lab04.docx

lab04.docx

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lab04

Lab4:

LookingUndertheHood

TargetingXUPSpartan-3E

LookingUndertheHood

Introduction

Inthislab,youwillgaininsightintothecostsofvarioussystemabstractions,suchassaturationarithmetic,rounding,andadditionallatency.ThislabmakesuseoftheXilinxSystemGenerator’sresourceEstimatorblocktoestimatethehardwareresourcesusageineachabstractionscaseandViewRTLSchematicvieweravailableinXSTtoviewthefunctionaldesign.

Note:

Therearecompletedexamplesinc:

\xup\dsp_flow\labs\lab4\lab4_soln.

Objectives

Aftercompletingthislab,youwillbeableto:

∙Understandtheeffectofquantizationandoverflowparameters

∙Understandtheimplicationsofsaturationarithmeticandrounding

∙UsetheResourceEstimatorblocktoestimatetheresourceutilization

∙ViewtheresultsofyourdecisionsinanRTLviewer

DesignDescription

Thedesignisasimpleaddsubblockforwhichyouwillmodifysystemparametersontheaddsub（xladdsub）blockandobservetheeffectonthegeneratedhardware.

Figure4-1.SystemGeneratoraddsubDesignforHardwareComparison

Procedure

Thislabcomprisessixprimarysteps.YouwillusetheprovideddesigninSimulinkandestimatetheresourcesusingtheResourceEstimatorblockinStep1.UsingtheSystemGeneratorblock,youwillgeneratethedesigninStep2.InStep3,thedesignisimplementedandthepost-mapreportisutilizedtoestimatetheresources.Thisstepillustratesdifferentwaystodeterminetheresourceutilization.Steps4through6requireyoutochangetheoverflowandquantizationcharacteristics,implementthedesign,andunderstandtheimplicationinhardwareusingtheXSTViewRTLSchematicviewerofXilinxISE6.Beloweachgeneralinstructionforagivenprocedure,youwillfindaccompanyingstep-by-stepdirectionsandillustratedfiguresprovidingmoredetailforperformingthegeneralinstruction.Ifyoufeelconfidentaboutaspecificinstruction,feelfreetoskipthestep-by-stepdirectionsandmoveontothenextgeneralinstructionintheprocedure.

Note:

Ifyouareunabletocompletethelabatthistime,youcandownloadthelabfilesforthismodulefromtheXilinxUniversityProgramsiteat

EstimateResourcesUsingResourceEstimatorStep1

GeneralFlowforthisLab:

Step4:

ModifyOverflow

Step3:

ImplementDesign

Step2:

GeneratetheDesign

Step1:

EstimateResources

Step5:

ModifyQuantization

Step6:

ModifyQuantizationandOvervlow

Opentheaddsub.mdlmodelinMATLABandaddtheResourceEstimatorblockfromXilinxBlocksetIndex.Double-clicktheaddsubblockandclicktheUsePlacementInformationforCorecheckbox.Double-clicktheresourceEstimatorblockandclicktheEstimateAreabutton

❶OpentheMATLABcommandwindowbydouble-clickingtheMATLABicononyourdesktop,orgotoStartMenuProgramsMATLAB7.0MATLAB7.0

❷Changedirectorytoc:

/xup/dsp_flow/labs/lab4/:

Typecdc:

/xup/dsp_flow/labs/lab4/inthecommandwindow

❸Opentheaddsub.mdl

Note:

Theaddsub.mdldesignhastruncateforthequantizationandwrapforoverflow

❹Double-clicktheAddSubblocktoopentheparametersblock

❺MakesuretheUsecoreplacementinformationcheckboxisUnchecked

Figure4-2.TheAddSubblockParameters.

❻Double-clicktheResourceEstimatorblock

❼SelectEstimatefromthedrop-downboxandclicktheEstimatebutton

Figure16-3.EstimateResourcesUsingtheEstimateAreaButton.

1.Whatistheresourceutilizationestimate?

NumberofSlices:

NumberofLUTs:

NumberofIOBs:

GeneratetheDesign“AsIs”togetaBaselineStep2

GeneralFlowforthisLab:

Step4:

ModifyOverflow

Step3:

ImplementDesign

Step2:

GeneratetheDesign

Step1:

EstimateResources

Step5:

ModifyQuantization

Step6:

ModifyQuantizationandOvervlow

UsingtheSystemGeneratorblock,generatethebaselinedesignwiththefollowingsettings

∙Compilation:

HDLNetlist

∙ProductFamily:

Spartan-3Exc3s500e-4fg320

∙TargetDirectory:

/run1

∙SynthesisTool:

XST

❶Double-clicktheSystemGeneratorblock

❷Browsetothecurrentdirectory（c:

/xup/dsp_flow/labs/lab4/）astheTargetDirectory

❸SetthedevicerelatedfieldsaslistedbelowandclicktheGeneratebutton

∙Compilation:

HDLNetlist

∙ProductFamily:

Spartan3exc3s500e-4fg320

∙TargetDirectory:

/run1

∙SynthesisTool:

XST

ViewRTLSchematicandEstimateResourcesStep3

GeneralFlowforthisLab:

Step4:

ModifyOverflow

Step3:

ImplementDesign

Step2:

GeneratetheDesign

Step1:

EstimateResources

Step5:

ModifyQuantization

Step6:

ModifyQuantizationandOvervlow

Opentheaddsub_cw.iseprojectintheXilinxISE8environment.Synthesizeandimplementthedesignusingthedefaultsettings.ViewthesynthesizeddesignusingtheXSTViewRTLSchematicviewer.

