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RTL8305NB-CGSINGLE-CHIP5-PORT10/100METHERNETSWITCHCONTROLLERDATASHEET(CONFIDENTIAL:DevelopmentPartnersOnly)Rev.1.016October2012TrackID:JATR-3375-16RealtekSemiconductorCorp.No.2,InnovationRoadII,HsinchuSciencePark,Hsinchu300,TaiwanTel.:+886-3-578-0211.Fax:+886-3-577-6047:JATR-3375-16Rev.1.0COPYRIGHT©2012RealtekSemiconductorCorp.Allrightsreserved.Nopartofthisdocumentmaybereproduced,transmitted,transcribed,storedinaretrievalsystem,ortranslatedintoanylanguageinanyformorbyanymeanswithoutthewrittenpermissionofRealtekSemiconductorCorp.DISCLAIMERRealtekprovidesthisdocument‘asis’,withoutwarrantyofanykind.Realtekmaymakeimprovementsand/orchangesinthisdocumentorintheproductdescribedinthisdocumentatanytime.Thisdocumentcouldincludetechnicalinaccuraciesortypographicalerrors.TRADEMARKSRealtekisatrademarkofRealtekSemiconductorCorporation.Othernamesmentionedinthisdocumentaretrademarks/registeredtrademarksoftheirrespectiveowners.USINGTHISDOCUMENTThisdocumentisintendedforthesoftwareengineer’sreferenceandprovidesdetailedprogramminginformation.Thougheveryefforthasbeenmadetoensurethatthisdocumentiscurrentandaccurate,moreinformationmayhavebecomeavailablesubsequenttotheproductionofthisguide.REVISIONHISTORYRevisionReleaseDateSummary1.02012/10/16Firstrelease.RTL8305NBDatasheetSingle-Chip5-Port10/100MbpsEthernetSwitchControlleriiiTrackID:JATR-3375-16Rev.1.0TableofContents1.GENERALDESCRIPTION..............................................................................................................................................12.FEATURES.........................................................................................................................................................................23.SYSTEMAPPLICATIONS...............................................................................................................................................34.BLOCKDIAGRAM...........................................................................................................................................................45.PINASSIGNMENTS.........................................................................................................................................................55.1.PINASSIGNMENTSDIAGRAM.......................................................................................................................................55.2.PACKAGEIDENTIFICATION...........................................................................................................................................55.3.PINASSIGNMENTSTABLE............................................................................................................................................66.PINDESCRIPTIONS.........................................................................................................................................................76.1.PINASSIGNMENTCODES.............................................................................................................................................76.2.MEDIACONNECTIONPINS...........................................................................................................................................76.3.MISCELLANEOUSPINS.................................................................................................................................................86.4.PORTLEDPINS...........................................................................................................................................................86.5.STRAPPINGPINS...........................................................................................................................................................96.6.REGULATORPINS.........................................................................................................................................................96.7.POWERANDGNDPINS................................................................................................................................................97.BASICFUNCTIONDESCRIPTIONS...........................................................................................................................107.1.SWITCHCOREFUNCTIONOVERVIEW.........................................................................................................................107.1.1.FlowControl........................................................................................................................................................107.1.1.1IEEE802.3xFullDuplexFlowControl........................................................................................................................107.1.1.2HalfDuplexBackPressure...........................................................................................................................................107.1.2.AddressSearch,Learning,andAging.................