Avago Technologies LSI53C876E - Manual (Page 291)

AC Characteristics 6-59
Table 6.48 SCSI-2 Fast Transfers (10.0 Mbytes/s (8-Bit Transfers) or 20.0 Mbytes/s
(16-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
Table 6.49 SCSI-2 Fast-20 SE Transfers (20.0 Mbytes/s (8-Bit Transfers) or
40.0 Mbytes/s (16-Bit Transfers), 80 MHz Clock) with Clock Doubled
Internally
Symbol Parameter Min Max Unit
t
1
Send SREQ/ or SACK/ assertion pulse width 16 – ns
t
2
Send SREQ/ or SACK/ deassertion pulse width 16 – ns
t
1
Receive SREQ/ or SACK/ assertion pulse width 10 – ns
t
2
Receive SREQ/ or SACK/ deassertion pulse width 10 – ns
t
3
Send data setup to SREQ/ or SACK/ asserted 12 – ns
t
4
Send data hold from SREQ/ or SACK/ asserted 17 – ns
t
5
Receive data setup to SREQ/ or SACK/ asserted 0 – ns
t
6
Receive data hold from SREQ/ or SACK/ asserted 6 – ns