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IEEE 1588 Precision Time Protocol Time …

ApplicationReportSNLA098A October2007 , October2007 RevisedApril2013AN-1728 IEEE1588 PrecisionTimeProtocolTimeSynchronization PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013,TexasInstrumentsIncorporatedStandar d EthernetSoftwareIEEE 1588 Hardware Assisted IEEE 1588 NTP1588 PTP1588 PTPTCP/IP/UDPTCP/IP/UDPS tandard MACS tandard PHYP recision PHYTER with H/W 1588 Timestamps + Clock + GPIOPHYTERC ustom FPGA or PControllerStandard MAC100 ms100 Ps - 10 Ps100 ns - 50 ns5 nsHuman ControlProcess ControlMotion ControlPrecision (PTP)is factoryautomation,testandmeasurement, oftenwellbeyondwhatcanbeprovidedbya (NTP) ,singlelinksynchronizationin Figure1, hardwareassistanceis requiredtoachievetimesynchronizationin synchronizationrequestis , ,adjustingandmaintainingthesynchronizedl ocalclock, theEthernetPHYasshownin Figure2, ,theprecisionPHYTERis ,thissolutioncanb

Application Report SNLA098A– October 2007– Revised April 2013 AN-1728IEEE 1588 Precision Time Protocol Time Synchronization Performance

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Transcription of IEEE 1588 Precision Time Protocol Time …

1 ApplicationReportSNLA098A October2007 , October2007 RevisedApril2013AN-1728 IEEE1588 PrecisionTimeProtocolTimeSynchronization PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013,TexasInstrumentsIncorporatedStandar d EthernetSoftwareIEEE 1588 Hardware Assisted IEEE 1588 NTP1588 PTP1588 PTPTCP/IP/UDPTCP/IP/UDPS tandard MACS tandard PHYP recision PHYTER with H/W 1588 Timestamps + Clock + GPIOPHYTERC ustom FPGA or PControllerStandard MAC100 ms100 Ps - 10 Ps100 ns - 50 ns5 nsHuman ControlProcess ControlMotion ControlPrecision (PTP)is factoryautomation,testandmeasurement, oftenwellbeyondwhatcanbeprovidedbya (NTP)

2 ,singlelinksynchronizationin Figure1, hardwareassistanceis requiredtoachievetimesynchronizationin synchronizationrequestis , ,adjustingandmaintainingthesynchronizedl ocalclock, theEthernetPHYasshownin Figure2, ,theprecisionPHYTERis ,thissolutioncanbeaddedtoanexistingprodu ctdesignbysimplyreplacingtheEthernetPHYa ndaddingIEEE1588 PTPsoftware,avoidingthecomplicationsofmo vingtoa October2007 RevisedApril2013 PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013,TexasInstrumentsIncorporatedMagneti csandRJ-45 Ethernet MACM icrocontrollerISRN etwork StackEthernet is difficulttoassesstheleveloftimesynchroni zationthata systemis capableofachievingbecausethereis.

3 Softwaretesting,pulsepersecondsignalcomp arison, thatit cannotcorrectfordifferencesin reportinganerrorthatis essentiallyduetothedriftbetweentwoclocks ,thesoftwareerrorrepresentsa (PPS) pulseateverysecondtransitionproducesa ,thePPSsignalis correlationbetweenthesecondtransitionand theclocksynchupdate,it is thatthePPSsignalis typicallygeneratedfroma ,butnotthesynchronizedclockitselfand,thu s,shouldnotbeincludedin setboththemasterandslavetogeneratea clockoutputata second,providinga , handledbythecomputerwhilethehardwareport ionofthePTPprotocolremainsin October2007 RevisedApril2013AN-1728 IEEE1588 PrecisionTimeProtocolTimeSynchronization PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013.

4 CReferenceFrequencySourceOn-board25 MHzcrystalIEEE1588 PTPS ynchronizationInterval1 representsa typicalplotoftheclocksynchronizationerro r,asreportedbythesoftware, , theeffectsofthePTPsynchronizationalgorit hmcaneasilybeseenin October2007 RevisedApril2013 PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013,TexasInstrumentsIncorporatedMaster DP83640 DeviceSlave DP83640 DeviceMaster SystemSlave SystemPPSO utputPPSO utputMII InterfaceMII InterfaceNetwork Cable(CAT5)Histogram Enabled October2007 RevisedApril2013AN-1728 IEEE1588 PrecisionTimeProtocolTimeSynchronization PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013, CReferenceFrequencySourceOn-board25 MHzcrystalIEEE1588 PTPS ynchronizationInterval1 representsa , theclocktoclocksynchronizationis withina meandifferenceofonly representedin October2007 RevisedApril2013 PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013.

5 TexasInstrumentsIncorporatedMaster DP83640 DeviceSlave DP83640 DeviceMaster SystemSlave SystemClockOutputClockOutputMII InterfaceMII InterfaceNetwork Cable(CAT5)Histogram Enabled CReferenceFrequencySourceOn-board25 MHzcrystalClockOutputFrequency10 MHzIEEE1588 PTPS ynchronizationInterval1 representsa ,theclocktoclocksynchronizationis withina meandifferenceofonly October2007 RevisedApril2013AN-1728 IEEE1588 PrecisionTimeProtocolTimeSynchronization PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013, ClockOutputJitterHistogramAnotherwaytose etherelationshipbetweenthemasterandslave clockoutputsis settoinfinitepersistence, shownonthetopandtheslaveclockoutputis.

6 S October2007 RevisedApril2013 PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013, hardwaredevelopertodevelopa verycapable, ,PPSsignalanalysis, October2007 RevisedApril2013AN-1728 IEEE1588 PrecisionTimeProtocolTimeSynchronization PerformanceSubmitDocumentationFeedbackCo pyright 2007 2013,TexasInstrumentsIncorporatedIMPORTA NTNOTICET exasInstrumentsIncorporatedanditssubsidi aries(TI)reservetherighttomakecorrection s,enhancements,improvementsandotherchang estoitssemiconductorproductsandservicesp erJESD46,latestissue,andtodiscontinueany productorserviceperJESD48, (alsoreferredtohereinas components )

7 AresoldsubjecttoTI s ,in accordancewiththewarrantyin TI s ,testingofallparametersofeachcomponentis productsandapplications, ,eitherexpressorimplied,is grantedunderanypatentright,copyright,mas kworkright,orotherintellectualpropertyri ghtrelatingtoanycombination,machine,orpr ocessin licensetousesuchproductsorservicesora licensefroma thirdpartyunderthepatentsorotherintellec tualpropertyofthethirdparty,ora TIdatabooksordatasheetsis permissibleonlyif reproductionis withoutalterationandis accompaniedbyallassociatedwarranties,con ditions,limitations, is solelyresponsibleforcompliancewithallleg al,regulatoryandsafety-relatedrequiremen tsconcerningitsproducts,andanyuseofTIcom ponentsin itsapplications, hasallthenecessaryexpertisetocreateandim plementsafeguardswhichanticipatedangerou sconsequencesoffailures,monitorfailuresa ndtheirconsequences, , ,TI s goalis , FDAC lassIII(orsimilarlife-criticalmedicalequ ipment)unlessauthorizedofficersofthepart ieshaveexecuteda enhancedplastic solelyattheBuyer's risk,andthatBuyeris solelyresponsibleforcompliancewithallleg alandregulatoryrequirementsin.

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