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Table 6.42
SCSI-2 Fast Transfers 10.0 Mbytes (8-Bit Transfers) or 20.0 Mbytes
(16-Bit Transfers) 40 MHz Clock
Symbol
Parameter
t
Send SREQ/ or SACK/ assertion pulse width
1
t
Send SREQ/ or SACK/ deassertion pulse width
2
t
Receive SREQ/ or SACK/ assertion pulse width
1
t
Receive SREQ/ or SACK/ deassertion pulse width
2
t
Send data setup to SREQ/ or SACK/ asserted
3
t
Send data hold from SREQ/ or SACK/ asserted
4
t
Receive data setup to SREQ/ or SACK/ asserted
5
t
Receive data hold from SREQ/ or SACK/ asserted
6
Table 6.43
Ultra SCSI Transfers 20.0 Mbytes (8-Bit Transfers) or
40.0 Mbytes (16-Bit Transfers) Quadrupled 40 MHz Clock
Symbol
Parameter
t
Send SREQ/ or SACK/ assertion pulse width
1
t
Send SREQ/ or SACK/ deassertion pulse width
2
t
Receive SREQ/ or SACK/ assertion pulse width
1
t
Receive SREQ/ or SACK/ deassertion pulse width
2
t
Send data setup to SREQ/ or SACK/ asserted
3
t
Send data hold from SREQ/ or SACK/ asserted
4
t
Receive data setup to SREQ/ or SACK/ asserted
5
t
Receive data hold from SREQ/ or SACK/ asserted
6
1. Transfer period bits (bits [6:4] in the
Clock Cycle of Data Setup bit (bit 7 in
2. During Ultra SCSI transfers, the value of the Extend REQ/ACK Filtering bit
(STEST2), bit 1) has no effect.
6-56
SCSI Transfer (SXFER)
SCSI Control One
Electrical Specifications
Min
30
30
22
22
24
34
14
24
1, 2
Min
15
15
11
11
12
17
6
11
register) are set to zero and the Extra
(SCNTL1)) is set.
(SCSI Test Two
Max
Unit
–
ns
–
ns
–
ns
–
ns
–
ns
–
ns
–
ns
–
ns
Max
Unit
–
ns
–
ns
–
ns
–
ns
–
ns
–
ns
–
ns
–
ns
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