參數(shù)資料
型號： TDA938X
廠商： NXP Semiconductors N.V.
英文描述： TV signal processor-Teletext decoder with embedded m-Controller
中文描述： 電視信號處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù)： 47/140頁
文件大?。?/td> 570K
代理商： TDA938X
Philips Semiconductors
Preliminary specification
1999 Sep 28
47
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
VPS A
CQUISITION
When the TXT0. VPS ON bit is set, any VPS data present on line 16, field 0 of the CVBS signal at the input of
the teletext decoder is error checked and stored. The device automatically detects whether teletext or VPS is
being transmitted on this line and decodes the data appropriately
Figure 18 VPS Data Storage
Each VPS byte in the memory consists of 4 biphase decoded data bits (bits 0-3), a biphase error flag (bit 4) and
three 0s (bits5-7).
The TXT13. VPS Received bit is set by the hardware whenever VPS data is acquired. The flag can be reset by
writing a logic 0 into the SFR bit.
Full details of the VPS system can be found in Reference [5].
WSS A
CQUISITION
The Wide Screen Signalling data transmitted on line 23 gives information on the aspect ratio and display
position of the transmitted picture, the position of subtitles and on the camera/film mode. Some additional bits
are reserved for future use. A total of 14 data bits are transmitted.
All of the available data bits transmitted by the Wide Screen Signalling signal are captured and stored in SFR’s
WSS1, WSS2 and WSS3. The bits are stored as groups of related bits and an error flag is provided for each
group to indicate when a transmission error has been detected in one or more of the bits in the group.
Wide screen signalling data is only acquired when the TXT8.WSS ON bit is set.
The TXT8.WSS RECEIVED bit is set by the hardware whenever wide screen signalling data is acquired. The
flag can be reset by writing a logic 0 into the SFR bit.
C
LOSED
C
APTION
A
CQUISITION
The US Closed Caption data is transmitted on line 21 (525 line timings) and is used for Captioning information,
Text information and Extended Data Services. Full Details can be found in Reference [6].
Closed Caption data is only acquired when TXT21.CC ON bit is set
Two bytes of data are stored per field in SFR’s, the first bye is stored in CCDAT1 and the second byte is stored
in CCDAT2. The value in the CCDAT registers are reset to 00h at the start of the Closed Caption line defined
by CCLIN.CS<4:0>. At the end of the Closed Caption line an interrupt is generated if IE.ECC is active.
The processing of the Closed Caption data to convert into a displayable format is performed by the embedded
Software.
Teletext page
header data
VPS
byte 11
VPS
byte 12
VPS
byte 13
VPS
byte 14
VPS
byte 15
VPS
VPS
byte 5
9 10 11
12 13 14
15 16 17 18 19 20 21
22 23
column
row 25
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