Vga Port - Alinx AX301 User Manual

AX301 User Manual
At the same time, two LED indicators (LED7, LED8) are set for the serial port signal.
LED7 and LED8 will indicate whether the serial port has data to send or if there is data
accepted, as shown in Figure 9-2.
Figure 9-2
UART pin assignment:
Signal Name Pin
RXD M2
TXD N1

10. VGA Port

The VGA interface is a type D interface with a total of 15 pinholes, divided into three rows,
five in each row. Three RGB color component signals and two scanning synchronization
signals HSYNC and VSYNC pins.
The pins 1, 2, and 3 are three-color analog voltages of red, green, and blue, which are
0~0.714V peak-peak, 0V represents colorless, and 0.714V represents full color. Some
non-standard monitors use a 1Vpp full-color level.
The source impedance and termination resistance of the three primary colors are all 75
ohms. As shown in Figure 10-1
Figure 10-1
HSYNC and VSYNC are line data synchronization and frame data synchronization,
respectively, TTL level. The FPGA can only output digital signals, whereas the R, G, and B
required by the VGA are analog signals, and the digital to analog signals of the VGA are
implemented through a simple resistor circuit. This resistor circuit can generate 32
gradient-level red and blue signals and 64 gradient-level green signals (RGB 5-6-5). The
VGA interface circuit is shown in Figure 10-2.
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