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GS2970A Datasheet(PDF) 69 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 69 Page - Semtech Corporation |
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69 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 69 of 150 Figure 4-30:Y/1ANC and C/2ANC Signal Timing 4.17.1 Programmable Ancillary Data Detection As described above in Section 4.17, the GS2970A 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 GS2970A in the ANC_TYPE_DS1 registers for SD, HD and 3G Level A data. When so programmed, the GS2970A 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 GS2970A 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 4-30. The GS2970A 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 GS2970A only detects a match to the DID value. 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 N C 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 NC 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 UM 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 A NC DA T A DC DB N DID CS UM A NC DA T A CS UM A NC DA T A DC DB N DID A NC DA T A 3F F 3FF 3F F 3FF 00 0 00 0 A NC 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 A NC DA T A A NC DA T A DC DID A NC DA T A BL A N K BL AN K A NC DA T A A NC DA T A AN C D A T A DB N A NC DA 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 A NC DA T A DC DB N DID A NC DA 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 N C C/2A N C |
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