Avago Technologies LSI53C825AE - Manual (Page 121)

Operating Registers 4-33
Table 4.4 and Table 4.5 show examples of possible bit
combinations.
Table 4.4 Examples of Synchronous Transfer
Periods and Rates for SCSI-1
CLK
(MHz)
SCSI
CLK
÷
SCNTL3
Bits [6:4] XFERP
Synch.
Transfer
Period (ns)
Synch.
Send Rate
(Mbytes)
Synch.
Receive
Rate
(Mbytes)
66.67 3 4 180 5.55 5.55
66.67 3 5 225 4.44 5.55
50 2 4 160 6.25 6.25
50 2 5 200 5 6.25
40 2 4 200 5 5
37.50 1.5 4 160 6.25 6.25
33.33 1.5 4 180 5.55 5.55
25 1 4 160 6.25 6.25
20 1 4 200 5 5
16.67 1 4 240 4.17 4.17
Table 4.5 Example Transfer Periods and Rates for
Fast SCSI-2
CLK
(MHz)
SCSI
CLK
÷
SCNTL3
Bits [6:4] XFERP
Synch.
Transfer
Period
(ns)
Synch.
Transfer
Rate
(Mbytes)
Synch.
Receive
Transfer
Rate
(Mbytes)
66.67 1.5 4 90 11.11 11.11
66.67 1.5 5 112.5 8.88 11.11
50 1 4 80 12.5 12.5
50 1 5 100 10.0 12.5
40 1 4 100 10.0 10.0
37.50 1 4 106.67 9.375 9.375
33.33 1 4 120 8.33 8.33
25 1 4 160 6.25 6.25
20 1 4 200 5 5
16.67 1 4 240 4.17 4.17