7.6 Bus Phases
1)If (n⋅ T1) ≥ (T2 + 700),
Average data transfer rate in SCSI = 1000/T1 (MB/s)
2)If (n⋅ T1) > (T2 + 700),
Average data transfer rate in SCSI = (n⋅ 1000)/(T2 + 700) (MB/s)
where,
n:Value assigned to REQ/ACK Offset parameter
T1: Value in ns assigned to Transfer Period parameter (see Table 7.9)
T2: Average time in ns from REQi pulse transmission to corresponding ACKi response at the pertinent pins of the SCSI connector on the ODD
Table 7.9 Parameters used for synchronous data transfer
Parameter |
| Value |
| Transter rate |
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REQ/ACK Offset |
| 1 to 16 |
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Transfer Period | X '0C' | (50 ns) | Max. | 20.0 | MB/s*1 | ||
(Minimum REQ Interval sent |
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X '12' | (75 ns) | Max. | 13.3 | MB/s*1 | |||
from ODD) | |||||||
(T1 in Figure 7.21) | X '19' | (100 ns) | Max. | 10.0 | MB/s* | 1 | |
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| X '25' | (150 ns) | Max. | 6.6 MB/s*1 |
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| X '32' | (200 ns) | Max. | 5.0 MB/s*1 |
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| X '3E' | (250 ns) | Max. | 4.0 MB/s*1 |
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| X '4B' | (300 ns) | Max. | 3.3 MB/s*1 |
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*1. If a
