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【正文】 ormance test and characteristic analytical until fly emulation, may involve an EDA EDA technique that this text point mainly to the design, PCB design of the electronics electric circuit and IC design. The EDA design can is divided into system class, electric circuit class and physics to carry out class. The EDA in mon use software:The EDA 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 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 really, together entering can also carry on PCB to automatically set up cloth line, can output various form a document with the third square software connect. The VHDL English full name be the HardwareDescription Language of the Integrated Circuit of the VeryHighSpeed, birth in the end of 1987, the VHDL is confirm by IEEE and American Ministry of National Defense to describe language for the standard VHDL standard edition from the IEEE, IEEE1076(call 87 versions) after, the each EDA pany released own VHDL design environment one after another, or declared that the own design tool can connect with the VHDL designed realm to get to extensively accept in the electronics, and gradually replaced an originally not standard hardware description 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, namely IEEE standard of 10761993 editions, .(call 93 versions)Now, VHDL and Verilog are the industrial standard hardware description of the IEEEs language, again arrive support of numerous EDA panies, at electronics engineering realm, have bee in general use hardware to describe language in is expert think, in the new century in, the VHDL will start to undertake a greatly 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 expects to appear after the 8039。s at the beginning e out by American Ministry of National Defense development to provide the American solider with the credibility which uses to raise a design with cut 1 kind of development period to use the scope smaller design language. All of VHDL 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 th
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