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《OrCAD Capture User Guide -- 6. Establishing connectivity 》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、OrCADCaptureUserGuide,ProductVersion16.36EstablishingconnectivityThischaptercovers:"Placingandnamingwires"."Auto-wiringthepartsonaschematic""Placingbusesandbusentries"."Placingpower,ground,andnoconnectsymbols"."Makingpowerpinsvisible"."BrowsingforPowerPins"."Placingoff-pageconnectors"."Establishin
2、gconnectivityamongstschematicpages"."Usingintersheetreferences"."Workingwithnets".EstablishingbusconnectivityTomakeconnectionstoabus,youlabelthebus,labelthesignalsthataremembersofthebus,andassignanaliastoeachsignalenteringandleavingthebus.Eachsignalbearsanaliasthatiswithinthebusrange.Forexample,if
3、thebusaliasisADDR[0..3],thefourbusmembersmustbearaliasesADDR0,ADDR1,ADDR2,andADDR3.InCapture,youcanuseanaliastoconnectasignalfromoneareaofyourschematicpagetoanotherwithoutplacingabusbetweentheareas.Forexample,supposeyouhaveplacedthebusTIMING[1..4]onyourschematicpageandyouwanttoconnectittoanotherob
4、jectattheoppositecorneroftheschematicpage.InsteadofdrawingabusfromTIMING[1..4]totheotherobject,youcanassignthealiasTIMING[1..4]totheotherobject.Toprovideavisualcuethatasignalistiedtoabus,youcanphysicallyconnectthesignal1tothebus.Itisrecommendedthatyouuseabusentryforthisconnection.Theadvantageofusi
5、ngabusentryisthattwobusentriescanbeconnectedatthesamepointonabuswithoutconnectingthesignals.Iftwowiresarerundirectlytoabusatthesamelocation,thesignalsareconnected.EstablishingwireconnectivityInCapture,youcanestablishconnectivityeitherwithwiresoraliases.Twoperpendicularwiresorbusesareconnectedif:Th
6、eyforma"T"intersection,eitherbydragginganobjectorplacingawire.Ajunctionisplacedwheretheycross.Iftheysimplycrossat90degrees,theyarenotelectricallyconnectedunlessyoumanuallyplaceajunctionattheintersection.Youcanalsouseanaliastoconnectasignalfromoneareaofyourschematicpagetoanother.Forexample,supposey
7、ouhaveplacedapartonyourschematicpageandyouwanttoconnectittoanotherpartattheoppositecorneroftheschematicpage.Insteadofdrawingawirefromthefirstparttothesecondpart,youcanassignasinglenetaliastoawireconnectedtobothpa
