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M3099GX/GH OEM Manual 3-11
INTERFACE
SCSI Bus Timing
Unless otherwise indicated, the delay time measurements for each
SCSI device, shown in Table 3.5., shall be calculated from signal
conditions existing at that SCSI device’s own SCSI bus connection.
Thus, these measurements (except cable skew delay) can be made
without considering delays in the cable. The timing characteristics of
each signal are described in the following paragraphs.
Table 3.5 SCSI Bus Timing Values
Timing Description
Arbitration Delay
Assertion Period
Bus Clear Delay
Bus Free Delay
Bus Set Delay
Bus Settle Delay
Cable Skew Delay
Data Release Delay
Deskew Delay
Disconnection Delay
Hold Time
Negation Period
Power-On to Selection Time
Reset to Selection Time
Reset Hold Time
Selection Abort Time
Selection Time-out Delay
Transfer Period
Timing Values
2.4 µs
90 ns
800 ns
800 ns
1.8 µs
400 ns
10 ns
400 ns
45 ns
200 µs
45 ns
90 ns
10 s recommended
25 µs
200 µs
200 µs
250 ms recommended
set during an SDTR message
#03.pm5 98.2.22, 1:31 PM11