STA400A datasheet(47/117 Pages) STMICROELECTRONICS

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STA400A

b5:

CARINTG_CLR 0=Carrier Integrator Cleared; 1=Carrier Integrator Active

b4:

CLR_RAMP

0=Ramp Cleared; 1=Ramp Active

b3-b0:RFU

NULOFS_WIN

- Null Carrier Offset Window

The CarrierNullOffset block writes the new IF Frequency in the Carrier NCO if the demodulator lock signal is low

for a period of time equal to the value written in this register. The window length is given in msec.

b3-b0:

NULOFS_WIN 0000 -> 10msec

0100 -> 50msec

1000 -> 175msec

1100 -> 350msec

0001 -> 20msec

0101 -> 100msec 1001 -> 200msec

1101 -> 400msec

0010 -> 30msec

0110 -> 125msec 1010 -> 250msec

1110 -> 450msec

0011 -> 40msec

0111 -> 150msec 1011 -> 300msec

1111 -> 500msec

NULOFS_DELTAF

- Null Carrier Offset Delta Frequency

The CarrierNullOffset block subtracts from the locked carrier frequency the value contains in this register before

writing the new IF Frequency in the Carrier NCO. The register format is two’s complent.

Given a frequency FREQ in Hz, the value to load in the register is given by:

where Int(.) is the integer function.

TIMLPF_CTRL - Timing Loop Filter Control

This register controls the operation of the Timing Loop Filter.

b7:

TIMAVG_OFF

0=Self-Noise Filter enabled; 1=Self-Noise Filter disabled.

b6-b5:

TIMINTG_CLR_WIN

00 -> Window=10sec

10 -> Window=40sec

01 -> Window=20sec

11 -> Window=60sec

b4:

TIMINTG_CLR_EN

0=TimintgCtrl block disabled; 1=TimintgCtrl block enabled

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

NULOFS_WIN

S1/S2

0074/009A

3-0

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

NULOFS_DELTAF

S1/S2

0075/009B

7-0

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

TIMLPF_CTRL

S1/S2

0076/009C

7-0

NU LOF S_D ELT AF

Int F REQ

512F

MC LK

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0.5

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