STA400A datasheet(84/117 Pages) STMICROELECTRONICS

84 / 117 page

STA400A

84/117

TDM soft-symbol stream within a medium range dropout condition.

2.5 FEC

Control_F

- FEC Control Register

The control flags enable the corresponding operation if set, otherwise the operation is disabled. The flags fec_en

and fec_prep enable the operation of the FEC and FEC Preprocessing. Weighting of the two satellite data

streams is performed only when wgt_en=1, otherwise the data from the memory are not weighted. The flags

terr_format and sat_format determine the Viterbi input data format for both terrestrial and satellite data streams.

As only one Viterbi Decoder is applied both flags have to be equal. The Viterbi flush operation is enabled at the

end of a PRC packet when vd_flush_on=1.

b5 :

vd_flush_on

‘0’= VD flush disabled

‘1’= VD flush enabled

b4 :

sat_format

‘0’= satellite data in two’s complement (Viterbi input)

‘1’= satellite data in offset binary (Viterbi input)

b3 :

terr_format

‘0’= terrstrial data in two’s complement (Viterbi input)

‘1’= terrestrial data in offset binary (Viterbi input)

b2 :

wgt_en

‘0’= Satellite Weighting disabled

‘1’= Satellite Weighting enabled

b1 :

fec_prep_en

‘0’= FEC Preprocessing disabled

‘1’= FEC Preprocessing enabled

b0 :

fec_en

‘0’= FEC disabled

‘1’= FEC enabled

Status_F

- FEC Status Register

The status vector comprises the status flags of the sub-modules of the FEC Processing. An inactive module is

indicated by status=0, an active module by status=1

b3 :

FEC Preprocessing

‘0’= FEC Preprocessing inactive

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

FspSecuAlignThr_S2

02CB

2-0

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

Control_F

0300

5-0

Type:

SingleByte - R

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

Status_F

0301

3-0

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