參數(shù)資料
型號: L64781
廠商: LSI CORP
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 25/164頁
文件大?。?/td> 2003K
代理商: L64781
5-50
Registers
Equation 5.8 shows how the value of the DDFS_OFFSET
that compensates for the frequency error is determined in
variable IF mode:
Equation 5.8
where:
B is the channel bandwidth = {6, 7, 8 MHz}.
ε is the difference between the frequency of the XO
and the theoretical frequency in ppm.
Example:
For example, Equation 5.9, if channel bandwidth is
B = 6 MHz, XO = 128/7 + 300 ppm = 18.2912 MHz.
Equation 5.9
5.6 FEC Parameter Registers
These
FEC parameter registers contain conguration information for the
FEC part. When read, they indicate the current parameter value. These
registers are congurable only through the microprocessor.
5.6.1 FEC Parameters Register 1 (0x24)
This is a 6-bit wide, read/write register.
DDFS _OFFSET
2
13
81
ε
+
()
B
-------------------------
1
=
DDFS _OFFSET
2
13
810
6
1
300.10
6
+
()
610
6
------------------------------------------------------------
1
0
x 3552
==
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
RS_BYTE_SEL
TEI
BER_MON
FMODE
BF
OF
l64781.book Page 50 Friday, January 19, 2001 1:28 PM
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