Postscript: A page description language developed by, Adobe Systems Inc. of America. It is a computer programming language which tells a corresponding output device how to print the page.

The chapter 3 expatiate the EDA, the hardware description language, the programmable device and the suppliers including CPLD and FPGA.

By a case study, this paper shows that the language has a good ability of description interface and supports for multi-device environment, and it is so simple that one can learn and use easily.