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GS1661A Datasheet(PDF) 56 Page - Semtech Corporation |
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GS1661A Datasheet(HTML) 56 Page - Semtech Corporation |
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56 / 85 page  GS1661A HD/SD SDI Receiver Data Sheet 54387 - 2 September 2012 56 of 85 4.16.1 Programmable Ancillary Data Detection As described above in Section 4.16, the GS1661A detects and indicates all ancillary data types by default. It is possible to program which ancillary data types are to be detected and indicated. Up to five different ancillary data types may be programmed for detection by the GS1661A in the ANC_TYPE_DS1 registers for SD and HD data. When so programmed, the GS1661A only indicates the presence of the specified ancillary data types, ignoring all other ancillary data. For each data type to be detected, the user must program the DID and/or SDID of that ancillary data type. In the case where no DID or SDID values are programmed, the GS1661A 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 4-22. The GS1661A 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 GS1661A 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 GS1661A, irrespective of the settings of the ANC_TYPE registers. 4.16.2 SMPTE 352M Payload Identifier The GS1661A 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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