In recent years , the technology of integrate circuit ( ic ) has been developed greatly . methods and tools of the design in integrate circuit ( ic ) have also been developed rapidly . after computer aided design ( cad ) and electronic design automatic ( eda ) were invented , they are used in all of steps of integrate circuit ( ic ) design . and these tools give devisers much help and enhance the efficiency of the design . but the size of integrate circuit ( ic ) chip was enlarged greately and the structure of integrate circuit ( ic ) chip became more and more complex 随着集成电路和微电子技术的发展,集成电路设计的设计手段和设计工具也取得了很大发展,特别是计算机辅助设计( cad )和电子设计自动化( eda )工具。它们应用于集成电路设计的各个环节,这给设计人员带了很大的帮助,极大的提高了设计效率。但是,集成电路芯片的规模日益增大,结构越来越复杂,计算机辅助设计和电子设计自动化软件工具也显得越来越力不从心。
