基于FPGA的可键盘控制计数电路的设计与实现

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介绍一种基于FPGA（Field Programmable GateArray）现场可编程门阵列的可键盘控制的计数．显示电路的实现方法。应用VHDL语言（高速集成电路硬件描述语言）完成了3x4矩阵开关的扫描电路．可预置数的BCD码计数电路及4位数码管动态扫描电路的描述。通过原理图输入方式完成了系统功能的设计。电路结构简单，便于扩展，可靠性高，且可移植性强，容易实现。该电路已成功应用于测试某脉冲电容质量试验的控制电路中。

This text introduced a method of realizing count and display circuit which was controlled with keyboard based on FPGA. It completed some circuital description by using VHDL language, such as the scanning circuit for a 3×4 matrix keyboard, the presetable BCD code count circuit and the dynamic scan display circuit for 4-bit digitons. In the meantime, this paper completed the system function design with the schematic diagram mode. The circuit structure is simple, and is advantageous for the expansion. Furthermore, it has the good transplant, and it is easy to realize. This circuit has been successfully used in a control circuit to test pulse capacitor quality.