东南大学POC设计报告(附源程序vhdl).doc

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1、ComputerOrganizationandArchitectureCourseDesignAparalleloutputcontroller[POC]SchoolofInformationScienceandEngineeringSoutheastUniversity2012-3-12CONTENTS1.Purpose22.Tasks23.Top-LevelStructure3·Components·Inputs·Outputs.POC’sinsidesignals4.InputWavefor

2、ms65.Simulationresults71)Basicfunction……………………………………………………………….82)abnormalconditions6.ConclusionsandDiscussions97.Appendix10AParallelOutputController[POC]1.Purpose:Thepurposeofthisprojectistodesignandsimulateaparalleloutputcontroller(POC)whichactsanin

3、terfacebetweensystembusandprinter.TheAltera’sMaxplusIIEDAtoolisrecommendedandprovidedforsimulation.PleaserefertoWilliamStalling’s“ComputerOrganizationandArchitecture,DesigningforPerformance”,P.65~75;P.185~190.2.Tasks:POCisoneofthemostcommonI/Omodules,

4、namelytheparalleloutputcontroller.Itplaystheroleofaninterfacebetweenthecomputersystembusandtheperipheral(suchasaprinterorotheroutputdevices).Figure1showstheconnectingofaprintertothesystembusthroughthePOC.ThecommunicationbetweenPOCandtheprinteriscontro

5、lledbya“handshake”protocolillustratedinFigure2.Thehandshakingprocessisdescribedasfollows:Whentheprinterisreadytoreceiveacharacter,itholdsRDY=1.ThePOCmustthenholdacharacteratPD(paralleldata)portandproduceapulseattheterminalTR(transferrequest).Theprinte

6、rwillchangeRDYto0,takethecharacteratPDandholdtheRDYat0untilthecharacterhasbeenprinted(e.g.5or10ms),thensetRDY=1againwhenitisreadytoreceivethenextcharacter.(Supposetheprinterhasonlyaonecharacter“buffer”register,sothateachcharactermustbeprintedbeforethe

7、nextcharacterissent).3.Top-LevelStructure:Figure3TheoverallconnectionofthesimulatedprinterandPOCexpressedinthetopmoduleform·Components:NameExplanationprinterasimulatedprinterwhichhasbeensimplified.POCTheparalleloutputcontroller.1)printerFigure4Theinte

8、gratedblockofprinterFigure5Theinternalcircuitofthesimulatedprintermodule2)POCFigure6TheintegratedblockofPOC·Inputs:NameExplanationclkThesystemclockforPOCandprinter.resetThesignaltorestartPOCandprinter.Inthisexperiment,reset=’1’meansPOCandprint