该程序使用Verolog HDL 语言编写，是一个使用DDS原理产生方波的程序，该程序还提供三个按键来改变频率。-This program is developed by Verilog HDL, and is used to generate a squre waveform of any frequancy. This program provide three buttons to change the frequency.

利用DDS技术产生100~1MHz的方波 利用DDS技术产生100~1MHz的方波-generate 100Hz ~ 1MHz square with DDS,using verilog HDL generate 100~1MHz square with DDS,using verilog HDL generate 100~1MHz square with DDS,using verilog HDL