一款基于FPGA的数码显示译码器的小程序，定义动态扫描时钟信号，定义四位输入信号，检测时钟上升沿，计数器dount累加。-An FPGA-based digital display decoder small program, define dynamic scan clock signal, the definition of four input signals, detects the rising edge of the clock, the counter dount accumula