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GS1661 Datasheet(PDF) 62 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 62 Page - Semtech Corporation |
62 / 84 page ![]() GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 62 of 84 If the ANC_DATA_SWITCH bit is not toggled, extracted data is written into Bank B until full. To continue extraction in Bank A, the ANC_DATA_SWITCH bit must be toggled HIGH (see Figure 4-25: Ancillary Data Extraction - Step D). Figure 4-25: Ancillary Data Extraction - Step D Toggling the ANC_DATA_SWITCH bit LOW returns the process to step A (Figure 4-22). NOTE 1: Toggling the ANC_DATA_SWITCH must occur at a time when no extraction is taking place, i.e. when the both the Y/1ANC and C/2ANC signals are LOW. To turn extraction off, the ANC_DATA_EXT_MASK bit must be set HIGH. In HD mode, the device can detect ancillary data packets in the Luma video data only, Chroma video data only, or both. By default (at power-up or after a system reset), the device extracts ancillary data packets from the luma channel only. To extract packets from the Chroma channel only, the HD_ANC_C2 bit of the host interface must be set HIGH. To extract packets from both the Luma and Chroma video data, the HD_ANC_Y1_C2 bit must be set HIGH (the setting of the HD_ANC_C2 bit is ignored). The default setting of both the HD_ANC_C2 and HD_ANC_Y1_C2 is LOW. The setting of these bits is ignored when the device is configured for SD video standards. Ancillary data packet extraction and deletion is disabled when the IOPROC_EN/DIS pin is set LOW. After extraction, the ancillary data may be deleted from the video stream by setting the ANC_DATA_DEL bit of the host interface HIGH. When set HIGH, all existing ancillary data is removed and replaced with blanking values. If any of the ANC_TYPE registers are programmed with a DID and/or DID and SDID, only the ancillary data packets with the matching IDs are deleted from the video stream. 0 1023 Application Layer Read Pointer Internal Write Pointer Bank A ANC_DATA_SWITCH= HIGH 0 1023 Bank B ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA ANCDATA 800h 800h BFFh BFFh |
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