Conner CFP4207 Series, Product Manual

Page: 74 / 81

Chapter 5 SCSI Physical Characteristics
Page 66 Filepro CFP4207 Series
Interface Timing Requirements
Unless otherwise noted, the delay-time measurements are calculated from signal
conditions existing at the drive's own SCSI bus connector. Normally these
measurements (except cable skew delay) can be made without considering delays
in the cable.
Table 5-20
SCSI Bus Timing Values
Timing Value
Timing Description fast slow asynch
Arbitration Delay 2.4
µ
s 2.4
µ
s 2.4
µ
s
Bus Clear Delay
800 ns 800 ns 800 ns
Bus Free Delay
800 ns 800 ns 800 ns
Bus Set Delay 1.8
µ
s 1.8
µ
s 1.8
µ
s
Bus Settle Delay 400 ns 400 ns 400 ns
Cable Skew Delay
1
4 ns 4 ns 4 ns
Data Release Delay 400 ns 400 ns 400 ns
Receive Assertion Period 22 ns 70 ns n/a
Receive Hold Time 25 ns 25 ns n/a
Receive Negation Period 22 ns 70 ns n/a
Receive Setup Time 15 ns 15 ns n/a
Reset Hold Time 25
µ
s 25
µ
s 25
µ
s
Selection Abort Time 200
µ
s
200
µ
s
200
µ
s
Selection Time-out Delay
2
250 ms 250 ms 250 ms
System Deskew Delay 20 ns 45 ns 45 ns
Transmit Assertion Period 30 ns 80 ns n/a
Transmit Hold Time 33 ns 53 ns n/a
Transmit Negation Period 30 ns 80 ns n/a
Transmit Setup Time 23 ns 23 ns n/a
Notes:
1
This time does not apply at the SCSI connector of the drive.
2
This is a recommended time. It is not mandatory.