一种简单的PWM　VHDL实现方法，脉宽可调，周期可调，可作二维流水灯控制练习使用-A simple PWM VHDL, pulse width adjustable cycle adjustable, can be used for two-dimensional water light control practice using

实现pwm波的输出，按键可调占空比的，可通过连接pwm输出值led灯以检测占空比的变化,To realize the output of the PWM wave, key adjustable duty ratio, but through the connection PWM output value led lamp with testing duty ratio changes