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1、AbstractAutomaticTestSystemisabranchofdiscipline,whichisdevelopingveryrapidly,oneofthemostimportantsignisthetestsystembus.DuetothelackofEthernetLXIbusbeabletosuccessfullyovercomeavarietyoftraditionaltestbus,promisingtoplayaverybigroleinourfuturemodeltes
2、tingtechniques.IEEE1588isaveryimportantfeatureoftheLXIbusinindustrialautomation,powerautomation,andmulti-sensornetworks,playedasignificantrole.Itenablesavarietyofdifferentnetworkaccuracy,resolutionandstabilityoftheclocksynchronizationup,takeupminimalnet
3、workresourcesandtheresourcesofthelocalmachine,butitenablesthenetworktoachievesub-microsecondsynchronizationaccuracy.Firstly,abriefdescriptionofthewholeoperationprocessoftheIEEE1588protocol.ThesystemintroducesanumberofthecontentofthisAgreement,includingt
4、heclockmodel,datasets,aswellaseventhandling,andbestmasterclockalgorithm,alsodescribedthecoreideaoftheagreement,andagreementterms,conceptsandotherdetailsweremadeindetail.TheinternalstructureoftheIEEE1588protocolhardwaretimestampthatexplainthestructureand
5、roleofthedivisionofthemodulesandeachmoduleIEEE1588protocoltoPTPmessageframeinFPGAhardwaretimestamp,totheIEEE1588protocolsynchronizationaccuracyrequirements.Describesthestructureofthetestplatformusedbythisproject,andthenbrieflytheconceptsandfeaturesofSOP
6、CandNIOSIIsystem,andthenusedforthissubject,moduleonebyonetomakeexplanations.Finally,tobuildagoodPTPmessageofNiosIIsystemtosend,receive,andusethePCtotestthecorrectnessofthePTPmessagessent.KEYWORDS:IEEE1588,PTP,LXI,Clocksynchronization,hardwaretimestamp目录
7、摘要IAbstractII第1章绪论11」课题来源及研究目的和意义11.2IEEE1588背景介绍21.2.1吋间协议的产生21.2.2吋间协议发展历程简介31.3IEEE1588协议发展概况41.3.1IEEE1588协议的产生和修订41.3.2IEEE1588协议在国内外的应用情况41.4论文主要研究内容51.4.1实现IEEE1588协议的方案选择51.4.2本课题的整体框图71.5论文结构安排7第2章IEEE1588协议简介92.1IEEE1588协议操作概述92.2IEEE1588基本时间同
8、步机制102.3IEEE1588协议的相关定义112.3.1基本名词112.3.2PTP系统模型122.3.3PTP数据类型132.4IEEE1588协议PTP时钟模型162.4.1PTP协议第一版时钟模型172.4.2PTP协议第二版透明时钟模型182.5IEEE1588协议PTP时钟端口状态及其改变机制192.5」PTP时钟端口状态192.5.2PTP时钟协议引擎状态机212.5.3PTP时钟状态触发事件221.5IEEE1588协议最佳主时钟算法2
