ADV7182 Datasheet, PDF (54/96 Pages) Analog Devices – 10-Bit, SDTV Video Decoder with Differential Inputs

ADV7182
Data Sheet
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 88.
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 84.
Table 83. Framing Code Sequence for Different VBI Standards
VBI Standard
Length in Bits
Error-Free Framing Code Bits
(in Order of Transmission)
TTXT_SYSTEM_A (PAL)
8
11100111
TTXT_SYSTEM_B (PAL)
8
11100100
TTXT_SYSTEM_B (NTSC)
8
11100100
TTXT_SYSTEM_C (PAL and NTSC) 8
11100111
TTXT_SYSTEM_D (PAL and NTSC) 8
11100101
WSS (PAL)
24
000111100011110000011111
CCAP (NTSC and PAL)
3
001
CGMS (NTSC)
1
0
Error-Free Framing Code Reported by
VDP (in Reverse Order of Transmission)
11100111
00100111
00100111
11100111
10100111
111110000011110001111000
100
0
Table 84. Total User Data-Words for Different VBI Standards¹
VBI Standard
ADF Mode
Framing Code UDWs
TTXT_SYSTEM_A (PAL)
00 (nibble mode) 6
01, 10 (byte mode) 3
TTXT_SYSTEM_B (PAL)
00 (nibble mode) 6
01, 10 (byte mode) 3
TTXT_SYSTEM_B (NTSC)
00 (nibble mode) 6
01, 10 (byte mode) 3
TTXT_SYSTEM_C (PAL and NTSC) 00 (nibble mode) 6
01, 10 (byte mode) 3
TTXT_SYSTEM_D (PAL and NTSC) 00 (nibble mode) 6
01, 10 (byte mode) 3
WSS (PAL)
00 (nibble mode) 6
01, 10 (byte mode) 3
CCAP (NTSC and PAL)
00 (nibble mode) 6
01, 10 (byte mode) 3
CGMS (NTSC)
00 (nibble mode) 6
01, 10 (byte mode) 3
VBI Data-Words
74
37
84
42
68
34
66
33
68
34
4
2
4
2
6
3+3
No. of Padding Words
0
0
2
3
2
3
0
2
2
3
2
3
2
3
0
2
Total UDWs
84
44
96
52
80
44
76
42
80
44
16
12
16
12
16
12
1 _{The first four UDWs are always the ID.}
Rev. A | Page 54 of 96