最后是软件部分的编程，包括CPLD部分的硬件描述语言程序设计，和DSP部分相关的程序设计。
At last we describe the software design, including software design of CPLD basing on VHDL and software design of DSP.
试验程序由VHDL硬件描述语言编写。
The program is compiled with VHDL(hardware description language).
这是一个用硬件描述语言来设计的交通灯程序，和实用，很经济。
This is a hardware description language used to design the traffic light procedures, and practical, it is economic.
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