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ADV7180WBSTZ Datasheet(PDF) 72 Page - Analog Devices |
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ADV7180WBSTZ Datasheet(HTML) 72 Page - Analog Devices |
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72 / 120 page ![]() ADV7180 Data Sheet Rev. G | Page 72 of 120 Table 94. PAL CCAP Data, Half-Byte Mode Byte D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] Description 0 0 0 0 0 0 0 0 0 0 0 Fixed preamble 1 1 1 1 1 1 1 1 1 1 1 Fixed preamble 2 1 1 1 1 1 1 1 1 1 1 Fixed preamble 3 0 1 0 1 0 0 0 0 0 0 DID 4 EP EP EF 0 1 0 1 0 0 0 SDID 5 EP EP 0 0 0 0 0 1 0 0 Data count 6 EP EP 0 0 CCAP Word1[7:4] 0 0 User data-words 7 EP EP 0 0 CCAP Word1[3:0] 0 0 User data-words 8 EP EP 0 0 CCAP Word2[7:4] 0 0 User data-words 9 EP EP 0 0 CCAP Word2[3:0] 0 0 User data-words 10 CS[8] CS[8] CS[7] CS[6] CS[5] CS[4] CS[3] CS[2] CS[1] CS[0] Checksum Table 95. PAL CCAP Data, Full-Byte Mode Byte D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] Description 0 0 0 0 0 0 0 0 0 0 0 Fixed preamble 1 1 1 1 1 1 1 1 1 1 1 Fixed preamble 2 1 1 1 1 1 1 1 1 1 1 Fixed preamble 3 0 1 0 1 0 0 0 0 0 0 DID 4 EP EP EF 0 1 0 1 0 0 0 SDID 5 EP EP 0 0 0 0 0 1 0 0 Data count 6 CCAP Word1[7:0] 0 0 User data-words 7 CCAP Word2[7:0] 0 0 User data-words 8 1 0 0 0 0 0 0 0 0 0 UDW padding 0x200 9 1 0 0 0 0 0 0 0 0 0 UDW padding 0x200 10 CS[8] CS[8] CS[7] CS[6] CS[5] CS[4] CS[3] CS[2] CS[1] CS[0] Checksum NTSC CCAP Data Half-byte output mode is selected by setting GDECAD to 0, and the full-byte mode is enabled by setting GDECAD to 1. See the GDECAD, Gemstar Decode Ancillary Data Format, Address 0x4C[0] section. The data packet formats are shown in Table 92 and Table 93. Only closed caption data can be embedded in the output data stream. NTSC closed caption data is sliced on Line 21 of even and odd fields. The corresponding enable bit must be set high. See the GDECAD, Gemstar Decode Ancillary Data Format, Address 0x4C[0] section and the GDECOL[15:0], Gemstar Decoding Odd Lines, Address 0x4A[7:0], Address 0x4B[7:0] section. PAL CCAP Data Half-byte output mode is selected by setting GDECAD to 0, and full-byte output mode is selected by setting GDECAD to 1. See the GDECAD, Gemstar Decode Ancillary Data Format, Address 0x4C[0] section. Table 94 and Table 95 list the bytes of the data packet. Only closed caption data can be embedded in the output data stream. PAL closed caption data is sliced from Line 22 and Line 335. The corresponding enable bits must be set. See the GDECEL[15:0], Gemstar Decoding Even Lines, Address 0x48[7:0], Address 0x49[7:0] section and the GDECOL[15:0], Gemstar Decoding Odd Lines, Address 0x4A[7:0], Address 0x4B[7:0] section. GDECEL[15:0], Gemstar Decoding Even Lines, Address 0x48[7:0], Address 0x49[7:0] The 16 bits of GDECEL[15:0] are interpreted as a collection of 16 individual line decode enable signals. Each bit refers to a line of video in an even field. Setting the bit enables the decoder block trying to find Gemstar or closed caption-compatible data on that particular line. Setting the bit to 0 prevents the decoder from trying to retrieve data. See Table 96 and Table 97. To retrieve closed caption data services on NTSC (Line 284), GDECEL[11] must be set. To retrieve closed caption data services on PAL (Line 335), GDECEL[14] must be set. The default value of GDECEL[15:0] is 0x0000. This setting instructs the decoder not to attempt to decode Gemstar or CCAP data from any line in the even field. The user should only enable Gemstar slicing on lines where VBI data is expected. |
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