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ID:5699714
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时间:2017-12-22
《毕业设计(论文)-基于vhdl语言的hdb3码的编码和译码》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要伴随着集成电路技术的发展,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。EDA的一个重要特征就是使用硬件描述语言(VHDL)来完成设计文件。诞生于1982年的VHDL语言是经IEEE确认的标准硬件描述语言,在电子设计领域受到了广泛的接受。数字基带信号的要求主要有两点,第一是对各种代码的要求,期望将原始信息符号编制成适合于传输用的码型;第二则是对所选的码型的波形的要求,期望波形适宜于在信道中传输。HDB3编码是数字基带信号传输中常用的传输码型,因其具
2、有无直流成分,低频成分少和连零位数目最多不超过三个等明显的优点,对时钟信号的恢复十分有利而成为普遍使用的基带传输码之一。本设计是在QuartusII开发环境下采用VHDL语言的,设计HDB3编码器和译码器。根据编码规则将译码器分为三个部分:插V模块、插B模块、单极性变双极性模块。根据译码规则,译码器只包含一个模块。最后,对每个模块进行仿真,实现相应功能后再进行整体仿真。关键词HDB3VHDL编码译码IAbstractTheElectronicDesignAutomation(EDA)technol
3、ogyhasbecomeanimportantdesignmethodofanaloganddigitalcircuitsystemgrowing.OneimportantcharacteristicoftheEDAAsistheintegratedcircuitoneofthestandarddescriptionlanguagesvalidatedbyIEEE,whichwasfirstlyintroducedin1982.Anditwaswidelyusedbyelectronicdesig
4、nernow.Therequirementsofdigitalbasebandsignalsaretwopoints,Thefirstistherequirementofvariouscode,expectedthepreparationoftheoriginalinformationsymbolsusedtopatterninaformsuitablefortransmission;Thesecondistherequirementsofthepatternoftheselectedwavefo
5、rm,expectedwaveformsuitablefortransmissioninthechannel.TheHDB3codingschemeiscommonlyusedindigitalbasebandtransmission.TheHDB3code,whichhasfeaturesofzeroDCbiasviaalternatingpositive-negativevoltagelevelbitbybitandnomorethanthreecontinuous-zerobits,dedu
6、cesthepowerdissipationandmakesthereceivingdeviceeasytorecovertheclockinthetransmittedcodestream.somymajorcontentofgraduateddesignisdesigningbasedontheHDB3volume/decoderofVHDLlanguage,therequirementthatitwillreachisthebasicskillthatcanrealizeHDB3volume
7、/decoderfunctioninsoftwarecan,andcancoordinateentiredesign,makesureitreachtherequirementthatanticipated.ThisdesigninQuartusIIdevelopmentenvironmentusesVHDLlanguagetodesignHDB3encoderanddecoder.Accordingtotheencodingrules,therearethreepartsindecoder:in
8、sertthemoduleV,insertthemoduleB,theunipolarvariablebipolarmodule..Accordingtothedecodingrules,decodercontainsonlyonemodule.Finally,thesimulationofeachmodule,itachievethecorrespondingfunctionandthenachievethewholesimulation.KeywordsVHDLHDB3Enco
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