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ADV7180BSTZ Datasheet(PDF) 59 Page - Analog Devices |
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ADV7180BSTZ Datasheet(HTML) 59 Page - Analog Devices |
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59 / 120 page  Data Sheet ADV7180 Rev. G | Page 59 of 120 Data Bytes VBI_WORD_4 to VBI_WORD_N + 3 contain the data-words that were decoded by the VDP in the transmission order. The position of bits in bytes is in the inverse transmission order. For example, closed captioning has two user data bytes, as shown in Table 82. The data bytes in the ancillary data stream are as follows: VBI_WORD_4 = Byte 1[7:0] VBI_WORD_5 = Byte 2[7:0] The number of VBI_WORDS for each VBI data standard and the total number of UDWs in the ancillary data stream is shown in Table 78. Table 77. Framing Code Sequence for Different VBI Standards VBI Standard Length in Bits Error-Free Framing Code Bits (in Order of Transmission) Error-Free Framing Code Reported by VDP (in Reverse Order of Transmission) TTXT_SYSTEM_A (PAL) 8 11100111 11100111 TTXT_SYSTEM_B (PAL) 8 11100100 00100111 TTXT_SYSTEM_B (NTSC) 8 11100100 00100111 TTXT_SYSTEM_C (PAL and NTSC) 8 11100111 11100111 TTXT_SYSTEM_D (PAL and NTSC) 8 11100101 10100111 VPS (PAL) 16 10001010100011001 1001100101010001 VITC (NTSC and PAL) 1 0 0 WSS (PAL) 24 000111100011110000011111 111110000011110001111000 GEMSTAR_1× (NTSC) 3 001 100 GEMSTAR_2× (NTSC) 11 1001_1011_101 101_1101_1001 CCAP (NTSC and PAL) 3 001 100 CGMS (NTSC) 1 0 0 Table 78. Total User Data-Words for Different VBI Standards1 VBI Standard ADF Mode Framing Code UDWs VBI Data-Words No. of Padding Words Total UDWs TTXT_SYSTEM_A (PAL) 00 (nibble mode) 6 74 0 84 01, 10 (byte mode) 3 37 0 44 TTXT_SYSTEM_B (PAL) 00 (nibble mode) 6 84 2 96 01, 10 (byte mode) 3 42 3 52 TTXT_SYSTEM_B (NTSC) 00 (nibble mode) 6 68 2 80 01, 10 (byte mode) 3 34 3 44 TTXT_SYSTEM_C (PAL and NTSC) 00 (nibble mode) 6 66 0 76 01, 10 (byte mode) 3 33 2 42 TTXT_SYSTEM_D (PAL and NTSC) 00 (nibble mode) 6 68 2 80 01, 10 (byte mode) 3 34 3 44 VPS (PAL) 00 (nibble mode) 6 26 0 36 01, 10 (byte mode) 3 13 0 20 VITC (NTSC and PAL) 00 (nibble mode) 6 18 0 28 01, 10 (byte mode) 3 9 0 16 WSS (PAL) 00 (nibble mode) 6 4 2 16 01, 10 (byte mode) 3 2 3 12 GEMSTAR_1× (NTSC) 00 (nibble mode) 6 4 2 16 01, 10 (byte mode) 3 2 3 12 GEMSTAR_2× (NTSC) 00 (nibble mode) 6 8 2 20 01, 10 (byte mode) 3 4 1 12 CCAP (NTSC and PAL) 00 (nibble mode) 6 4 2 16 01, 10 (byte mode) 3 2 3 12 CGMS (NTSC) 00 (nibble mode) 6 6 0 16 01, 10 (byte mode) 3 3 + 3 2 12 1 The first four UDWs are always the ID. |
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