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GS1661 Datasheet(PDF) 58 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 58 Page - Semtech Corporation |
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58 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 58 of 84 4.17.1 TRS Correction & Insertion When TRS Error Correction and Insertion is enabled, the GS1661 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. 4.17.2 Line Based CRC Correction & Insertion When CRC Error Correction and Insertion is enabled, the GS1661 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 mode, 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. 4.17.3 Line Number Error Correction & Insertion When Line Number Error Correction and Insertion is enabled, the GS1661 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 video standard as determined by the Automatic Standards Detection block. This feature is enabled when the device is operating in HD mode, the IOPROC_EN/DIS pin is HIGH and the LNUM_INS_DSX_MASK bit in the IOPROC_X register is set LOW. 4.17.4 ANC Data Checksum Error Correction & Insertion When ANC data Checksum Error Correction and Insertion is enabled, the GS1661 generates and inserts ancillary data checksums for all ancillary data words by default. Where user specified ancillary data has been programmed (see Section 4.16.1), 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. 4.17.5 EDH CRC Correction & Insertion When EDH CRC Error Correction and Insertion is enabled, the GS1661 generates and overwrites full field and active picture CRC check-words. Additionally, the device sets the active picture and full field CRC 'V' bits HIGH in the EDH packet. The AP_CRC_V and FF_CRC_V register bits only report the received EDH validity flags. |
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