计算机组成与设计硬件软件接口--课后习题答案

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1、PartII:SolutionsGuide52InstructorsManualforComputerOrganizationandDesign1Solutions1.1q1.2u1.3f1.4a1.5c1.6d1.7i1.8k1.9j1.10o1.11w1.12p1.13n1.14r1.15y1.16s1.17l1.18g1.19x1.20z1.21t1.22b1.23h1.24m1.25e1.26v1.27j1.28b1.29f1.30j1.31i1.32ePartII:SolutionsGuide531.33d1.34g1

2、.35c1.36g1.37d1.38c1.39j1.40b1.41f1.42h1.43a1.44a111minutesseconds1.45Timefor---revolution=---rev´-----------------------------------´60-----------------------=5.56ms225400revminute111minutessecondsTimefor---revolution=---rev´-----------------------------------´60---

3、--------------------=4.17ms227200revminute1.46Asdiscussedinsection1.4,diecostsriseveryfastwithincreasingdiearea.Con-siderawaferwithalargenumberofdefects.Itisquitelikelythatifthedieareaisverysmall,somedieswillescapewithnodefects.Ontheotherhand,ifthedieareaisverylarge,

4、itmightbelikelythateverydiehasoneormoredefects.Ingeneral,then,dieareagreatlyaffectsyield(astheequationsonpage48indicate),andsowewouldexpectthatdiesfromwaferBwouldcostmuchmorethandiesfromwaferA.1.47ThedieareaofthePentiumprocessorinFigure1.16is91mm2anditcontainsabout3.

5、3milliontransistors,orroughly36,000persquaremillimeter.Ifweassumetheperiodhasanareaofroughly.1mm2,itwouldcontain3500transistors(thisiscertainlyaveryroughestimate).SimilarcalculationswithregardtoFigure1.26andtheIntel4004resultin191transistorspersquaremillimeterorrough

6、ly19transistors.1.48WecanwriteDiesperwafer=f((Diearea)–1)andYield=f((Diearea)–2)andthusCostperdie=f((Diearea)3).Moreformally,wecanwrite:CostperwaferCostperdie=----------------------------------------------------------Diesperwafer´yieldWaferareaDiesperwafer=----------

7、-------------------Diearea1Yield=--------------------------------------------------------------------------------------------()1+Defectperarea´Diearea2¤21.49Nosolutionprovided.1.50FromthecaptioninFigure1.16wehave198diesat100%yield.Ifthedefectdensityis1persquarecentim

8、eter,thentheyieldisapproximatedby1/((1+1´.91/2)2)=.47.Thus198´.47=93dieswithacostof$1000/93=$10.75perdie.1.51Defectsperarea.54Instr