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GS1661 Datasheet(PDF) 60 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 60 Page - Semtech Corporation |
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60 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 60 of 84 ancillary data to be extracted can be programmed in the ANC_TYPE registers (see Section 4.16.1). Additionally, the lines from which the packets are to be extracted can be programmed into the ANC_LINEA[10:0] and ANC_LINEB[10:0] registers, allowing ancillary data from a maximum of two lines per frame to be extracted. If only one line number register is programmed (with the other set to zero), ancillary data packets are extracted from one line per frame only. When both registers are set to zero, the device extracts packets from all lines. To start Ancillary Data Extraction, the ANC_DATA_EXT_MASK bit of the host interface must be set LOW. Ancillary data packet extraction begins in the following frame (see Figure 4-22: Ancillary Data Extraction - Step A). Figure 4-22: Ancillary Data Extraction - Step A Ancillary data is written into Bank A until full. The Y/1ANC and C/2ANC output flags can be used to determine the length of the ancillary data extracted and when to begin reading the extracted data from memory. While the ANC_DATA_EXT_MASK bit is set LOW, the ANC_DATA_SWITCH bit can be set HIGH during or after reading the extracted data. New data is then written into Bank B (up to 1024 x 16-bit words), at the corresponding host interface addresses (see Figure 4-23: Ancillary Data Extraction - Step B). ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA 0 1023 Application Layer Read Pointer Internal Write Pointer Bank A ANC_DATA_SWITCH=LOW 0 1023 Bank B 800h 800h BFFh BFFh |
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