The features and application of VHDL were introduced. With examples of the design of automat as well as its codes and simulation waveform, the performing process was illustrated in detail.

• 摘要介绍了VHDL的特点和应用；以自动售货机的设计为例，详细说明了其实现过程，并给出了实现代码和时序仿真波形。