参数资料
型号: L64781
厂商: LSI CORP
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封装: PLASTIC, QFP-100
文件页数: 14/164页
文件大小: 2003K
代理商: L64781
5-40
Registers
The DTR_SENSITIVITY register controls the frequency
range generated by the accumulator of the DTR. Its
default value is 2.
Equation 5.3 shows how the value of the sensitivity is
determined:
Equation 5.3
where:
B is the channel bandwidth = {6, 7, 8 MHz}.
g is the guard interval = {1/32, 1/16, 1/8, 1/4}.
f
s is the frequency of the crystal.
The value of the DTR_DENSITIVITY is determined
according to the value of K:
If 10.5 < = K < 9.5 then the DTR_SENSITIVITY is
0b11.
If 11.5 <=K< 10.5 then the DTR_SENSITIVITY is
0b10.
If 12.5 <=K< 11.5 then the DTR_SENSITIVITY is
0b01.
If K < = 12.5 then the DTR_SENSITIVITY is 0b00.
Table 5.4, Table 5.5, and Table 5.6 give the values of K
for different crystal frequencies, channel bandwidths, and
guard intervals. Note that K is always between
10.5 and
11.5. This means that the default value of the
DTR_SENSITIVITY does not have to change.
K
2
f
S
710
6
B
1
g
+
() 2
15
----------------------------------------
log
=
Table 5.4
18.2912 MHz XO (128/7 + 300 PM)
Bandwidth\Guard
1/32
1/16
1/8
1/4
8 MHz
11.043962
11.087030
11.169492
11.321495
7 MHz
10.851316
10.894385
10.976848
11.128850
6 MHz
10.628923
10.671992
10.754455
10.906458
l64781.book Page 40 Friday, January 19, 2001 1:28 PM
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