DDR-SDRAM PCB LAYOUT设计资料

POLLUXApplicationProcessorPreliminaryReleaseVersion0.80DocumentRelease2008/2/22Copyright©2008MagicEyesDigitalCo.,Ltd.ThecontentofthisdocumentissolepossessedbyMagicEyesDigitalCo.,Ltd.Thedocumentanditscontentmaynotbecopiedordisclosedwithoutpriorwrittenconsent.ApplicationNoteForPOLLUX-MCU-YApplicationNoteMDPOLLUXAPNVerPreliminary0.80/Feb22,2008POLLUXApplicationNoteforPOLLUXApplicationProcessorPOLLUXApplicationProcessorImportantNoticeInformationinthisdocumentisprovidedsolelytoenablesystemandsoftwareimplementerstouseMagicEyesproducts.MagicEyeshavecheckedtheinformationinthisdocumentcarefullyandbelievetheaccuracy.HoweverMagicEyesassumesnoresponsibilityforpossibleerrorsoromissionsherein.MagicEyesreservestherighttomakechangesinitsproductsorproductspecificationsatanytimewithoutnoticeandisnotrequiredtoupdatethisdocumentationtoreflectsuchchanges.MagicEyesmakesnowarranty,representationorguaranteeregardingthesuitabilityofitsproductsforanyparticularpurpose,nordoesMagicEyesassumesanyliabilityarisingoutoftheapplicationoruseofanyproductorcircuitandspecificallydisclaimsanyandallliability,includingwithoutlimitationconsequentialorincidentaldamages.“Typical”parameterswhichmaybeprovidedinthisdocumentscananddovaryindifferentapplication.Alloperatingparameters,including“Typicals”mustbevalidatedforeachcustomerapplicationbycustomer’stechnicalexperts.MagicEyesdoesnotconveyanylicenseunderitspatentrightsnortherightsofothers.MagicEyesproductsarenotdesigned,intended,orauthorizedforuseascomponentsinsystemintendedforsurgicalimplantintothebody,forotherapplicationsintendedtosupportorsustainlife,orforanyotherapplicationinwhichthefailureoftheMagicEyesproductcouldcreateasituationwherepersonalinjuryordeathmayoccur.ShouldtheBuyerpurchaseoruseaMagicEyesproductforanysuchunintendedorunauthorizedapplication,theBuyershallindemnifyandholdMagicEyesanditsofficers,employees,subsidiaries,affiliatesanddistributorsharmlessagainstallclaims,costs,damages,expensesandreasonableattorneyfeesarisingoutof,eitherdirectlyorindirectly,anyclaimorpersonalinjuryordeaththatmaybeassociatedwithsuchunintendedorunauthorizeduse,evenifsuchclaimallegesthatMagicEyeswasnegligentregardingthedesignormanufactureofsaidproduct.©MagicEyesDigitalAllrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans,electricormechanical,byphotocopying,recording,orotherwise,withoutthepriorwrittenconsentofMagicEyesDigital.HOWTOREACHUS:MagicEyesDigitalCo.,Ltd.463-824,UniquestBD4F,271-2Seohyeon-Dong,Bundang-GuSeongnam-City,Gyeonggi-Do,KoreaTEL:82-31-788-0300FAX:[phone]HOMEPAGE:.......................................................................................................................................................................11.1.OVERVIEW............................................................................................................................................................11.2.BLOCKDIAGRAM..................................................................................................................................................11.3.DESCRIPTION.........................................................................................................................................................11.3.1.POLLUXMCU-YbankMemoryMap.........................................................................................................11.3.2.DDR-SDRAMConnection...........................................................................................................................21.3.3.MCU-YbankCapacity..................................................................................................................................21.3.4.UseofaDampingResistor............................................................................................................................21.3.5.CautionsfortheDesignofReferenceVoltage..............................................................................................21.3.6.ActualexampleforDDR-SDRAMconnection.............................................................................................31.3.6.1.Case1:OneDDR-SDRAMsystem........................................................................................................................31.3.6.2.Case2:TwoDDR-SDRAMsystem........................................................................................................................41.3.7.PCBLayout...................................................................................................................................................41.3.7.1.PCBlayoutrulerelatedtoDDR-SDRAM...............................................................................................................41.3.7.2.RecommendvaluesforDDR-SDRAMsignal’slengthandwidth...........................................................................5POLLUXApplicationNoteApplication