




已阅读5页,还剩3页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
1TheworkprincipleoftheMemory1.ThestructureoftheMemoryTheMemoryisusedtodepositthedata.Itistomakeuseofhighandlowevenelectricitytodepositthedata,andthatistosay,itsdepositingdataisanelectricityevenandhighandlow,notthe1234suchasarithmeticfigure,then,ourriddleundone.Socomputerisnotmysterioustoo.AMemorylookslikesomesmalldrawers,thereareeightsmallblanksinasmalldrawer,everysmallblankisusedtodeposittheelectriccharge,theelectricchargespreadstocomeinorreleasepassingtheelectricwirethatconnectwitheachother,astotheelectricchargehowtoplaceinthesmallblank,weneednotworried.Youcanthinktheelectricwireaswaterpipe.Theelectricchargeintheblankiswater.Thatiseasytocomprehend.Thesmalldrawerinsavingeachoneinthemachineisaplacethatputsthedata,wecallitasaUnit.Wecanstartdepositingthedata.Ifyouwanttoputintoafigure12,thatis00001100,weaslongassaveNo.2andNo.3smallblankinfullelectriccharge,butothersmallelectricchargeintheblanktorelease.Buttheproblemcomesout,Memorycontainalotofunits,thelineistoparallel.Whenyouputtheelectricintoablank,youwillputtheelectricchargeintoallunits,andwhenyoureleasetheelectriccharge,youwillputallelectricchargeineveryunit.SohowmanyunitstheMemoryhave,youcanputthesamepiece,thisofcourseisnotwhatwehope,therefore,weneedmakesomevarietiesontheconstructionslightly.Everyunithasacontrolline,Iwanttoputthedataintowhichunit,thecontrollinethatgiveasignalinthisunit.Thiscontrollineopentheswitch,likethis,electricchargecanthenfluxfree,andtheotherunitcontrollineshavenothesignal,sotheswitchdonotopen,cantsufferfromtheinfluence,likethis,thecontrollinethatonlycontrolthedifferentunit,canwriteintoeachunitthedifferentdata.Thesameas,ifwanttotakethedatainacertainunit,andalsoaslongasopenthehomogeneouscontroltheswitchline.2.TheMemorytranslatesthecodeHowwecometocontroltheeveryunitcontrollingline?Acontrolforreturningremarkably,eachunitdollarlineleadstheoutsideoftheintegratedcircuitnotline?Affaircandontbesosimple,one27512have65536unitsinMemory,haveeachlinethederivationto,thisintegratedcircuitmustmorethan60,000feet?Notline,howdo?2Wantingtheviewpointreducesthelinearquantity.Wehaveakindofmethodtocallthisastotranslatethecode,thesimpleintroductionisonce:Canalinerepresent2kindsofappearances,can2linesrepresent4kindsofappearances,can3linesrepresenthowmanykinds,256kindsofappearancesneedagainhowmanylinesrepresent?8kinds?8lines?Soweneed16linestorepresent65536kindsofappearances.3.TheMemorysenablechipandtheconceptofthebusTothis,translatetheproblemofthecoderesolved,letuscomeagaintopayattentiontoanotherproblem.Sendingintoeightlinesofeachunitistousefromwhereof?Itisfromthecalculationonboardtoconnecttocomeover,generally,theseeightlinesbesidesconnectingtheMemory,stillconnectothermachinepiece,Likethisproblemcomeout,theseeightlinesisnotaMemoryandacomputerappropriatly,ifalwaysacertainunitconnectinghereeighton-line,notwell,forexamplethissavingmachinenumberintheunitisfirst0FFH,anothersavingmachineis00H,sothislineafterallistobeplacedinthehighelectricityeven,stilllowelectricityeven?Whowillbeharmful?Sowewanttoletthemseparate.Thewayiseasycertainly,thelinethatbetheoutsidereceivestheintegratedcircuitleadsthefeetaftercomingin,dontreceivedirectlyeachunitgoto,addingonemoresetofswitchinthecenterline.Usuallywestepasidethepassopens,iffacesreallythisissavingtowriteinthedatainthemachine,orwanttoreadadatafromtheMemory,thenstepasidethepassconnecttheline.Thisswitchfromthreefuseschoice:Readingthecontrolcarry,writesthecontrolcarriestochoosetocarrywiththeslice.Wanttowriteinthedataintoasliceofinside,pickoutfirstthatchip,thensendouttowritealetterthenumber,switchmatchthetop,combiningwillspreadtocomeoverofthedata(electriccharge)writesinaninside.Ifread,pickoutfirstthatsliceof,thensendouttoreadtheletterthenumber,theswitchmatchesthetop,datawassentouttogoto.Readdifferentfromwritingaletterthenumbertostillconnecttotheanothertosavethemachineatthesametime,butbecausetheslicechoosesdifferently,althoughreadorwritealetterthenumber,havenothechipenablesignal,soanotherMemorycantmisunderstandopenthedoor,resultintheclash.Sowouldthedifferenthourpickouttwochips?Aslongasistodesignthesystemcant,donotisourpersontocontrolbutbecontrolledbycomputer,ifreallytheemergenceappearstopickouttwochipscircumstancesatthesametime,thatistherowthatelectriccircuitbreakdown,thisisnot3inourdiscussion.Fromtheintroductionabovewehaveseen,theeightlinesusedtodeliverthedataandarenotspecial-used,butalotofcomponentsarepublic-used.Sowecallitasthedatatotalline,bynameBUSinEnglishintotalline,totalnamelybusway。