參數(shù)資料
型號: TVP5031PFP
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號轉(zhuǎn)換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: POWER, PLASTIC, TQFP-80
文件頁數(shù): 70/92頁
文件大?。?/td> 415K
代理商: TVP5031PFP
2–56
2.11.46 TTX Control Register
Address
A0h
7
6
5
4
3
2
1
0
Reserved
Full-Field Enable
Custom Framing Code
CCD Enable
TTX Mode
Full field enable
0 = No TTX search after VBI area
1 = TTX search all lines after VBI
Custom sync
0 = Use default TTX sync pattern
1 = Use sync pattern register
CCD enable
0 = Closed caption is DISABLED
1 = Closed caption is ENABLED
TTX mode
0 = NABTS
1 = WST
The TTX control register allows the operating parameters of the TDR to be controlled. Note that the TTX mode
selection is independent of PAL/NTSC mode. This effectively controls the default framing code and data rate. Closed
caption is affected by 525 lines vs 625 lines (but not NABTS/WST). For NTSC and PAL M, the CCD data search is
on Line 21; for PAL B, G, I, combination-N it is on Line 22. The custom framing code affects teletext data only—closed
caption data always uses the default sync pattern.
2.11.47 Line Enable Registers A, B
Address
A1h – A2h
7
6
5
4
3
2
1
0
A1h – Line Enable Register A
Enable
line
17/280
(14/327)
Enable
line
16/279
(13/326)
Enable
line
15/278
(12/325)
Enable
line
14/277
(11/324)
Enable
line
13/276
(10/323)
Enable
line
12/275
(9/322)
Enable
line
11/274
(8/321)
Enable
line
10/273
(7/320)
7
6
5
4
3
2
1
0
A2h – Line Enable Register B
Enable
line
25/288
(22/335)
Enable
line
24/287
(21/334)
Enable
line
23/286
(20/333)
Enable
line
22/285
(19/332)
Enable
line
21/284
(18/331)
Enable
line
20/283
(17/330)
Enable
line
19/282
(16/329)
Enable
line
18/281
(15/328)
NOTE: Line numbers in parenthesis refer to 625 Line systems
Line enable XX
0 = No TTX search on line XX
1 = Search line XX for TTX data
In both VBI only and full field modes, the vertical interval lines can be individually enabled or disabled. Only lines that
are enabled are searched for the selected type of teletext data. This allows some amount of filtering on a physical
location basis. If closed caption data is enabled, this overrides the enable/disable bit for line 21 (22). If full field mode
is enabled, all lines after the vertical interval are searched for the selected type of the teletext data. The registers are
initialized to 0x00 on reset.
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