參數(shù)資料
型號(hào): ADV7180
廠商: Analog Devices, Inc.
英文描述: 10-Bit, 4 x Oversampling SDTV Video Decoder
中文描述: 10位,4個(gè)采樣標(biāo)清視頻解碼器
文件頁(yè)數(shù): 56/112頁(yè)
文件大小: 1320K
代理商: ADV7180
ADV7180
Data Bytes
The VBI_WORD_4 to VBI_WORD_N + 3 contains 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 78.
Rev. A | Page 56 of 112
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 74.
Table 73. Framing Code Sequence for Different VBI Standards
VBI Standard
TTXT_SYSTEM_A (PAL)
TTXT_SYSTEM_B (PAL)
TTXT_SYSTEM_B (NTSC)
TTXT_SYSTEM_C (PAL and NTSC)
TTXT_SYSTEM_D (PAL and NTSC)
VPS (PAL)
VITC (NTSC and PAL)
WSS (PAL)
GEMSTAR_1× (NTSC)
GEMSTAR_2× (NTSC)
CCAP (NTSC and PAL)
CGMS (NTSC)
Length in Bits
8
8
8
8
8
16
1
24
3
11
3
1
Error-Free Framing Code Bits
(In Order of Transmission)
11100111
11100100
11100100
11100111
11100101
10001010100011001
0
000111100011110000011111
001
1001_1011_101
001
0
Error-Free Framing Code Reported by VDP
(In Reverse Order of Transmission)
11100111
00100111
00100111
11100111
10100111
1001100101010001
0
111110000011110001111000
100
101_1101_1001
100
0
Table 74. Total User Data-Words for Different VBI Standards
1
VBI Standard
TTXT_SYSTEM_A (PAL)
ADF Mode
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
00 (nibble mode)
01,10 (byte mode)
Framing Code UDWs
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
VBI Data-Words
74
37
84
42
68
34
66
33
68
34
26
13
18
9
4
2
4
2
8
4
4
2
6
3 + 3
No. of Padding Words Total UDWs
0
0
2
3
2
3
0
2
2
3
0
0
0
0
2
3
2
3
2
1
2
3
0
2
84
44
96
52
80
44
76
42
80
44
36
20
28
16
16
12
16
12
20
12
16
12
16
12
TTXT_SYSTEM_B (PAL)
TTXT_SYSTEM_B (NTSC)
TTXT_SYSTEM_C (PAL and NTSC)
TTXT_SYSTEM_D (PAL and NTSC)
VPS (PAL)
VITC (NTSC and PAL)
WSS (PAL)
GEMSTAR_1× (NTSC)
GEMSTAR_2× (NTSC)
CCAP (NTSC and PAL)
CGMS (NTSC)
1
The first four UDWs are always the ID.
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