LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 291

• Manufacturer Part Number: LSI53C875
• Description: PCI to Ultra SCSI I/O Processor
• Manufacturer: LSI Logic

Table 7.26
Table 7.27
1. Analysis of system configuration is recommended due to reduced driver skew margin in differential
Notes: Transfer period bits (bits [7:5] in the
Symbol
Symbol
systems.
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
1
2
1
2
3
4
5
6
1
2
1
2
3
4
5
6
Extra Clock Cycle of Data Setup bit (bit 7 in
set the TolerANT Enable bit (bit 7 in
Parameter
Send SREQ/ or SACK/ assertion pulse width
Send SREQ/ or SACK/ deassertion pulse width
Receive SREQ/ or SACK/ assertion pulse width
Receive SREQ/ or SACK/ deassertion pulse width
Send data setup to SREQ/ or SACK/ asserted
Send data hold from SREQ/ or SACK/ asserted
Receive data setup to SREQ/ or SACK/ asserted
Receive data hold from SREQ/ or SACK/ asserted
Parameter
Send SREQ/ or SACK/ assertion pulse width
Send SREQ/ or SACK/ deassertion pulse width
Receive SREQ/ or SACK/ assertion pulse width
Receive SREQ/ or SACK/ deassertion pulse width
Send data setup to SREQ/ or SACK/ asserted
Send data hold from SREQ/ or SACK/ asserted
Receive data setup to SREQ/ or SACK/ asserted
Receive data hold from SREQ/ or SACK/ asserted
SCSI-2 Fast Transfers 10.0 Mbytes/s (8-Bit Transfers) or 20.0 Mbytes/s
(16-Bit Transfers), 40 MHz Clock
SCSI-2 Fast Transfers 10.0 Mbytes/s (8-Bit Transfers) or 20.0 Mbytes/s
(16-Bit Transfers), 50 MHz Clock
SCSI Timing Diagrams
SCSI Transfer (SXFER)
SCSI Test Three
SCSI Control One
(STEST3)).
register) are set to zero and the
(SCNTL1)) is set. For Fast SCSI,
Min
Min
40
35
40
35
35
20
20
33
10
35
20
20
33
10
0
0
1
Max
Max
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Unit
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
7-55