ViewSonic VS10848-1M Service Manual page 18

Video/Audio Signal Output Block Diagram
Firmware
The CRISC/TSP/VDEC/DPG/AUDIO blocks of the PWM2000 are operated by firmware (U30,U40). A
structure supporting firmware enables the PWM2000 to implement a flexible system configuration.
AV Input circuit (AV,S,YPbPr,PC,HDMI ):
AV Input source include AV1(S1),AV2(S2),HD1,HD2,PC,HDMI.
AV1 and AV2 Input
AV1 and AV2 include AV jack and S-video jack.
S jack has priority when S-jack and Video-jack plug in at the same time.
SDET-1 and SDET-2 =HI When S-jack plug in.
Composite video（AV1CVBS，AV2CVBS）and Y（AV1LUMA ，AV2LUMA）/C(AV1CHROMA,
AV2CHROMA) signal input Analog input port of U19 PW328.
AV1,AV2 Audio R/L Signals input U29 MSP4450G.
HD1 and HD2 Input
Component signal includes Y,Pb,Pr
HD1(Component Video signal AV3Y, AV3PB, AV3PR) and HD2(Component Video signal AV4Y,
AV4PB, AV4PR) signal input Analog input port of U19 PW328.
HD1 and HD2 Audio R/L Signals input U29 MSP4450G.
PC INPUT
PC(VGA)signal includes :R、G、B、HS、(Horizontal Sync Signal)、VS(Vertical Sync Signal)
When power on, PC will read the data of U19 via I2C then transfer R, G, B, HS and Vs signals into
analog input port of U19 PW328 via VGA Pin.
PC Audio R/L Signals input U29 MSP4450G.
HDMI INPUT
The HDMI cable and connectors carry four differential pairs that make up the TMDS data and clock
channels. These channels are used to carry video, audio and auxiliary data. In addition, HDMI carries
a VESA DDC channel. The DDC is used for configuration and status exchange between a single
Source and a single Sink(U13 SiI 9011 and U6 EDID PROM).
The U13 SiI 9011 video output goes to U19 PW328 digital input port(port 0).
The digital audio output by I2S bus (HDMI_CL, HDMI_WS, I2S_DI2) to the externally connected DA
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