參數(shù)資料
型號(hào)： TVP5020TQFP
廠商： Texas Instruments, Inc.
英文描述： NTSC/PAL VIDEO DECODER
中文描述： NTSC / PAL視頻解碼器
文件頁(yè)數(shù)： 72/87頁(yè)
文件大小： 387K
代理商： TVP5020TQFP
2–58
2.15.32 TTX Control Register
VIP address
1A0
VMI address
I2C address
A0
A0
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Full-field enable
Custom framing
code
CCD enable
TTX mode
Teletext mode
CCD enable
Custom sync
Full field enable
0 = NABTS
0 = Closed caption is disabled
0 = Use default teletext sync pattern
0 = No teletext search after VBI area
1 = WST
1 = Closed caption is enabled
1 = Use sync pattern register
1 = Teletext search all lines after VBI
The TTX control register allows operating parameters of the VBI data processor to be controlled. The TTX
mode selection is independent of PAL/NTSC mode, which is selected by the TVP5020. This effectively
controls the default framing code and data rate. Closed caption data is affected by 525 lines versus 625 lines
(but not NABTS/WST). For NTSC and PAL M, the CCD data search is on Line 21; for PAL B,G,H,I,N it is
on Line 22. Custom framing code affects teletext data ONLY – closed caption data always uses the default
sync pattern.
2.15.33 Line Enable Registers
VIP address
1A1
VMI address
I2C address
A1
A1
7
6
5
4
3
2
1
0
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)
VIP address
1A2
VMI address
I2C address
A2
A2
7
6
5
4
3
2
1
0
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)
Line enable XX
NOTE: Line numbers in parentheses refer to 625 Line systems
0 = No teletext search on line XX
1 = Search line XX for teletext 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
teletext data. The registers are initalized to 0x00 on reset.
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