❶Opentheaddsub_cw.iseprojectinXilinxISE8fromc:

\xup\dsp_flow\labs\lab4\run1

❷Selectaddsub_cw.vhdintheSourcesinProjectwindow

❸Double-clickViewRTLSchematicunderSynthesis

❹Highlightthetop-levelblockandclickthePushbuttoninthetopmenutopushdownintothehierarchytoviewaddsub_x_0

❺Reviewtheschematicandclosetheviewer

FromSimulinkwindow,estimatetheresourcesusingpost-mapreportoftheimplementeddesign

❶Double-clicktheResourceEstimatorblockintheSimulinkdesignwindow

❷SelectthePost-MapandclicktheEstimatebutton,whichwillrunimplementationinthebackground

❸Theresourcesarecomputedusingthepost-mapreport

2.Whatisthepost-mapresourceutilizationestimate?

NumberofSlices:

NumberofLUTs:

ModifytheOverflowCharacteristicStep4

GeneralFlowforthisLab:

Step4:

ModifyOverflow

Step3:

ImplementDesign

Step2:

GeneratetheDesign

Step1:

EstimateResources

Step5:

ModifyQuantization

Step6:

ModifyQuantizationandOvervlow

Changetheaddsubblockparameter’soverflowpropertiestoSaturationarithmetic.GeneratetheVHDLcodeandimplementthedesign.ViewthesynthesizeddesignusingtheXSTViewRTLSchematicviewer,anddeterminetheresourcesusingPost-Mapreport.

❶Double-clicktheaddsubblockintheSystemGeneratormodel

❷IntheOutputTypetab,selectSaturateforOverflow,andthensimulate

❸Changethetargetdirectorytorun2andregeneratethedesign

❹Openaddsub_cw.iseinrun2andselectaddsub_cw.vhdintheSourcesinProjectwindowintheXilinxISE8

❺OpendownSynthesizeintheProcessesforCurrentSourceanddouble-clickViewRTLSchematic

❻Understandtheschematicandclosetheviewer

3.WhatdoyouobserveintheRTLview?

❼Usepost-mapreporttoestimatetheresources

4.Whatisthepost-mapresourceutilizationestimate?

NumberofSlices:

NumberofLUTs:

❽Closetheproject

ModifytheQuantizationCharacteristicStep5

GeneralFlowforthisLab:

Step4:

ModifyOverflow

Step3:

ImplementDesign

Step2:

GeneratetheDesign

Step1:

EstimateResources

Step5:

ModifyQuantization

Step6:

ModifyQuantizationandOvervlow

Changebacktheaddsubblockparameter’sOverflowpropertiestoWrapandselecttheQuantizationtoRounding.GeneratetheVHDLcodeandimplementthedesign.ViewthesynthesizeddesignusingtheXSTViewRTLSchematicviewer.

❶Double-clicktheaddsubblockintheSystemGeneratormodel

❷IntheOutputTypetab,setOverflowtoWrapandQuantizationtoRound,andthensimulate.

❸Changethetargetdirectorytorun3andregeneratethedesign:

ClickGenerate

❹Opentheaddsub_clk_wrapper.iseprojectintheXilinxISE8

❺Selectaddsub_clk_wrapper.vhdintheSourcesinProjectwindow

❻OpendownSynthesizeintheProcessesforCurrentSourceandclicktheViewRTLSchematic

❼Understandtheschematicandclosetheviewer

5.WhatdoyouobserveintheRTLview?

❾UsetheResourceEstimatortogeneratethepost-maparea

6.Whatisthepost-mapresourceutilization?

NumberofSlices:

❿Closetheproject

ModifytheQuantizationandOverflowCharacteristicsStep6

GeneralFlowforthisLab:

Step4:

ModifyOverflow

Step3:

ImplementDesign

Step2:

GeneratetheDesign

Step1:

EstimateResources

Step6:

ModifyQuantizationandOvervlow

Step5:

ModifyQuantization

Changetheaddsubblockparameter’sOverflowpropertiestoSaturationandQuantizationtoRounding.GeneratetheVHDLcodeandimplementthedesign.ViewthesynthesizeddesignusingtheXSTViewRTLSchematicviewer.

❶Double-clicktheaddsubblockintheSystemGeneratormodel

❷IntheOutputTypetab,selectSaturateforOverflowandRoundforQuantization

❸Changethetargetdirectorytorun4Regeneratethedesign

❹Opentheaddsub_cw.iseprojectintheXilinxISE8

❺Selectaddsub_cw.vhdintheSourcesinProjectwindow

❻OpendownSynthesizeintheProcessesforCurrentSourceandclickViewRTLSchematic

❼Understandtheschematicandclosetheviewer

7.WhatdoyouobserveintheRTLview?

❽DeterminetheresourceutilizationwiththeResourceEstimator

8.Whatisthepost-mapresourceutilization?

NumberofSlices:

❾Closetheproject

Conclusion

Inthislab,youlearnedwhatquantizationandoverflowparametersdo.YouwereabletoestimatetheresourceutilizationusingtheResourceEstimatorblock.Youalsoobservedtheimplicationsofsaturationarithmeticandroundinginthehardware.Additionally,youwerefamiliarizedwiththeXSTViewRTLSchematicViewer.

Answers

1.Whatistheresourceutilizationestimate?

NumberofSlices:

5

NumberofLUTs:

10

NumberofIOBs:

29

TheRTLviewofthebaselinedesignshowsthatnoadditionalhardwareisrequiredonthe