Alinx AX301 User Manual page 22

FPGA Development Board AX301 User Manual
Figure 10-1: VGA video signal transmission diagram
HSYNC and VSYNC are line data synchronization and frame data
synchronization, respectively, and are TTL levels. FPGA can only output digital
signals, and R, G, and B required by VGA are analog signals. The
digital-to-analog signals of VGA are implemented by a simple resistor circuit.
This resistor circuit can generate 32 gradient levels of red and blue signals and
64 gradient levels of green signals (RGB 5-6-5). The VGA interface circuit is
shown in Figure 10-2.
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