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: 12/164页
文件大小: 2003K
代理商: L64781
Demod Parameters Registers
5-39
where:
InitFreq = DTR_INIT_FREQ[23:0].
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:
If B = 7 MHz and the frequency of the crystal is =
18.2912 = 128/7 + 300 ppm, the value of
DTR_INIT_FREQ is:
Equation 5.2
5.5.15 Demod Parameters Register 19 (0x19)
This is an 8-bit wide, read/write register.
SPI_GAIN_LSB
SPI Gain
D[7:3] R/W
These bits specify the NCO bias frequency in the SPI
block. The initial value of SPI_GAIN (LSB and MSB) is
0b0000110010.
DTR_DSBL
DTR Disable
D2 R/W
This bit species disabling the digital timing recovery
block.
The initial value of DTR_DSBL is 0.
DTR_SENSITIVITY
DTR Sensitivity Gain
D[1:0] R/W
These bits specify the gain sensitivity of the DTR block.
The initial value of DTR_SENSITIVITY is 0b10.
InitFreq
2
25
8
7
---
1
300 10
6
+
() 1
0
x 495183
==
D7
D3
D2
D1
D0
SPI_GAIN_LSB
DTR_DSBL
DTR_SENSITIVITY
DTR_DSBL
Denition
0
Enabled
1
Disabled
l64781.book Page 39 Friday, January 19, 2001 1:28 PM
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