TheOX16PCI954isasinglechipsolutionforPCI-basedserialandparallelexpansionadd-inca***.ItisadualfunctionPCIdevice,wherefunction0offersfourultra-highperformanceOX16C950UARTs,andfunction1isconfigurabletooffereitheran8bitLocalBusorabi-directionalparallelport.Serialportca***withupto8ports(orwith4serialportsandaparallelport)canbedesignedwithoutredefininganydeviceortimingparameters.EachchannelintheOX16PCI954,thefastest***ailablePC-compatibleUART,offersdataratesupto15Mbpsand128-deeptran***itterandreceiverFIFOs.DeepFIFOsreduceCPUoverheadandallowutilisationofhigherdatarates.Eachchannelissoftwarecompatiblewiththewidelyusedindustry-standard16C550devicesandcompatiblesaswellastheOX16C95xfamilyofhighperformanceUARTs.InadditiontoincreasedperformanceandFIFOsize,theUARTsalsoprovidethefullsetofOX16C95xenhancedfeaturesincludingautomatedin-bandflowcontrol,readableFIFOlevelsetc.Theefficient32-bit,33MHztarget-onlyPCIinterfaceiscompliantwithversion2.2ofthePCIBusSpecificationandversion1.0ofPCIPowerManagementSpecification.Forapplicati***thatdonotrequiretheinternalparallelportorthelocalBus,carddesignerscanassignaSubsystemVendorIDandaSubsystemIDusing32inputpins.IftheUARTsarenotrequired,theLocalBuscanbeextendedfrom8-bitoperationtoafull32-bitpass-throughinterface.)