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The CPU board is an essential CPU system containing the CPU, FLASH, memory, realtime
clock, EEPROM, etc. It interfaces to the mother board only, which then provides interfaces to
all other external devices.
The mother board is in charge of connections and communications with other components
and provides the following interfaces:
LCD port: connects a built-in display.
Video output+network+IO+IIC: connects the digital video interface board.
USB×2+UART: connects the USB interface board.
Button board port: connects the button board.
Integral module rack port: connects integral module rack communication board.
Fan port: connects the fan.