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: 163/164页
文件大小: 2003K
代理商: L64781
5-28
Registers
Three OBC accesses are necessary to update the
overall register, so rst stall the integrator by setting
AFC_STALL to 1, then update the values. Unfreeze
the process by setting AFC_STALL back to 0.
The initial value of AFC_INIT_FREQ is 0 in all three
registers.
5.5.3 Demod Parameters Register 5 (0x0B)
This is an 8-bit wide, read/write register.
SOFT_BIT
Soft Bit Decision
D7 R/W
If this bit is 0, the L64781 produces three soft bit
decisions. If it is 1, it produces four soft bit decisions.
The initial value of SOFT_BIT is 1.
0
Set these bits to 0.
D[6:5]
DOF_OUT_SEL
CHIP Output Format
D[4:3] R/W
DOF_OUT_SEL species the presentation of soft
decisions and also which code rate (HP or LP) the
FEC_RATE output signal presents to the FEC block.
The initial value of the DOF_OUT_SEL is 00.
D7
D6
D5
D4
D3
D2
D1
D0
SOFT_BIT
0
DOF_OUT_SEL
DDFS_
DISABLE
DOF_EXT
QUIET
ADCON
SOFT_BIT
Denition
0
3 Soft Bit Decision
1
4 Soft Bit Decision
DOF_OUT_SEL[1:0] Denition
X
Useless in nonhierarchical mode and
FEC_RATE = HP_code_rate.
0
X
HP stream towards the FEC and
FEC_RATE = HP_code_rate.
1
X
LP stream towards the FEC and
FEC_RATE = LP_code_rate.
X
0
HP stream towards the external output.
X
1
LP stream towards the external output
l64781.book Page 28 Friday, January 19, 2001 1:28 PM
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