Справочник Пользователя для LSI 53C810A
5-13
Use the following formula to calculate the synchronous
send and receive rates.
send and receive rates.
and
show
examples of possible bit combinations.
Synchronous Send Rate = (SCLK/SCF)/XFERP
Synchronous Receive Rate = (SCLK/SCF) /4
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]
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
for SCSI-1
SCLK
(MHz)
(MHz)
SCF
÷
SCNTL3
Bits [6:4]
XFERP
SXFER
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