參數(shù)資料
型號： BT865AKPF
英文描述： Color Encoder Circuit
中文描述： 顏色編碼器電路
文件頁數(shù)： 39/76頁
文件大?。?/td> 1050K
代理商： BT865AKPF
Bt864A/865A
1.0 Circuit Description
YCrCb to NTSC/PAL Digital Video Encoder
1.10 Wide Screen Signaling (WSS)/Copy Generation Management System
100138B
Conexant
1-29
1.9.4 Teletext Clock Output
The Bt864A/865A can output the teletext clock from the TTXREQ pin by setting
TXRM = 1. In this mode, this teletext clock would only be output on active
teletext lines and each line would have exactly 360 clocks to be used to
synchronize the teletext data to the Bt864A/865A. The rising edge of clock could
be used to latch the data on the output of the device providing the teletext data.
The falling of the clock indicates that the Bt864A/865A has received the teletext
data.
1.10 Wide Screen Signaling (WSS)/Copy
Generation Management System (CGMS)
Encoding
The Bt864A/865A encodes the WSS/CGMS into the appropriate video line
according to EIAJ CPX-1204. The interface consists of 3 8-bit I
2
C registers into
which is written the individual enables for lines 20 and 283 (EWSF1 and EWSF2)
and the 20 bits of data (WSDAT [1:20]). These I
2
C registers are double-buffered
and can be written without corrupting any data actively being encoded on line 20
or 283. When updating any of the WSS/CGMS registers, all 3 8-bit I
2
C registers
should be written at the same time; the internal data transfer occurs after the last
WSS/CGMS register is written. WSS/CGMS encoding will override active video
if enabled by EVBI.
Figure 1-21. Typical WSS/CGMS Waveform
20 bits
70 IRE nom
Word0
Word1
Word2
CRCC
b
b
2.235 μs
11.2 μs
0 IRE nom
49.1 μs
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BT865AKRF 制造商:CONEXANT 制造商全稱:CONEXANT 功能描述:YCrCb to NTSC/PAL Digital Video Encoder
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BT867KPF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
BT867KPJ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit
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