lab01.docx

lab01.docx

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lab01

Lab1:

Creatinga12x8MACUsingtheSystemGeneratorforDSP

TargetingtheSpartan-3EStarterKit

Creatinga12x8MACUsingthe

XilinxSystemGenerator

Introduction

Inthislab,youwillcreatea12-bitx8-bitMAC（MultiplierAccumulator）withamultiplierandanaccumulatorusingSystemGeneratorforDsP,andestimatetheresourceutilizationusingtheResourceEstimatorblockoftheSystemGenerator.TheSystemGeneratorallowsyoutouseblocksthatrepresentXilinxLogiCOREs.AfterdesignandverificationinthesoftwareenvironmentofSystemGenerator,youwillgenerateVHDLcodeandcoresfromthisdesign,andimplementtheMACintheXilinxISE8.2（ProjectNavigator）softwareenvironment

Note:

Thereisacompletedexampleinc:

\xup\dsp_flow\labsolutions\lab1.

Objectives

Aftercompletingthislab,youwillbeableto:

∙HandlethebasicsofSimulink

∙UnderstandthebasicsofbuildingadesigninSystemGenerator

∙SimulateadesigninSystemGenerator

∙RuntheSystemGeneratortokentogenerateVHDLcode

∙RundesignsthroughtheSystemGeneratordesignflow

∙EstimatetheresourcesusingResourceEstimator

∙ImplementthedesigninXilinxISE8softwareenvironmentandgenerateabitstreamfile

DesignDescription

UseSystemGeneratorunderSimulinkenvironmentrunningunderMATLABtocreatea12x8MAC:

∙Multiplierinputdatawidthsof12bitsand8bitsofsigneddata

∙Multiplieroutputwidthof20bits

∙Accumulatoroutputwidthof27-bits

Procedure

Thislabcomprisesnineprimarysteps:

thefirstfourstepsintroduceyoutoSystemGeneratorandthenextfivestepsguideyouthroughhowtocreateadesignstartingfromSystemGenerator,andfinally,implementthedesignusingtheXilinxISE8softwareenvironment.YouwillbeintroducedtoSimulinkinstep1,andtheXilinxblocksetinstep2.Instep3,youwillevaluatetheprecision,and,instep4,youwillanalyzetheeffectofthesampleperiodupontheoutput.Step5requiresyoutodesigna12x8MACcoreusingtheSystemGeneratorsoftwareenvironment,andstep6requiresyoutoestimatetheresourcesusingtheResourceEstimatorblock.Instep7,youwillsimulatethedesigninSimulink,andinstep8youwillgeneratetheVHDLcoreusingtheSystemGeneratorblock.Instep9,youwillimplementthedesignusingtheXilinxISE8softwareenvironment.Beloweachgeneralinstructionforagivenprocedure,youwillfindaccompanyingstep-by-stepdirectionsandillustratedfiguresprovidingmoredetailforperformingthegeneralinstruction.Ifyoufeelconfidentaboutaspecificinstruction,feelfreetoskipthestep-by-stepdirectionsandmoveontothenextgeneralinstructionintheprocedure.

Note:

Ifyouareunabletocompletethelabatthistime,youcandownloadthelabfilesforthismodulefromtheXilinxUniversityProgramsiteat

Foreachprocedurewithinaprimarystep,therearegeneralinstructions（indicatedbythe

symbol）.Thesegeneralinstructionsonlyprovideabroadoutlineforperformingtheprocedure.Belowthesegeneralinstructions,youwillfindaccompanyingstep-by-stepdirectionsandillustratedfiguresthatprovidemoredetailforperformingtheprocedure.Ifyoufeelconfidentaboutcompletingaprocedure,youcanskipthestep-by-stepdirectionsandmoveontothenextgeneralinstruction.

IntroductiontoSimulinkStep1

GeneralFlowforthisLab:

Step4:

Designa12x8MAC

Step3:

AnalyzePrecisionandSampleRate

Step2:

IntroduceXilinxBlocks

Step1:

IntroductiontoSimulink

Step5:

Simulatea12x8MAC

Step7:

CodeGeneration

Step6:

ResourceEstimation

BecomefamiliarwiththeMATLAB,Simulinkenvironments（softwaretoolsfromTheMathWorks）andtheXilinxblocksetrunningundertheSimulinkenvironment.Createablankworksheet,addSineWavesourceelement,addScopesinkelement,andwirethemupasshowninFigure1-1.

Figure1–1.DoublePrecisionDesign.

❶OpentheMATLABcommandwindowbydouble-clickingtheMATLABicononyourdesktop,orgotoStartMenuProgramsMATLAB7MATLAB7

Figure1-2.MATLABIcon.

❷Changedirectorytoc:

\xup\dsp_flow\labs\lab1\:

Typecdc:

\xup\dsp_flow\labs\lab1\inthecommandwindow

Youmaynavigatetoproductdirectoriesbytypinga“cd”commandintheMATLABcommandwindow.Type“ls”toseethedirectorycontents.ManyUNIXshellcommandsworkfromtheMATLABcommandWindow

❸LaunchSimulink:

TypesimulinkattheMATLABcommandprompt;oropentheSimulinkLibraryBrowserbyclickingthecorrespondingbuttonontheMATLABtoolbar

Figure1–3.SimulinkLibraryBrowser.

❹LookattheblocksavailableintheSimulinkLibraryBrowser.Thefollowingelements,amongothers,shouldappear:

∙Simulink（sourcesandsinks）

∙SignalProcessingBlockset

∙XilinxBlockset

∙XilinxReferenceBlockset

Figure1–4.SimulinkLibraryBrowser.

