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GS2970A Datasheet(PDF) 80 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 80 Page - Semtech Corporation |
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80 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 80 of 150 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. NOTE 2: After the ancillary data determined by the ANC_TYPE_X_APX registers has been deleted, other existing ancillary data may not be contiguous. The device does not concatenate the remaining ancillary data. NOTE 3: Reading extracted ancillary data from the host interface must be performed while there is a valid video signal present at the serial input and the device is locked (LOCKED signal is HIGH). 4.18.9 Level B to Level A Conversion When IOPROC_2 register bit LEVEL_B2A_CONV_DISABLE_MASK is HIGH (default), the GS2970A does not convert 3G LEVEL B streams between Level A and Level B mapping formats. When LEVEL_B2A_CONV_DISABLE_MASK is LOW, the GS2970A converts a 3G 1080p Level B stream to the Level A mapping format, as per SMPTE 425M. The device assumes that Link A and Link B are phase-aligned at the transmitter. The output data are line multiplexed such that the data content from Link A and Link B are assembled in a continuous fashion, at twice the input data rate. Extracted timing reference information is used to trigger a line counter which embeds the correct line number according to SMPTE 425M. The Level B/A conversion acts only on the active picture, ANC data can become corrupt outside of this region. In order to ensure that the embedded ANC data remains valid, we recommend extracting the ANC data with the receiver prior to the Level B/A conversion taking place. NOTE 1: If Level B/A conversion is enabled, previous 352M Payload ID packets are not deleted from the data stream. NOTE 2: When Level B/A conversion is enabled, timing reference information (FVH) present on the STAT outputs is not phase-aligned with the output video data, and should not be used for line or frame synchronization activities. Being that CEA 861 timing is derived from (FVH) timing reference information, it too should not be used. During Level B to Level A conversion, it is advised that the user generates the H and V timing signals from the embedded TRS words. NOTE 3: If the GS2970A sees a synchronous switch where the difference in phases between two Level B inputs is greater than ~10.7 μs, the user may observe a missing H pulse on the line following the switch line, when Level B/A conversion is enabled. NOTE 4: Discontinuities in the line of video at the input of the Level B to A converter can cause erroneous mapping to the Level A format. Therefore, when enabling B to A conversion or enabling/disabling audio, it is recommended to reset the Level B to A converter with the following sequence: |
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