说明：  本文主要讨论了Verilog语言的基于DDS的波形发生器的设计。从设计要求入手，本文给出了DDS的详细设计过程，包括各个模块的设计思想，电路图，Verilog语言程序代码。其大致思想为通过频率控制字和相位控制字去控制正弦函数的ROM存储表的地址并对应着得到其幅度值，最终达到输出需要波形的目的。
(This paper mainly discusses the design of the Verilog language, the DDS-based waveform generator. Starting from the design requirements, this paper presents the detailed design of the DDS process, including the various modules of the design ideas, schematics, Verilog language code. The general idea of frequency control word and phase control word to control the address of the ROM memory table of the sine function and the corresponding get its amplitude value, and ultimately achieve the purpose of waveform output needs.)