GS3471 datasheet(68/179 Pages) SEMTECH

68 / 179 page

GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

68 of 179

Semtech

www.semtech.com

4.20.2 ANC Processing

The GS3471 can correct errors by inserting corrected code words, checksums, and CRC

values into the data stream. The following processing can be performed by the GS3471:

1. TRS insertion

2. HD line based CRC insertion

3. EDH CRC insertion

4. HD line number insertion

5. Illegal code re-mapping

6. Ancillary data checksum insertion

7. Audio extraction

8. Ancillary data extraction

9. PID regeneration

All of the above features are only available in SMPTE mode (SMPTE_BYPASS = HIGH). To

enable these features, the IOPROC_EN bit must be set HIGH, and the individual feature

must be enabled via bits in the IOPROC_1 and/or IOPROC_2 (depending on the data

stream) register(s).

The IOPROC_1 and IOPROC_2 registers contains one bit for each processing feature

allowing each one to be enabled/disabled individually.

By default (at power-up or after device reset), all of the IOPROC_1 and IOPROC_2

processing features.

To disable an individual processing feature, set the corresponding bit to one (1) in the

IOPROC_1 and/or IOPROC_2 register(s).

Table 4-15: IOPROC_1 and IOPROC_2 Register Bits

Processing Feature

IOPROC_1 Register Bit

IOPROC_2 Register Bit

TRS insertion

TRS_INS_DS1_MASK

TRS_INS_DS2_MASK

Y and C line based CRC insertion

CRC_INS_DS1_MASK

CRC_INS_DS2_MASK

Y and C line number insertion

LNUM_INS_DS1_MASK

LNUM_INS_DS2_MASK

Ancillary data check sum insertion

ANC_CHECKSUM_INSERTION_DS1_MASK

ANC_CHECKSUM_INSERTION_DS2_MASK

EDH CRC insertion

EDH_CRC_INS_MASK

N/A

Illegal code re-mapping

ILLEGAL_WORD_REMAP_DS1_MASK

ILLEGAL_WORD_REMAP_DS2_MASK

H timing signal configuration

H_CONFIG

N/A

Update EDH Flags

EDH_FLAG_UPDATE_MASK

N/A

Audio Data Extraction

AUD_EXT_MASK

AUDIO_SEL_DS2_DS1

Ancillary Data Extraction

ANC_DATA_EXT_MASK

ANC_EXT_SEL_DS2_DS1,

ANC_EXT_SEL_DS1_Y_DS2_Y

Regeneration of ST 352 packets

N/A

REGEN_352M_MASK

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