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1、武汉轻工大学毕业设计外文参考文献译文本2013届原文出处：fromVinSkahill.VHDLforProgrammableLogicpage76-88毕业设计题目：基于FPGA的数字频率计设计院（系）：电气与电子工程学院专业名称：电子信息科学与技术学生姓名：学生学号：指导教师：IntroductionofdigitalfrequencymeterDigitalFrequencyisanindispensableinstrumentofcommunicationsequipment,audioandvideo,andotherareasofscientificrese
2、archandproduction.Inadditiontotheplasticpartofthemeasuredsignal,anddigitalkeyforapartoftheshow,allthedigitalfrequencyusingVerilogHDLdesignedandimplementedachieveinanFPGAchip.Theentiresystemisverylean,flexibleandhaveamodificationofthescene.1、AndotherprecisionmeasuringfrequencyPrincipleFre
3、quencymeasurementmethodscanbedividedintotwokinds:(1)directmeasurementmethod,thatis,atacertaintimemeasurementgatemeasuredpulsesignalnumber.(2)indirectmeasurements,suchasthecyclefrequencymeasurement,VFconversionlaw.FrequencyMeasurementindirectmeasurementmethodappliesonlytolow-frequencysign
4、als.Basedontheprinciplesoftraditionalfrequencymeasurementofthefrequencyofmeasurementaccuracywillbemeasuredwiththedeclineinsignalfrequencydecreasesinthemorepracticallimitations,suchastheaccuracyandfrequencyofmeasurementnotonlyhashighaccuracy,butalsointhewholefrequencyregiontomaintainconst
5、anttestaccuracy.ThemainmethodofmeasurementfrequencymeasurementPreferencesgatedsignalGATEissuedbytheMCU,GATEtimewidthonthefrequencymeasurementaccuracyoflessimpact,inthelargercontextofchoice,aslongastheFPGAin32of100inthecounterbMSignalsarenotoverflowline,inaccordancewiththetheoreticalcalcu
6、lationGATEtimecanbegreaterthanthewidthTc42.94s,butduetothesingle-chipmicrocomputerdataprocessingcapacityconstraints,theactualwidthoflesstime,generallyintherangeofbetween0.1schoice,thatis,high-frequency,shortergate;,lowgatelonger.ThistimegatewidthTcbasedonthesizeofthemeasuredfrequencyauto
7、maticallyadjustfrequencymeasurementinordertoachievetheautomaticconversionrange,andexpandedtherangeoffrequencymeasurement;realizationoftheentirescopeofmeasurementaccuracy,reducethelow-frequencymeasurementerror.Thedesignofthemainmethodsofmeasuringthefrequencymeasurementandc
