L64704 LSI Logic Corporation, L64704 Datasheet - Page 82

• Manufacturer Part Number: L64704
• Description: Satellite Decoder Technical Manual 5/97
• Manufacturer: LSI Logic Corporation

3.6.30
Group 4,
APR 35
Decoder
Configuration
Register
3-50
APR
35
SNR_EST
D7
CON_SEL
This resister contains the various control bits that are used to configure
the L64704 Decoder logic.
Read/Write: R/W
SNR_EST
CON_SEL
Set to 0
FP_LOCK_LEN
L64704 Registers
D6
Set to 0
D5
SNR Estimator On/Off
Set this bit to enable or disable the SNR Estimator circuit.
Constellation Selector
Set this bit to indicate the format of the input data.
Set to 0
You must set this bit to 0 for normal operation
Frequency/Phase Lock Detector Length
Program this bit in conjunction with the Carrier Threshold
field (Group 4, APR 27) to set the phase lock detector
estimation period. For details, see Section
“Phase Lock Detection.”
D7
0
1
D6
0
1
D4
0
1
FP_LOCK_
SNR Estimator
Off
On
Definition
QPSK
BPSK
Estimation Period
Normal (Long)
Short
LEN
D4
PWRP
D3
D2
Set to 0
D1
5.6.1.5,
I_FORMAT
D0
7
6
5
4