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GS2970A Datasheet(PDF) 79 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 79 Page - Semtech Corporation |
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79 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 79 of 150 Figure 4-34:Ancillary Data Extraction - Step D Toggling the ANC_DATA_SWITCH bit LOW returns the process to step A (Figure 4-31). 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. In 3G mode Level A, the device can detect ancillary data packets in Luma video (Data Stream One) only, Chroma video (Data Stream Two) only, or both. By default (at power-up or after a system reset) the device extracts ancillary data packets from Data Stream One only. In 3G mode Level B mode, the device can detect ancillary data packets in Luma video only, Chroma video only, or both from either Link A or Link B. Selection of Link A or Link B for ANC data extraction is done via the host interface. By default (at power-up or after a system reset) the device extracts ancillary data packets from Link A Luma only. To extract packets from the Chroma/Data Stream Two channel only, the HD_ANC_C2 bit of the host interface must be set HIGH. To extract packets from both Luma/Data Stream One and Chroma/Data Stream Two 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. 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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