Whocanwalk.And16addresseslineistobeconnectedtogether,callitastheaddresstotalline.4.Thesemi-conductorMemorysclassificationAccordingtoitsfunction,theMemorycanbedividedintoreadandreadrandomMemorytwomajortype.So-calledacontentsforreading,fromthetypefacecomprehensioniscanonlywithfrominsidereading,cantwritinginto,itsimilarlyinourbook,hairarrivingourreturningafter,ourcanreadinginside,mustnotchangethecontentsonthebookasonespleases.AnEnglishforreadingsavingmachineabbreviationisROM(READONLYMEMORY).Memoryso-calledrandomaccess,canrewriteatanytimenamely,thedatathatalsocanreadtheinside,itissimilarinourblackboard,Icanwriteatanytimethethinggoesup,alsocanwipetorewritewiththeblackboard.SavingtheEnglishabbreviationofthemachineaswiththemachineRAM(READRANDOMMEMORY)thesetwokindsofsavingmachinesEnglishabbreviationmustkeepinmind.Attention:theso-calledreadtopointwithrandomaccessallthetimeofnormalworkcircumstancedescendingandspeech,andalsoisatusingthethispieceofsavingthemachine,nottimetopointtomakethispieceofchip.Otherwise,readthesavingdatainthemachinetohowcomeof?Infact,thistruthisveryeasytocomprehend,thebookgetsholdofourhandistocantchange,canbeitstillwhitepaperinininoriginalmaterialoftime,wasprintedbyprintingpressupcertainly.5.ExplaintheotherafewandfamiliarconceptsbythewayPROM,callitastheprogrammableROM.Thisislikeourexercisebook,buyofthetimeisblank,canwritethethinggoup,canoncewriteup,wipedtodonotdrop,soitcanusetowriteonce,ifwritemistake,submitanexpenseaccount.EPROM,callitasthattheultravioletraywipestheprogrammablethatdividedbyreadsthesavingmachine.Itinsideofaftercontentswritegoup,iffeeldissatisfied,canrewriteafterthrowingawaywithakindofspecialmethod,thisistousestheultravioletrayirradiation,ultravioletrayelephantthewordofworksproperly,canthrowawaytheword,thenrewrite.Certainlythenumberoftimesaremany,andalsoineffectivelight,so4anumberoftimesforcanwipedividedbyisalsoalimitedseveral100times.FLASHROM,callitasthethingthatsavethemachinesoon,itissimilarwiththeEPROM,writingupcanalsowipeofftorewrite,butitwanttheconveniencethesome,donotneedthelightshoneon,aslongasusethescienceofelectricitymethodandthencanwipetodividedby,sotheconvenienceismany,andthelifeistooverylong.(Severaltenthousandarriveseveraldonotwait100,000times)Emphasizeagain,thethingsherewriteareallnotatthenormalworkterm.WhetheritisaPROM,EPROMorFLASHROM,theirwritingallhasspeciallimits.Generally,weuseakindofcalledasprogrammablecontrollertodothiswork.Oncepackedtotheworkposition,youwontrewriteliterally.6.Inaddition,todescribetheSingle-chipmicrocomputer8051sconfiguration8051filmshaveROM(Procedurememory,onlytime)andRam(datamemory,couldwritereadable)categories,whichareseparatememoryaddressspace,andgeneralcomputermemoryallocationmethodisthesame.Usuallyonlyonegeneralcomputeraddressspace,ROMandRamthatcanbearbitrarilyplacedinthecontextofadifferentaddressspace,ROMandRamaddressesinaleaguewithdifferentaddressesinthedistributionspace.CPUvisitstheROM,acorrespondenceaddressonlyMemorymodulecanbeROM,andcanalsobeRam,andasimilarvisitdirective.8051intheMemorystructureisdividedintophysicalprocessesmemoryspacean
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 慢行系统贯通工程可行性研究报告(模板范文)
- 粮油仓储储备项目实施方案(模板范文)
- 老旧停车场智能化改造实施方案(范文)
- 家医上门服务的全方位实施方案
- 工厂建设项目风险管理与控制方案
- 天津市滨海新区田家炳中学2023-2024学年高一上学期期中政治题 含解析
- 神木职业技术学院《控制性详细规划》2023-2024学年第二学期期末试卷
- 湘潭医卫职业技术学院《离散数学(全英文)》2023-2024学年第二学期期末试卷
- 贵州工贸职业学院《建筑设备安装技术》2023-2024学年第二学期期末试卷
- 酒泉职业技术学院《兽医外科学及外科手术学》2023-2024学年第二学期期末试卷
- 世界环境日环保教育班会 课件
- 临床诊疗指南-疼痛学分册
- 旧房改造施工设计方案
- 2024年山东职业学院高职单招语文历年参考题库含答案解析
- 2024认定实际施工人法律风险防范与合同完善服务合同3篇
- 2025年度会计人员继续教育会计法律法规答题活动测试100题答案
- 农贸批发市场管理制度(3篇)
- 2022年新高考全国Ⅱ卷英语高考真题试卷(含详解)
- 《糖尿病监测及意义》课件
- 4.1.2-元素周期表-课件 高一上学期化学人教版(2019)必修第一册
- 跨学科实践活动5基于碳中和理念设计低碳行动方案(教学课件)九年级化学上册(人教版2024)
评论
0/150
提交评论