Alinx Cyclone IV FPGA User Manual page 49

Cyclone IV FPGA Development Board AX515 User Manual
including four user buttons (KEY1~KEY4) and one reset button RESET. The
buttons are active low, and the schematic diagram of the four user buttons is
shown in Figure 19-1
Figure 19-1: Four User Button Schematic
The reset button is connected to the normal IO of FPGA for reset FPGA
program.
Figure 19-2: Reset Button Schematic
Figure 19-3: Five independent buttons on the FPGA board
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