1、附录 A 英文 文献 The development of EDA and the application of VHDL 90s in 20 centuries, international last electronics and calculator technique more the forerunners nation, has been being actively investigating a new design method of the electronics electric circuit, and carried on an exhaustive change i
2、n the aspects of designing a method, tool wait, obtain huge success.At 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 sys
3、tem.These spare parts can pass a software plait a distance but as to its hardware structure and work the way carry on heavy Gou and make thus the design of hardware can like software design so convenient fast.The all these biggest changed a traditional numerical method, design process of the system
4、design and design idea and promoted the EDA technical quick development. The EDA is an electronics design automation of abbreviation, design from the calculator assistance at the beginning of 90s in 20 centuries, calculator assistance manufacturing, calculator assistance test and calculator lend sup
5、port to the concept of engineering a development since then.The EDA technique is to take calculator as tool, design at EDA software terrace up, use the hardware description language HDL completion a design a document, then is of oneself completed logic to edit and translate, turn Chien, partitioned
6、by the calculator, comprehensive, 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. work.The EDA technical emergence, biggest raised efficiency and ma
7、neuverability of electric circuit design, eased to design of labor strength. These spare parts can pass a software plait a distance but as to its hardware structure and work the way carry on heavy Gou and make thus the design of hardware can like software design so convenient fast.The all these bigg
8、est changed a traditional numerical method, design process of the system design and design idea and promoted the EDA technical quick development.Make use of EDA tool, the electronics designer can start design electronics system from the concept, calculate way, agreement.etc., a great deal of work ca
9、n pass calculator completion, and can design the electronics product is from the electric circuit, the function analyze compute of the whole process of design an IC landscape or PCB landscape on board auto processing completion. Use to the EDA concept or category very breadth now.Include in each rea
10、lm of the machine, electronics, correspondence, aviation aerospace, chemical engineering, mineral, living creature, medical science, military.etc., all there is EDA application.The EDA technique has already extensively used in each archduke department, the Qi business unit and research teaching sect
11、ion currently.For example in the airplane the manufacturing the process, from design, performance test and characteristic analytical until fly emulation, may involve an EDA technique.The EDA technique that this text point mainly to the design, PCB design of the electronics electric circuit and IC de
12、sign. The EDA design can is divided into system class, electric circuit class and physics to carry out class. The EDA in common use software and tool pile up one after another and get into an our country currently and have the EDA software of extensive influence to have:MultiSIM 7(the latest edition
13、 of original EWB), PSPICE, OrCAD, PCAD, Protel, Viewlogic, Mentor, Graphics, Synopsys, LSIIogic, Cadence, MicroSim, ISE, modelsim etc.These tools all have stronger function, generally can used for a few aspects, for example a lot of softwares all can carry on an electric circuit design with imitate
14、really, together entering can also carry on PCB to automatically set up cloth line, can output various net form a document with the third square software connect. The VHDL birth in 1982.At the end of 1987, the VHDL is confirm by IEEE and American Ministry of National Defense to describe language for
15、 the standard hardware.Announced VHDL standard edition from the IEEE, IEEE-1076(call 87 versions) after, the each EDA company released own VHDL design environment one after another, or declared that the own design tool can connect with VHDL.Henceforth the VHDL designed realm to get to extensively ac
16、cept in the electronics, and gradually replaced an originally not- standard hardware description language.In 1993, the IEEE carried on to revise to the VHDL, describe ability to up expand a VHDL contents from higher abstract layer and the system, announced the VHDL of new edition.VHDL and Verilog ar
17、e the industrial standard hardware description of the IEEEs language, again arrive support of numerous EDA companies, at electronics engineering realm, have become in general use hardware to describe language in fact.There is expert think, in the new century in, the VHDL will start to undertake a gr
18、eatly part of numerical system design mission at the Verilog language. The VHDL language is a kind of deluxe language which useds for an electric circuit design.It expects to appear after the 80s of.BE at the beginning come out by American Ministry of National Defense development to provide the Amer
19、ican solider with the credibility which uses to raise a design with cut 1 kind of development period to use the scope smaller design language. VHDL,Translating into chinese is soon extremely high the description language of the integrated circuit hardware.So it of the application mainly is an applic
20、ation in the design of numerical electric circuit.Currently, itis in the application most in china is thedesign which uses in the FPGA/CPLD/EPLD.Certainly in some units with stronger real strenght, it is also use to design ASIC. The VHDL mainly useds for the structure, behavior which describes numer
21、ical system, function with connect.In 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 language.VHDL procedure structure characteristics is an engineer
22、ing design, or call that the design entity(can be a component, an electric circuit mold piece or a system) is divided into exterior(or call but part, and port) with inner part(or call to cant see part), since involve internal function and calculate way of entity to complete part of.At to 1 designed
23、entity to define exterior interface after, once it internal development completion after, other designs can directly adjust to use this entity.This kind of will design entity to be divided into a little bit basic VHDL system that is a VHDL system inside the concept of outside part design design of a
24、 little bit basic and other hardware describe the language compare and the VHDL has a following characteristics:The function is strong and the design be vivid.The VHDL has the function strong language structure, can describe a complicated logic control with the simple and direct and explicit source
25、code.It has a multi-layer design description function, in multiple layers thin turn, finally directly born electric circuit class description.The VHDL supports synchronous electric circuit, differences tread electric circuit with random the design of electric circuit, this be the other hardware desc
26、ription although the language cant compare to.The VHDL still supports various design method, since support from the bottom upward design, support again from the design of crest declivity；Since the support mold piece turns a design, support layers turn a design again. Support extensively and be easy
27、to a modification.Because the VHDL has already become IEEE standard the norm of hardware description language, most EDA tools almost support VHDL currently, this is VHDL of further expansion with extensively applied lay foundation.In the design process of the hardware electric circuit, the main desi
28、gn document is the source code which writes with the VHDL, the VHDL easily reads with the structure turn, so be easy to a modification design. The strong system hardware describes ability.The VHDL has a multi-layer design description function, since can describe system class electric circuit, can de
29、scribe door class electric circuit again.And description since can adopt a behavior description, deposit a machine to deliver description or structure description, can also adopt the hybrid description of threes mixture.Moreover, VHDL support is inertial to delay and deliver to delay, can also accur
30、ately build up hardware electric circuit model.VHDL support prepare definite of with from definition of data type, bring hardware description a bigger freedom degree, make design the personnel can expediently establish the system model of high time. The independence is at the design of spare part, have nothing to do with the craft.Dont need to consider a choice completion the spare part of design first while designing a personnel to carry on a design with the VHDL, can concentrate
