SCOEFF (Symbol Tracking Loop Filter Coefficients)

Address

: 2F

Type

: R/W

Reset

: 0001 1100

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

DMX-OF

0

PLF_A

PLF_B

DMX-OF : Symbol tracking control : 0 = QPSK, 1 = FM.

In QPSK mode, the symbol tracking loop is closed.

PLF_A

: A coefficient (proportional)

Programme the symbol tracking loop filter proportional coefficient A :

PLF_A [5:3]

Value

000

0

001

1

010

2

011

4

100

8

101

16

110

32

111

Not used

PLF_B

: B coefficient (integral)

Program the symbol tracking loop filter integral coefficient B :

PLF_B [2:0]

Value

000

0

001

1/16

010

1/32

011

1/64

100

1/128

101

1/256

110

1/512

111

1/1024

SRF (Symbol Tracking Loop Frequency)

Address

: 30

Type

: R/W

Reset

: 0000 0000

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

SYMBOL RECOVERY FREQUENCY

This register provides access to the control signal for the symbol tracking loop (2’s complement). If read,

it indicates a value proportional to the symbol tracking frequency error. If written to, it will preset the

frequency error.

SRF [7:0]

Approx. Error (kHz)

10000000

-8

00000000

0

01111111

+8

RESET

After a reset sequence, all the registers controllable by AUTOSTANDARD function (FIR, COFQ, FIFQ,

ACOEFF, BCOEFF, SCOEFF, SRF) are adjusted for the standard I configuration (channel 1 to FM mono

mode and channel 2 to QPSK mode).

PROGRAMMING THE DEVICE (continued)

STV8203

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