Testbench 不仅要产生激励也就是输入，还要验证响应也就是输出。当然也可以只产生 激励，然后通过波形窗口通过人工的方法去验证波形，这种方法只能适用于小规模的设计-The Testbench not only to generate incentives to input, verify that the response is output. Of course, can only produce Incentive, and then the waveform by the wa