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GS2970A Datasheet(PDF) 70 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 70 Page - Semtech Corporation |
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70 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 70 of 150 If both DID and SDID values are non-zero, then the received ancillary data type must match both the DID and SDID before Y/1ANC and/or C/2ANC is set HIGH. NOTE 1: For 3G Level B data, the ANC_TYPE_DS1 registers are valid for Data Stream 1, and a second set of five ANC_TYPE registers (ANC_TYPE_DS2) is provided for detection of specific ancillary data in Data Stream 2. NOTE 2: SMPTE 352M Payload Identifier packets and Error Detection and Handling (EDH) Packets are always detected by the GS2970A, irrespective of the settings of the ANC_TYPE registers. 4.17.2 SMPTE 352M Payload Identifier The GS2970A automatically extracts the SMPTE 352M payload identifier present in the input data stream for SD, HD, and 3G Level A signals. The four word payload identifier packets are written to VIDEO_FORMAT_X_DS1 and VIDEO_FORMAT_X_DS2 bits accessible through the host interface. The device also indicates the version of the payload packet in the VERSION_352M bit of the DATA_FORMAT_DSX register. When the SMPTE 352M packet is formatted as a “version 1” packet, the VERSION_352M bit is set HIGH, when the packet is formatted as a “version 2” packet, this bit is set LOW. The VIDEO_FORMAT_352_A_X and VIDEO_FORMAT_352_B_X registers are only updated if there are no checksum errors in the received SMPTE 352M packets. By default (at power up or after system reset), the VIDEO_FORMAT_X_DS1 and VIDEO_FORMAT_X_DS2 bits are set to 0, indicating an undefined format. NOTE 1: When 3G Level B data is detected by the device, the user needs to extract the SMPTE 352M Payload Identifier packets by using the ANC packet extraction block - they are not detected and extracted automatically. In this case: • The VD_STD_ERR bit is not valid • 352M extraction is only done on one data stream or the other, not both simultaneously (Link A or Link B selected via the host interface) • Previously embedded 352M packets can be deleted on one data stream only (using the ANC_DATA_DELETE bit, see Section 4.18.8), but these packets are replaced with 10-bit Y/C blanking values only • It is necessary to manually extract the SMPTE 352M data by programming the DID, SDID and line number information into the ANC data extraction block NOTE 2: SMPTE 352M packet regeneration is enabled by default for 3G Level B inputs, and should be disabled through the host interface if Level B to Level A conversion is not enabled. 4.17.2.1 SMPTE 352M Payload Identifier Usage The SMPTE 352M Payload Identifier is used to confirm the video format identified by the Automatic Video Standards Detection block (see Section 4.17.4). |
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