❺Right-clickanyblockinthelibrarybrowser,andchooseHelpfromtheMATLABmenu

Figure1–5.ChooseHelp.

Note:

Thisprovidesdetailsabouttheblock.YoucanalsouseHelpwiththeXilinxBlocksetelements

❻Createa“newmodel”blanksheetbyclickingtheCreateanewmodelbuttonoftheSimulinkLibraryBrowser

Figure1–6.CreateNewModel.

❼Inthelibrarybrowserwindow,expandtheSimulinkLibrary,andclickSources

❽AddtheSineWavesourceontheworksheet:

ScrollthroughthelibrarytofindtheSineWavesource,leftclickSineWave,anddragitontotheworksheet

❾AddtheScopesinkelementandwireittotheSineWavesourceontheworksheet:

FromSimulinkSimulinkSinks,addtheScopeblock,anddrawawirefromtheSineWavetotheScopeblock

Note:

Todrawawire,left-clicksourceanddragmousetodestination

Figure1–7.WiretheElements.

Assign2*pi*（1/150）frequencytotheSineWaveelement,showportdatatypes,andchangesimulationparameter’sstoptimetoinf（infinity）

❶Double-clicktheSineWaveblock

TheBlockParametersdialogboxopens.

❷Changethefrequencyto2*pi*（1/150）andclickOKtoclosethedialogbox

Figure13–8.ChangetheFrequency.

❸Ontheworksheet,gotoFormatPort/SignalDisplaysandclickPortDataTypes

Thesignalwidthisdisplayedonthewireasshowninthefollowingfigure.

Figure1–9.DoublePrecision.

❹Fromyourprojectsheet,pulldowntheSimulationmenuandselectConfigurationParameters

❺FromtheSimulationParametersdialogbox,selectSolverinthelefthandwindowandchangethestoptimetoinf,andclickOK

Thisallowsyoursimulationtoruntoinfinity（untilyoumanuallystopthesimulation）.

Figure1–10.SimulationParametersDialogBox.

ParameterizetheScopeblock,andrunthesimulation

❶Double-clicktheScopeblock

❷ClicktheScopeParametersbutton

Figure13–11.ScopeParametersButton.

❸IntheScopeParametersbox,setthetimerangeto500,andclickOK

❹Runthesimulation:

FromyourSimulinkprojectworksheet,clickStartSimulationbutton,oruseSimulationStart

Figure1–12.SimulationButton.

❺OntheScopedisplay,clicktheAutoscalebuttonsotheoutputwillfitintotheScope

Figure1–13.AutoscaleButton.

❻ViewtheScopeoutput

Asmoothsinewaveshouldfitintoyourscopewindow.Thisiswhatyouwouldexpectbecauseyouarerunningadouble-precisionsoftwaresimulation.

❼Stopthesimulationasshownbelow

Figure1–14.StopSimulation.

IntroducetheXilinxGatewaysandMUXBlocksStep2

Step4:

Designa12x8MAC

Step3:

AnalyzePrecisionandSampleRate

Step2:

IntroduceXilinxBlocks

Step1:

IntroductiontoSimulink

Step5:

Simulatea12x8MAC

Step7:

CodeGeneration

Step6:

ResourceEstimation

UsetheXilinxGatewayIn,GatewayOut,SystemGenerator,andMUXblocks,asshownbelow,whichprovideinterfacetotheXilinxBlocksetsinSimulink.

Figure1–15.GatewayInandOut.

❶UsingSimulationConfigurationParametersdialogbox,setthestoptimeto500,andclickOK

❷FromtheXilinxBlockset（intheSimulinkLibraryBrowser）,openBasicElementsanddragtheGatewayInblockontothedesignsheet.DropitontheconnectionbetweentheSineWaveandtheoutputScope.Itwillautomaticallyinsertitself

❸Double-clickGatewayIntoopentheBlockParameters,andsettheNumberofbitsto8andBinaryPointto2

❹VerifythatQuantizationissettoround,andoverflowtosaturate.

❺Similarly,dragaGatewayOutblockontothesheet,anddropitbetweentheGatewayInblockandtheoutputScopeblock

Figure1–16.DragGatewayInBlock.

❻AddaSimulinkMUXbetweentheGatewayOutandtheScopebyusingSimulinkSignalRouting（seeFigure1-15）

❼AddanadditionalnetbetweentheSineWaveandtheMUX

Note:

Thiswillmakethescopedisplayboththedouble-precisionsinewaveandtheuser-definedprecisionsinewavethathasgoneintoandbackoutoftheXilinxgateways

❽Addasystemgeneratortoken

fromtheXilinxBlocksetBasicElementslibrarytothedesign

❾ToviewthenumberofsignalsgoingintotheMUX,selectWidenonscalarlines,Signaldimensions,andPortdatatypesundertheFormatPort/SignalDisplaysmenu

Figure1–17.FormatMenu.

❿Updatethediagram:

selectEditUpdateDiagram

Note:

Nowlookatyourporttypes.Noticethatthegatewayinblockhaschangedthesignalsfromdouble-precisiontofixed-pointtypes.Fixed-pointlookslikeFix_8_2inthiscase.

AnalyzePrecisionandSampleRateStep3

Step4:

Designa12x8MAC

Step3:

AnalyzePrecisionandSampleRate

Step2:

IntroduceXilinxBlocks

Step1:

IntroductiontoSimulink

Step5:

Simulatea12x8MAC

Step6:

ResourceEstimation

Step7:

CodeGeneration

Runthesimulationwithdefaultsettingsandunderstandtheoutput.Changethedatatypeands