Avalon总线的pwm定制，在niosII下定制了PWM通过avalon总线链接到niosII上，绝非一般的实验，应用在实际的工控项目中。-Avalon bus pwm custom, under the custom of the PWM in the niosII by avalon bus link to niosII on the experiment in general not applied in real industrial control projects.