Alinx ZYNQ 7000 User Manual page 35

ZYNQ FPGA Development Board AX7020 User Manual
used as an HDMI display device (HDMI IN), the HDMI signal is used as an
input, and the HPD (hot plug detect) signal is used as an output. When the
development board is used as an HDMI master (HDMI OUT), the opposite is
true.
Figure 7-1: HDMI interface design schematic
When the development board is used as an HDMI main unit (HDMI OUT),
it needs to supply a +5V power supply to the HDMI display device. The power
output control circuit is shown in Figure 7-2.
Figure 7-2: HDMI 5V output circuit
The HMDI master device reads the EDID device information of the
HDMI display device through the IIC bus. The pin level of the FPGA is 3.3V,
but the level of HDMI is +5V, which requires the level conversion chip
GTL2002D to connect. The conversion circuit of IIC is shown in Figure 7-3.
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