Product Principle 4-11
4.4 Extension and Distribution
4.4.1 Video Extension Function
Video distribution plans of DC-70 V4.0 product are:
Primary display and secondary display both adopt DVI signals.
PC carrier board offers DDC channel. It communicates with primary display, secondary
display, VGA peripheral, HDMI peripheral.
The display parameters, such as the brightness of primary display and secondary display and the
contrast, are achieved on DDC channel.
The acquirement of peripheral resolution information is achieved on DDC channel.
The signal between primary display and secondary display is transmitted through the cables (lifting
column).The video signal of the peripheral is connected through board-to-board.
The schematic diagram of video distribution for the main unit is shown below:
PC Carrier
Board
Pri_DVI
Pri_DDC
Sec_DVI
Sec_DDC
HDMI
IO Board
VGA
Secondary Display
Primary Display
S-Video
DVR
VGA_DDC
HDMI_DDC
Figure 4-9 Main unit video distribution
The schematic diagram of video distribution for the PC carrier board is shown below:
CPU
TV Enc o de r
VGA E ncod er
DVI En co de r
DVI Dr iv e r
LV DS
User DDI1
User V GA
User S-Video
I2C Driver
I 2C
Video Driver
User V ideo
Blac k/whi te pr i nt er
I2C
User DDI2HDMI E ncod erI2C
Multi-func t ion FPGA
HDMI
User DDI3
Mai n di sp lay
Secondary
display
I2C
DVI
DVI
DDI3
Stand ard interfaces o n PC carrier
DDI1
DDI2
DP-TMDS
Translator
DVI
Reserved
Figure 4-10 PC carrier board video distribution
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