5口交换机原理图 DM9081芯片

DM908110BASE-THubControllerFinal1Version:DM9081-DS-F01April22,1997GeneralDescriptionThe10BASE-THubController(DM9081)providesasystemlevelsolutionfordesigningIEEE-compliant802.3repeatersthatincorporate10BASE-Ttransceivers.Thisdeviceintegratestherepeaterfunctionsspecifiedbysection9oftheIEEE802.3standard.TheTwistedPairtransceiveriscompliantwith10BASE-Tstandards.TheDM9081provideseightintegralTwistedPairMediaAttachmentUnits(MAUs)andtwoAttachmentUnitInterface(AUI)portsina100-pinQFPpackage.ThetotalnumberofportsperrepeaterunitcanbeincreasedbyconnectingmultipleDM9081chipsviatheirexpansionports.TheDM9081supportsLEDdriverstomonitorportstatus.ItdisplaysLink,CarrierSense,Collision,Partition,andBitRateErrorStatus.Inminimummode,Link,CarrierSense,andCollisionStatuscanbedisplayedwithoutexternalTTLdevices.BlockDiagramTXMUXPREAMBLEJAMSIGNALFIFOMANCHESTERDECODERRXMUXAUIPORT1AUIPORT2TPPORT0TPPORT7PLLMANCHESTERENCODER*****DATAINDATAOUTMUXSTATEMACHINETIMERLEDPORT2LEDPORT1EXPANSIONPORTNRZDATAEXPIN#EXPOUT#DATRXP1RXN1CDP1CDN1TXP1TXN1RXP2RXN2CDP2CDN2TXP2TXN2RXD0+RXD0-TPO0+DTPO0+DTPO0-TPO0-RXD7+RXD7-TPO7+DTPO7+DTPO7-TPO7-AUI1_CRS_LEDAUI2_CRS_LEDCOL_LEDAUI_LEDTP_BIT_LEDTP_POL_LEDTP_JAB_LEDTRAFFIC_LEDTP_PAR_LEDTP_LINK_LEDTCKLED_LATCHRX_CLKDM90812FinalVersion:DM9081-DS-F01April22,1997TableofContentsGeneralDescription.......................................................1BlockDiagram..............................................................1TableOfContents..........................................................2Features.........................................................................3PinConfiguration..........................................................3PinDescription..............................................................4FunctionalDescription..................................................6Repeaterfunction.......................................................6SignalRegeneration...................................................6CollisionFunction......................................................6AutoPartition/Reconnection......................................6FragmentExtension...................................................6LinkIntegrityTest.....................................................6JabberLockupProtection...........................................7Reset..........................................................................7ExpansionPort...........................................................7ExternalLogic...........................................................8LEDFunctions...........................................................9CollisionStatus..........................................................9AUI1PortStatus........................................................9AUI2PortStatus........................................................9MinimumMode.........................................................9TPPortStatus............................................................9NormalMode...........................................................10LEDLatch...............................................................10AUIPortsStatus......................................................11TPPortsBitRateErrorStatus..................................11TPPortsJabberStatus..............................................11TPPortsPartitionStatus...........................................11TrafficStatus............................................................11TPPortLinkStatus..................................................11DM9081ChipExternalComponents........................12AbsoluteMaximumRatings.........................................13DCElectricalCharacteristics.......................................13ACCharacteristics.......................................................14TimingWaveformsExpansionPortInputTiming...................................15ExpansionPortOutputTiming.................................15ExpansionPortCollisionTiming..............................16AUITransmitTiming...............................................16AUIReceiveTiming.................................................17AUICollisionTiming...............................................17TransmitTiming......................................................17ReceiveTiming........................................................18LinkIntegrityTiming...............................................18LayoutRecommendationDecoupling...............................................................19PowerPlane..............................................................19PackageInformation....................................................21OrderingInformation...................................................22CompanyOverview......................................................22ContactWindows.........................................................22DM9081Final3Version:DM9081-DS-F01April22,1997FeaturesRepeaterfunctionscomplywithIEEE802.3RepeaterUnitspecificationEightIntegral10