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GS1661 Datasheet(PDF) 55 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 55 Page - Semtech Corporation |
55 / 84 page ![]() GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 55 of 84 must program the DID and/or SDID of that ancillary data type. In the case where no DID or SDID values are programmed, the GS1661 indicates the presence of all ancillary data. In the case where one or more, DID and/or SDID values have been programmed, then only those matching data types are detected and indicated. The timing of the Y/1ANC and C/2ANC signals in this case is as shown in Figure 4-21. The GS1661 compares the received DID and/or SDID with the programmed values. If a match is found, ancillary data is indicated. For any DID or SDID value set to zero, no comparison or match is made. For example, if the DID is programmed and the SDID is not programmed, the GS1661 only detects a match to the DID value. 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: SMPTE 352M Payload Identifier packets and Error Detection and Handling (EDH) Packets are always detected by the GS1661, irrespective of the settings of the ANC_TYPE registers. 4.16.2 SMPTE 352M Payload Identifier The GS1661 automatically extracts the SMPTE 352M payload identifier present in the input data stream for SD and HD 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. 4.16.2.1 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 4.16.4) |
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