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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
0004
0015
0106
0117
1008
1019
11010
11111
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