
Signal Timing Skew
26.8 ns
13.4 ns
6.7 ns
3.35 ns
REQ (ACK) Period
200 ns
100 ns
50 ns
25 ns
Transmit Assertion Period (note 2)
92 ns
46 ns
23 ns
11.5 ns
Transmit Hold Time (note 2 and note 3)
38.4 ns
19.2 ns
9.6 ns
4.8 ns
Transmit Negation Period (note 2)
92 ns
46 ns
23 ns
11.5 ns
Transmit Setup Time (note 2 and note 3)
38.4 ns
19.2 ns
9.6 ns
4.8 ns
Transmit REQ (ACK) Period Tolerance
0.6 ns
0.6 ns
0.6 ns
0.6 ns
Notes:
1
Cable Skew is measured at each device connection with the transmitted skew subtracted from
the received skew.
2
See SPI-3 specifications for measurement points.
3
See SPI-3 specifications for examples of how to calculate setup and hold timing.
4
SCSI bus timing values specified by the maximum transfer rate for the given range shall apply
even if a slower transfer rate within the given range is negotiated.
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...
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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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