參數(shù)資料
型號(hào): ADV7188
廠商: Analog Devices, Inc.
英文描述: Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述: 標(biāo)清多格式視頻解碼器支持快速開(kāi)關(guān)重疊
文件頁(yè)數(shù): 68/112頁(yè)
文件大?。?/td> 943K
代理商: ADV7188
ADV7188
Table 90. NTSC Line Enable Bits and Corresponding Line
Numbering
Line Number
(ITU-R BT.470)
0
10
1
11
2
12
3
13
4
14
5
15
6
16
7
17
8
18
9
19
10
20
11
21
Rev. 0 | Page 68 of 112
Line[3:0]
Enable Bit
GDECOL[0]
GDECOL[1]
GDECOL[2]
GDECOL[3]
GDECOL[4]
GDECOL[5]
GDECOL[6]
GDECOL[7]
GDECOL[8]
GDECOL[9]
GDECOL[10]
GDECOL[11]
Comment
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar or
closed caption
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar
Gemstar or
closed caption
Gemstar
Gemstar
Gemstar
Gemstar
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
22
23
24
25
273 (10)
274 (11)
275 (12)
276 (13)
277 (14)
278 (15)
279 (16)
280 (17)
281 (18)
282 (19)
283 (20)
284 (21)
GDECOL[12]
GDECOL[13]
GDECOL[14]
GDECOL[15]
GDECEL[0]
GDECEL[1]
GDECEL[2]
GDECEL[3]
GDECEL[4]
GDECEL[5]
GDECEL[6]
GDECEL[7]
GDECEL[8]
GDECEL[9]
GDECEL[10]
GDECEL[11]
12
13
14
15
285 (22)
286 (23)
287 (24)
288 (25)
GDECEL[12]
GDECEL[13]
GDECEL[14]
GDECEL[15]
GDECOL[15:0] Gemstar Decoding Odd Lines, Address 0x4A
[7:0]; Address 0x4B [7:0]
The 16 bits of the GDECOL[15:0] form a collection of 16
individual line decode enable signals. See Table 90 and Table 91.
To retrieve closed caption data services on NTSC (Line 21),
GDECOL[11] must be set.
To retrieve closed caption data services on PAL (Line 22),
GDECOL[14] must be set.
The default value of GDEC0L[15:0] is 0x0000. This setting
instructs the decoder not to attempt to decode Gemstar or
CCAP data from any line in the odd field. The user should only
enable Gemstar slicing on lines where VBI data is expected.
GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C [0]
The decoded data from Gemstar-compatible transmissions or
closed caption transmission is inserted into the horizontal
blanking period of the respective line of video. A potential
problem can arise if the retrieved data bytes have the value 0x00
or 0xFF. In an ITU-R BT.656-compatible data stream, those
values are reserved and used only to form a fixed preamble.
The GDECAD bit allows the data to be inserted into the
horizontal blanking period in two ways:
Insert all data straight into the data stream, even the reserved
values of 0x00 and 0xFF, if they occur. This may violate the
output data format specification ITU-R BT.1364.
Split all data into nibbles and insert the half-bytes over
double the number of cycles in a 4-bit format.
0 (default)—The data is split into half-bytes and inserted.
1—The data is output straight in 8-bit format.
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