【正文】 L Englishes write BE:The Descriptiong Language of the VHSIC(the Speed Integrated of the Very High Circuit) into Chinese is soon extremely high the description language of the integrated circuit it of the application mainly is an application in the design of numerical electric , it is in the application most in China is the design which uses in the FPGA/CPLD/ in some units with stronger real strenght, it is also use to design ASIC. The VHDL mainly useds for the structure, behavior which describes numerical system, function with addition to implying many languages sentence which have a hardware characteristic, VHDL languages forms and description style and sentence construction are very similar at general calculator deluxe procedure structure characteristics is an engineering design, or call that the design entity(can be a ponent, an electric circuit mold piece or a system) is divided into exterior(or call but part, and port) with inner part(or call to can39。s in 20 centuries, calculator assistance manufacturing(CAM), calculator assistance test(CAT) and calculator lend support to the concept of engineering(CAE) a development since EDA technique is to take calculator as tool, design at EDA software terrace up, use the hardware description language HDL pletion a design a document, then is of oneself pleted logic to edit and translate, turn Chien, partitioned by the calculator, prehensive, excellent turn, set up, cloth line with imitate really, until for particular target chip of proper go together with to edit and translate, the logic reflect to shoot with plait distance download etc. EDA technical emergence, biggest raised efficiency and maneuverability of electric circuit design, eased to design of labor strength. These spare parts can pass a software plait a distance but as to it39。s nation, has been being actively investigating a new design method of the electronics electric circuit, and carried on an exhaustive change in the aspects of designing a method, tool wait, obtain huge the design realm of the electronics technique, the application of programmable logic spare part(like CPLD, FPGA), have already got extensive universality, these spare parts brought tremendous vivid for the design of numerical spare parts can pass a software plait a distance but as to it39。 EDA的發(fā)展及 VHDL的應用 9039。s in 20 centuries, international last electronics and calculator technique more the forerunner39。s hardware structure and work the way carry on heavy Gou and make thus the design of hardware can like software design so convenient all these biggest changed a traditional numerical method, design process of the system design and design idea and promoted the EDA technical quick development. The EDA is an electronics design automation(the Automation of the Electronic Design) of abbreviation, design(CAD) from the calculator assistance at the beginning of 9039。s hardware structure and work the way carry on heavy Gou and make thus the design of hardware can like