EmbeddedSystemDesign《嵌入式系统设计》课后答案(英文版)(13)

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=150,000,000*1.58748

=6,360,000,000,000,000

1.23Explainwhysingle-purposeprocessors(hardware)andgeneral-purposeprocessorsare

essentiallythesame,andthendescribehowtheydifferintermsofdesignmetrics.

Singlepurposeprocessorandgeneral-purposeprocessorsareessentiallythesameintermsofadesigner'sjob.Withthematurationofdesigntools,bothdesignersstartwithwritingsequentialprograms.Dependingonwhetherthedesigner'sgoalisasinglepurposeprocessororageneral-purposeprocessor,thesynthesistoolwouldthenproducegatesormachineinstructions.Hardwareexcelsinperformance,sizeandpowerconsumption.Softwareenablesflexibility,lowNREcost,andrapidproductdevelopment.

1.24Whatisa“renaissanceengineer,”andwhyisitsoimportantinthecurrentmarket?

Itisadesignerwhoiscomfortableandfamiliarwithvarioustechnologies.Specifically,itisadesignerwhoknowsboththesoftwareandhardwaredesignaspectsinvolvedinproductdevelopment.Forthebestoptimizationofsystemsadesignermustbeabletomovefunctionalitybetweenhardwareandsoftwareatanystageindevelopment.

1.25Whatisthedesigngap?

Thedesigngapistheinabilityfordesignerproductivitytokeeppacewithchipcapacitygrowth.

1.26Computetherateatwhichthedesignproductivitygapisgrowingperyear.Whatisthe

implicationofthisgrowinggap?

Basedonquestion1.21wehavedeterminedthattheannualICgrowthrateis1.587andtheannualdesignerproductivitygrowthrateis1.205.

yo=startyear

y=endyear

designgap(y)=1.587(y-yo)-1.205(y-yo)

Thedesigngapisnotasimplelinearfunction.Thegapincreasesaseachyeargoesby.Thismeansthateachyearthedesignersareabletouseasmallerandsmallerpercentageoftransistorsavailable.

1.27Definewhatismeantbythe“mythicalman-month.”

EmbeddedSystemDesign11

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