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兰州交通大学毕业设计（论文）I摘要伴随着集成电路(IC)技术的发展，电子设计自动化(EDA)逐渐成为重要的设计手段，已经广泛应用于模拟与数字电路系统等许多领域。电子设计自动化是一种实现电系统或电子产品自动化设计的技术，它与电子技术、微电子技术的发展密切相关，它吸收了计算机科学领域的大多数最新研究成果，以高性能的计算机作为工作平台，促进了工程发展。数字频率计是一种基本的测量仪器。它被广泛应用与航天、电子、测控等领域。采用等精度频率测量方法具有测量精度保持恒定，不随所测信号的变化而变化的特点。本文首先综述了EDA技术的发展概况，FPGA/CPLD开发的涵义、优缺点，VHDL语言的历史及其优点，概述了EDA软件平台QUARTUSⅡ；然后介绍了频率测量的一般原理，利用等精度测量原理，通过FPGA运用VHDL编程，利用FPGA(现场可编程门阵列)芯片设计了一个8位数字式等精度频率计，该频率计的测量范围为0-100MHZ,利用QUARTUSⅡ集成开发环境进行编辑、综合、波形仿真，并下载到CPLD器件中，经实际电路测试，仿真和实验结果表明，该频率计有较高的实用性和可靠性。关键词:电子设计自动化；VHDL语言；频率测量；数字频率计兰州交通大学毕业设计（论文）IIAbstractTheElectronicDesignAutomation(EDA)technologyhasbecomeanimportantdesignmethodofanaloganddigitalcircuitsystemastheintegratedcircuit'sgrowing.TheEDAtechnology,whichiscloselyconnectedwiththeelectronictechnology,microelectronicstechnologyandcomputerscience,canbeusedindesigningelectronicproductautomatically.Digitalfrequencymeterisabasicmeasuringinstruments.Itiswidelyusedinaerospace,electronics,monitoringandotherfields.Withequalprecisionfrequencymeasurementaccuracytomaintainaconstant,andnotwiththemeasuredsignalvaries.WefirstlypresentsomebackgroundinformationofEDA,FPGA/CPLD,VHDLandtheEDAsoftwareplatformQUARTUSⅡinthisthesis;thenintroducedthegeneralprincipleoffrequencymeasurement,utilizationofprecisionmeasuringprinciple,usingVHDLprogramming,useofFPGA(FieldProgrammableGateArray)chipdesignsuchastheprecisionofadigitalfrequencymeter,thisfrequencymeter'smeasuringrangeis0-100MHZ,useQUARTUSⅡintegrateddevelopmentenvironmentforediting,synthesis,wavesimulation,anddownloadtotheCPLDdevice,bytheactualcircuittesting,simulationandexperimentalresultsshowthatthefrequencymeterhashighpracticalandreliability.Keywords:ElectronicDesignAutomation,VHDL,Frequencymeasurement,digitalfrequencymeter兰州交通大学毕业设计（论文）III目录摘要.........................................................................................................................................IABSTRACT..............................................................................................................................II目录........................................................................................................................................III1.绪论...................................................................................................................................11.1电子设计自动化(EDA)发展概述..................................................................................21.1.1什么是电子设计自动化(EDA)................................................................................21.1.2EDA的发展历史........................................................................................................21.2基于EDA的FPGA/CPLD开发..................................................................................41.2.1FPGA/CPLD简介.......................................................................................................41.2.2用FPGA/CPLD进行开发的优缺点.........................................................................51.3硬件描述语言(HDL)......................................................................................................71.3.1VHDL语言简介.........................................................................................................71.3.2利用VHDL语言开发的优点...................................................................................81.4QUARTUSII概述.............................................................................................................92.频率测量...........................................................................................................................112.1数字频率计工作原理概述..........................................................................................112.2测频原理及误差分析..................................................................................................122.3.1常用测频方案..........................................................................................................122.3.2等精度测频原理......................................................................................................122.3.3误差分析..................................................................................................................13本章小结...............................................................................................................................143.数字频率计的系统设计与功能仿真...............................................................................153.1系统的总体设计..........................................................................................................153.2信号源模块..................................................................................................................163.3分频器..........................................................................................................................173.4测频控制信号产生器..................................................................................................183.5锁存器..........................................................................................................................193.6十进制计数器............................................