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SCSI Timings 7-31
Table 7.21 SCSI-1 Transfers (SE, 5.0 Mbytes/s)
Symbol Parameter Min Max Unit
t
1
Send SREQ/ or SACK/ assertion pulse width 90 – ns
t
2
Send SREQ/ or SACK/ deassertion pulse width 90 – ns
t
1
Receive SREQ/ or SACK/ assertion pulse width 90 – ns
t
2
Receive SREQ/ or SACK/ deassertion pulse width 90 – ns
t
3
Send data setup to SREQ/ or SACK/ asserted 55 – ns
t
4
Send data hold from SREQ/ or SACK/ asserted 100 – ns
t
5
Receive data setup to SREQ/ or SACK/ asserted 0 – ns
t
6
Receive data hold from SREQ/ or SACK/ asserted 45 – ns
Table 7.22 SCSI-2 Fast Transfers (10.0 Mbytes/s (8-Bit Transfers), 40 MHz Clock)
Symbol Parameter Min Max Unit
t
1
Send SREQ/ or SACK/ assertion pulse width 35 – ns
t
2
Send SREQ/ or SACK/ deassertion pulse width 35 – ns
t
1
Receive SREQ/ or SACK/ assertion pulse width 20 – ns
t
2
Receive SREQ/ or SACK/deassertion pulse width 20 – ns
t
3
Send data setup to SREQ/ or SACK/ asserted 33 – ns
t
4
Send data hold from SREQ/ or SACK/ asserted 45 – ns
t
5
Receive data setup to SREQ/ or SACK/ asserted 0 – ns
t
6
Receive data hold from SREQ/ or SACK/ asserted 10 – ns