GS3470 datasheet(65/169 Pages) SEMTECH

65 / 169 page

GS3470

Final Data Sheet

Rev.8

PDS-060500

September 2017

65 of 169

Semtech

www.semtech.com

4.18.3 TRS Insertion

When TRS Insertion is enabled, the GS3470 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 bit is HIGH and the TRS_INS_DS1_MASK

or TRS_INS_DS2_MASK bits in the IOPROC_1 or IOPROC_2 registers are set LOW. The

TRS_INS_DS1_MASK bit is in the IOPROC_1 register and is used to enable/disable TRS

insertion for SD, HD, 3G-A data streams, and data stream 1 of 3G Level B. The

TRS_INS_DS2_MASK bit is in the IOPROC_2 register and is used to enable/disable TRS

insertion for 3G-B data streams only.

For 3G Level A signals, TRS insertion occurs in both Data Stream 1 and Data Stream 2.

For 3G Level B signals, TRS insertion occurs in both Data Stream 1 and Data Stream 2 of

both Link A and Link B.

Note: Inserted TRS code words are always 10-bit compliant, regardless of the bit depth

of the incoming video stream.

4.18.4 Line Based CRC Insertion

When CRC Insertion is enabled, the GS3470 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 bit is HIGH and the CRC_INS_DS[2:1]_MASK bit in

the ICPROC_[2:1] register is set LOW.

For 3G Level A signals, line based CRC word generation and insertion occurs in both

Data Stream 1 and Data Stream 2.

For 3G Level B signals, line based CRC word generation and insertion occurs in both Data

Stream 1 and Data Stream 2 of both Link A and Link B.

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