pcb布线设计规则

1、DesignRulesReferenceSummaryTechnicalReferenceTR0116(v1.8)May20,2008ThiscomprehensivereferenceprovidesdetailedinformationonsettingupdesignrulesforaPCBdesign.Italsocoversadditionofrule-basedparameterstoobjectsintheschematicandDesignRuleChecking.Detailedinformationforeachoftheindividualruletypesandtheirassociatedconstraintsisalsoprovided.PCBdesignisnolongeramatterofplacingtrackstocreateconnections.HighspeedlogiccombinedwithsmallerandmorecomplexpackagingtechnologiesplacenewdemandsonthePCBDesigner.I。

2、tisnotpossibletosatisfyalltherequirementsofthedesignbyonlyconsideringtheclearancebetweentracks,padsandvias.Designstodaycanalsorequirethatyouapplyspecificrequirementstoindividualnets,componentsorregionsoftheboardaswellasconsideringsuchissuesascrosstalk,reflectionsandnetlengths.AltiumDesigner'sPCBEditorallowsyoutodefinedesignrulesthatmonitorandtestfortheseandotherrequirements.DesignrulescollectivelyformaninstructionsetforthePCBEditortofollow.Eachrulerepresentsarequirementofyourdesignandmanyoftheru。

3、les,eg.clearanceandwidthconstraints,canbemonitoredasyouworkbytheonlineDesignRuleChecker(DRC).Certainrulesaremonitoredwhenusingadditionalfeaturesofthesoftware,forexamplerouting-basedruleswhenusingtheSitusAutoroutertorouteadesign,orsignalintegrity-basedrulesusedbytheSignalIntegrityAnalyzerwhenperformingadetailedsignalintegrityanalysisofadesign.ThePCBEditorprovidesapowerfulinterfacefromwhereyoucandefinethevariousdesignrulesasrequired.Therulesthemselvesaredividedintothefollowingcategories:•Electrica。

4、lElectricalRoutingSMTSignalIntegrityClearanceShort-CircuitUn-RoutedNetUn-ConnectedPinWidthRoutingTopologyRoutingPriorityRoutingLayersRoutingCornersRoutingViaStyleFanoutControlDifferentialPairsRoutingSMDtoCornerSMDtoPlaneSMDtoNeck-DownSolderMaskExpansionPasteMaskExpansionSignalStimulusOvershoot-FallingEdgeOvershoot-RisingEdgeUndershoot-FallingEdgeUndershoot-RisingEdgeImpedanceSignalTopValueSignalBaseValueFlightTime-RisingEdgeFlightTime-FallingEdgeSlope-RisingEdgeSlope-FallingEdgeSupplyNetsPlaceme。

5、ntRoomDefinitionComponentClearanceComponentOrientationsPermittedLayersNetstoIgnoreHeightManufacturingMinimumAnnularRingAcuteAngleHoleSizeLayerPairsTestpointTestpointStyleTestpointUsagePowerPlaneConnectStylePowerPlaneClearancePolygonConnectStyleHighSpeedParallelSegmentLengthMatchedNetLengthsDaisyChainStubLengthViasUnderSMDMaximumViaCountMaskPlanePCBDesignRules•Placement•Routing•Manufacturing•SMT•Plane•Mask•Testpoint•HighSpeed•SignalIntegrity.Withawell-definedsetofdesignrules,youcansuccessfullycom。

6、pleteboarddesignswithvaryingandoftenstringentdesignrequirements.ThisisfurtherenhancedbythefactthatthePCBEditorallowsyoutoexportandimportrulesets,enablingyoutostoreandretrieveyourfavoritedesignruleconfigurations,dependingonthejobathand.TR0116(v1.8)May20,20081DesignRulesReferenceCreatingandEditingDesignRulesinthePCBDocumentTosetupnewdesignrulesoreditexistingonesforthecurrentdesign,fromthePCBdocumentselectDesign»RulestoopenthePCBRulesandConstraintsEditordialog.Inthefolder-treepaneontheleftsideofthe。

7、dialog,eachofthetendesignrulecategoriesarelistedundertheDesignRulesfolder.Clickontherootfolder(DesignRules)toaccessasummarylisting-inthemaineditingwindowofthedialog-ofallspecificrulesthathavebeendefinedforalldesignruletypes,acrossallcategories(asshowninthepreviousimage).Clickonacategorytolistallspecificrulesthathavebeendefinedforallassociateddesignruletypesofthatcategory.Clickonaruletypetolistallspecificrulesthathavebeendefinedforthattype.Ineachcase-whetheryouhaveclickedontherootfolder,acategory。

8、oratype-themaineditingwindowofthedialogwilldisplaythefollowingsummaryinformationforeachdefinedrule:•therulename•thetypeofruleitis•therulecategoryitbelongsto•thescopeoftherule(i.e.whatobject(s)itappliesto)•theconstraintattributesthathavebeendefinedfortherule•therule'spriority.Youcanalsoenable/disablearulefromwithinthesesummarylistviews.2TR0116(v1.8)May20,2008DesignRulesReferenceCreatingaNewRuleAnewrulecanbecreatedbyright-clickingontherequiredruletypeinthefolder-treepaneandchoosingNewRulefromthepo。

9、p-upmenu.Alternatively,pressingtheRuleWizardbuttonatthebottomofthedialogwilllaunchtheNewRuleWizard.FollowthepagesinthiswizardtoquicklycreateanewdesignruleofanytypeThenewrulewillbeaddedtothefolder-treeandwillalsoappearinthesummarylistforthatruletype.Therulenamewillappearboldtodistinguishitasbeingnewandyettobe'applied'.EditingaRuleToeditthescopeandconstraintattributesforarule,eitherclickontheentryfortheruleinthefolder-treepaneordouble-clickonitsentryinasummarylist.Themaineditingwindowofthedialogwi。

10、llchangetogiveaccesstothecontrolsfordefiningthescopeandconstraintattributesforthatrule.TheexampleimagebelowshowsthecontrolsaccessedforaSolderMaskExpansionrule.Changesmadetoexistingruledefinitionsarehighlightedinboththefolder-treepaneandtheapplicablesummarylists.Suchentriesaredistinguishedbytherulenamebecomingboldandanasteriskdisplayedtotherightofthename.Theasteriskisusedtoreflectthattheruleisanexistingrulethathasbeenmodified,ratherthananewlycreatedrule(whichisdisplayedboldwithoutanasterisk).TR011。