LSI 53C810A - Manual (Page 87)

5-13
Use the following formula to calculate the synchronous
send and receive rates.
Table 5.3 and Table 5.4 show
examples of possible bit combinations.
Synchronous Send Rate = (SCLK/SCF)/XFERP
Synchronous Receive Rate = (SCLK/SCF) /4
Where:
TP2 TP1 TP0 XFERP
0 0 0 4
0 0 1 5
0 1 0 6
0 1 1 7
1 0 0 8
1 0 1 9
1 1 0 10
1 1 1 11
SCLK SCSI clock
SCF Synchronous Clock Conversion Factor,
SCNTL3 register, bits [6:4]
XFERP Transfer period, SXFER register, bits [7:5]
Table 5.3 Examples of Synchronous Transfer Periods and Rates
for SCSI-1
SCLK
(MHz)
SCF
÷
SCNTL3
Bits [6:4]
XFERP
SXFER
Bits [7:5]
Synch.
Send Rate
(Mbytes/s)
Synch.
Send
Period (ns)
Synch.
Receive
Rate
(Mbytes/s)
Synch.
Receive
Period (ns)
66.67 3 4 5.55 180 5.55 180
66.67 3 5 4.44 225 5.55 180
50 2 4 6.25 160 6.25 160
50 2 5 5 200 6.25 160