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YpbPr (analog signal)is converted the signal into A/D by MST9885，it is 24bit digital tricolor
signal；second various video signals（include TV signal） are disposalled by VPC3230 ，then
output the signal format ITU-R656 YUV signal；The third part decode DVI1.0 standard digital
signal then output 24bitRGB signal。
3.1.1 .4 VGA/YpbPr analog signal disposal：
R, G, B signal From the VGA 1, 2, 3 pin through the static electricity protection
circuit switches with
signal(PC source) pass C81、C82、C84 to 54、48、43 pin of MST9885 and A/D converter in it。
Moreover ,
Vertical , Horizontal
synchronous pulse orthopedics circuit after static electricity protect processing.
sync after face lifting in 74LCX32 sends to the PI5V330 to the switch , and
Horizontal
then feedback to the 30 pins of MST9885, By the effect of
MST9885 creates PLL lock providing the MST9885 work clock.
buffer and enlarge in U71 outputs from the 6 pin of U71, and choices in U9(74
LVC126s).In VGA mode ,the signal to the 31 pin of MST9885, provides a
sync to the MST9885.
The PDP display is the exterior equipments, and need an identify signal to
examined by host when host communication. The 24LC21s of U8( EEPROM) saves
the hardware concerning display parameter.( install etc. such as the factory, model
number, resolution)
MST9885 under the control of PW113 bus, converts the R,G,B input 8 bit digital R,G,B
signal. 67 pin outputs pixel clock signal DATACK。
and PW1235s at the same time, disposals the format judged by PW113.
3.1.1.4 Analog video signal disposal：
9 pin of N901 outputs video signal passes VN901 and goes to 1 pin of TEA6425D，at the
same time 1 channel AV video signal sends to the 8 pin of TEA6425D，and other channel S-video
signal (Y、C signal) sends to 6、5 pin of TEA6425D respectively. The three signals switches in
the TEA6425D. VIDEO or Y signal outputs toVPC3230D from 17pin，C signal outputs from
18pin，at the same time 19 pin video outputs from19 pin。VPC3230 The signal from TEA6425
after switch and A/D，send to chroma decode circuit ,which can identify PAL/NTSC/SECAM
signal automatically ，and to each decode after identify. Such as NTSC video after identify ，the
system switches the TEA6425D channel ，sends to NTSC 3D comb filter from 14 pin of
TEA6425D. After digital 3D comb filter in uPD64083， YC signal sends back to 73、71pin of
VPC3230D， to AD convertor and saturation control etc. The output digital YUV signal， switches
with digital YUV signal after A/D which inputs from 4、5、6pin，and outputs digital YUV
signal sends to video disposal， include zoom、 contrast、 panorama mode、 brightness、 gain control
video signal from YpbPr input port in PI5V330. After then R、G、B
sync from the VGA 13,14 pin also send to the
The above signal sends to the PW113
28
sync ,
Horizontal
sync after
Vertical
Vertical
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