计算结构POC报告04009028单佳炯

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1、TheReportofPOCDesignNAME:Shanjiajiong（单佳炯）NUMER:04009028COURSE：COACourseDesignPROJECT：POCDesignDATE：MAR.282012Purpose:Thepurposeofthisprojectistodesignandsimulateaparalleloutputcontroller(POC)whichactsaninterfacebetweensystembusandprinter.TheAltera'sMaxpl

2、usIIEDAtoolisrecommendedandprovidedforsimulation.PleaserefertoWilliam^tallings/XomputerOrganizationandArchitecture,DesigningforPerformance—P・65~75;P.185T90.Tasks:3.ThephysicalmodelofPOCPOCisoneofthemostcommonI/Omodules,namelytheparalleloutputcontroller.It

3、playstheroleofaninterfacebetweenthecomputersystembusandtheperipheral(suchasaprinterorotheroutputdevices).ADRWIRQProcessor,3ER—Bufferregister(8bits)IRQRWDACSSR—Steiusregister(8bits)SR7—ReadyflagbitSRO—InterruptenablebitLSR6-SR1—emptybitsIRQ—intem/ptrequest

4、te/min&lispulledlowwhenSRXSRMPOC—paralleloutputcontrollerSRBRPOC8RDYTRPrinterFigure1PrinterConnectionFigure1showstheconnectingofaprintertothesystembusthroughthePOC・ThecommunicationbetweenPOCandtheprinteriscontrolledbya"handshake"protocolillustratedinFigur

5、e2.OutputdevicetakesthebyteatPDduringthisintervalb.ThelogicalmodelofPOCThehandshakingprocessisdescribedasfollows:Whentheprinterisreadytoreceiveacharacter,itholdsRDY=l.ThePOCmustthenholdacharacteratPD(paralleldata)portandproduceapulseattheterminalTR(transf

6、errequest).TheprinterwillchangeRDYto0,takethecharacteratPDandholdtheRDYat0untilthecharacterhasbeenprinted(e.g.5or10ms),thensetRDY=1againwhenitisreadytoreceivethenextcharacter.(Supposetheprinterhasonlyaonecharacter"buffer"register,sothateachcharactermustbe

7、printedbeforethenextcharacterissent).Inordertoeaseyourdesignwork,thefurtherexplanationsofthePOCoperationsandsomedesignhintsaregivenasfollows:ThebufferregisterBRisusedtoholdacharacterthathasbeensentviathesystembuswhilethatthecharacterisbeingtransferredtoth

8、eprinter.ThestatusregisterSRisusedfortwocontrolfunctions:SR7servesasareadyflagforsystembustransferstoBR(liketheprinterRDYsignalfortransfersfromPOCtotheprinter),andSROisusedtoenableordisableinterruptrequestsfromPOC.I