L64704 LSI Logic Corporation, L64704 Datasheet - Page 80

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

3-48
CAR_OUT_SEL
CAR_PED_SEL
L64704 Registers
Register bits [5:4] to zero. For more information, see
Section
This bit should always be set to 0 when CAR_OUT_SEL
is set to 1.
Carrier Loop Output Selector
Use this bit to route the Phase Error Detector outputs to
the Carrier Loop output pins instead of the Sigma-Delta
circuit outputs. This allows a full range of frequencies to
be decoded by using an external DAC for low baud rate
operation. For more information, see Section
“Low Baud Rate Operation.”
The output pin assignments when using the
CAR_OUT_SEL bit are:
Carrier Phase Error Detector Select
Program this bit to select which phase error estimator will
be used for carrier phase tracking. For details, see
Section 5.6.2, “Carrier Phase Tracking,”
D4
0
1
Output Pin Name
CAR_PED.0
CAR_PED.1
CAR_VCO1P
CAR_VCO2P
CAR_VCO1N
CAR_VCO2N
D2
0
1
CAR_VCO1N/P Pins
Active
3-state
Estimator Selected
Decision Directed Maximum Likelihood (DDML)
Non-Data Aided Maximum Likelihood (NDAML)
5.6, “Carrier Synchronizer.”
CAR_PED.0
CAR_PED.1
CAR_VCO1P
CAR_VCO2P
CAR_VCO1N
CAR_VCO2N
0
CAR_OUT_SEL
CAR_PED.0
CAR_PED.1
CAR_PED.2
CAR_PED.3
CAR_PED.4
CAR_PED.5
and
1
Figure
5.6.2.3,
5.9.
3
2