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: 160/164页
文件大小: 2003K
代理商: L64781
Demod Parameters Registers
5-25
CONSTELLATION
Constellation Type
D[1:0] R/W
In read mode, CONSTELLATION provides the last value
received by the channel, using the TPS signalling
information.
In write mode, CONSTELLATION stores the next
constellation-type value for the system to use, after
applying it.
The initial value of CONSTELLATION is 10.
5.5 Demod Parameters Registers
The demod
parameter registers contain conguration information. The
readings from these registers indicate the current parameter value.
These
parameter registers are congurable only through the
microprocessor.
5.5.1 Demod Parameters Register 1 (0x07)
This is an 8-bit wide, read/write register.
1
Set this bit to 1.
D7
0
Set these bits to 0.
D[6:5]
AFC_STALL
AFC Loop Updating Freeze
D4 R/W
This bit selects whether the AFC loop works or freezes.
If the loop works, the integrator inside the chip
updates its value from time to time.
CONSTELLATION[1:0]
Denition
0
QPSK
0
1
16-QAM
1
0
64-QAM
1
Reserved
D7
D6
D5
D4
D3
D2
D0
1
0
AFC_STALL
AFC_POL
AFC_SENSITIVITY
l64781.book Page 25 Friday, January 19, 2001 1:28 PM
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