The integrated circuit design has been becoming more and more sophisticated and using hardware description language to design complex integrated circuit has also been a tendency. Considering from the development of EDA technology, using the C language to design CPLD / FPGA will be the progress direction. 集成电路设计越来越复杂,使用硬件描述语言设计复杂集成电路成为一种趋势,从EDA技术的发展趋势上看,直接采用C语言设计CPLD/FPGA将是一个发展方向。