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GS1661 Datasheet(PDF) 54 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 54 Page - Semtech Corporation |
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54 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 54 of 84 When operating in SD mode, the Y/1ANC and C/2ANC signals depend on the output data format. For 20-bit demultiplexed data, the Y/1ANC and C/2ANC signals operate independently to indicate the first and last ancillary Data Word position in the Luma and/or Chroma data streams. For 10-bit multiplexed data, the Y/1ANC signal is HIGH whenever ancillary data is detected, and the C/2ANC signal is always LOW. These status signal outputs are synchronous with PCLK and may be used as clock-enables for external logic, or as write-enables for an external FIFO or other memory devices. The operation of the Y/1ANC and C/2ANC signals is shown below in Figure 4-21. NOTE: When I/O processing is disabled, the Y/1ANC and C/2ANC flags may toggle, but they are invalid and should be ignored. Figure 4-21: Y/1ANC and C/2ANC Signal Timing 4.16.1 Programmable Ancillary Data Detection As described above in Section 4.16, the GS1661 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 5 different ancillary data types may be programmed for detection by the GS1661 in the ANC_TYPE_DS1 registers for SD and HD data. When so programmed, the GS1661 only indicates the presence of the specified ancillary data types, ignoring all other ancillary data. For each data type to be detected, the user PC L K LU M A D A T A O U T CHRO M A DA T A O U T Y/1A N C C/2A NC PC L K LU M A D A T A O U T Y/1A N C PC L K CHRO M A DA T A O U T A N C DA T A DE T E CT IO N - H DT V 1 0 B IT OUT P U T M O DE PC L K M U LT IP LE X E D Y 'Cb Cr YC S U M CCS U M Y DID CA NC 3F F 00 0 000 F F 3 F F 3 F F 3 A N C DA T A DE T E CT IO N - H DT V 2 0 B IT O U T P UT M O DE BL ANK BL AN K AN C D A T A DC DB N DID CS UM AN C D A T A CS UM AN C D A T A DC DB N DID AN C D A T A 3F F 3FF 3F F 3FF 00 0 00 0 A N C DA T A DE T E CT IO N - S DT V 2 0 B IT O U T P UT M O DE CS UM BL AN K AN C D A T A AN C D A T A DC DID AN C D A T A BL A N K BL AN K AN C D A T A AN C D A T A AN C D A T A DB N AN C D A T A 3FF BL AN K 00 0 3FF A N C DA T A DE T E CT IO N - S D T V 1 0 B IT O U T P UT M O DE CS UM BL AN K AN C D A T A DC DB N DID AN C D A T A 3F F 3F F 000 M U LT IP LE X E D Y 'Cb Cr Y/1A N C Y/1A N C C/2A NC C/2A NC |
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