GS2971 datasheet(73/148 Pages) SEMTECH

73 / 148 page

GS2971 3Gb/s, HD, SD SDI Receiver

Data Sheet

45898 - 2

September 2012

73 of 148

4.18.1 TRS Correction & Insertion

When TRS Error Correction and Insertion is enabled, the GS2971 generates and

overwrites TRS code words as required.

TRS Word Generation and Insertion is performed using the timing generated by the

Timing Signal Generator, providing an element of noise immunity over using just the

received TRS information.

This feature is enabled when the IOPROC_EN/DIS pin is HIGH and the

TRS_INS_DISABLE bit in the IOPROC_DISABLE register is set LOW.

NOTE: Inserted TRS code words are always 10-bit compliant, irrespective of the bit

depth of the incoming video stream.

4.18.2 Line Based CRC Correction & Insertion

When CRC Error Correction and Insertion is enabled, the GS2971 generates and inserts

line based CRC words into both the Y and C channels of the data stream.

Line based CRC word generation and insertion only occurs in HD and 3G modes, and is

enabled in when the IOPROC_EN/DIS pin is HIGH and the CRC_INS_DSX_MASK bit in

the IOPROC_X register is set LOW.

4.18.3 Line Number Error Correction & Insertion

When Line Number Error Correction and Insertion is enabled, the GS2971 calculates

and inserts line numbers into the output data stream. Re-calculated line numbers are

inserted into both the Y and C channels.

Line number generation is in accordance with the relevant HD or 3G video standard as

determined by the Automatic Standards Detection block.

This feature is enabled when the device is operating in HD or 3G modes, the

IOPROC_EN/DIS pin is HIGH and the LNUM_INS_DSX_MASK bit in the IOPROC_X

4.18.4 ANC Data Checksum Error Correction & Insertion

When ANC data Checksum Error Correction and Insertion is enabled, the GS2971

generates and inserts ancillary data checksums for all ancillary data words by default.

Where user specified ancillary data has been programmed (see Section 4.17.1), only the

checksums for the programmed ancillary data are corrected.

This feature is enabled when the IOPROC_EN/DIS pin is HIGH and the

ANC_CHECKSUM_INSERTION_DSX_MASK bit in the IOPROC_X register is set LOW.

4.18.5 EDH CRC Correction & Insertion

When EDH CRC Error Correction and Insertion is enabled, the GS2971 generates and

overwrites full field and active picture CRC check-words.

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