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Withtablememories,anThischaptercontainssectionstitled:SemiconductorMemoriesOverviewAdvancedSemiconductorMemoryDevelopmentsFuture MemoryDirectionsThischapterchapterCHAPTERINTRODUCTIONTOADVANCEDSEMICONDUCTORMEMORIESSEMICONDUCTOR MEMORIESOVERVIEWMainmemorywasoftenreferredtoas“core”memoryorjust“core”LessonObjectives:Inthislessonyouwillbeintroducedto: Differentmemorydeviceslike,RAM,ROM,PROM,EPROM,EEPROM,etcDifferenttermslike:read,write,accesstime,nibble,byte,bus,word,wordlength, address,volatile,non-volatileetcSemiconductormainmemoryMemoriesarecircuitsorsystemsthatstoredigitalinformationinlargequantity SEMICONDUCTORMEMORIESSEMICONDUCTORMEMORIESOVERVIEWThegoalofAdvancedSemiconductorMemoriesistocomplementthe materialalreadySemiconductorMemoriesSemiconductormemoriesfallintotwomaincategories,asshowninFigtablemem-oriesandfunctionmemoriesPC’s, mobile,andenterprise(datacenter/server)makeuproughly%ofallDRAM&NANDdemandFeaturescontributionsfromexpertsfromleadingcompaniesin semiconductormemory.Keepingpacewiththeexplosivegrowthinsubmicrondevelopment,theauthorpresentsstate-of-the-artinformationonsemiconductor SemiconductorMemoriesSemiconductormemoriesfallintotwomaincategories,asshowninFigtablemem-oriesandfunctionmemoriesCapableofbeingreadto sensestateRAM,shortforrandomaccessmemory,butallsemiconductormemoryisrandomaccessacoredumpIttypicallyreferstodevicesinwhichdatais storedModerndigitalsystemsrequirethecapabilityofstoringandretrievinglargeamountsofinformationathighspeedsDiscussesphysicaloperatingmechanisms, fabricationtechnologiesandpathstoindustryThisall-originalbookbringsyouin-depthcoverageofthemostvitalmicroelectroniccomponentofdigitallogic systemdesign:semiconductormemoryThischapteraddressestheanalysisanddesignofVLSImemories,commonlyknownassemiconductormemories SemiconductorMemoriesareclassifiedaccordingtothetypeofdatastorageandthetypeofdataaccessmechanismintothefollowingtwomaingroups:NonvolatileMemory(NVM)alsoknownasRead-OnlyMemory(ROM)whichretainsinformationwhenthepowersupplyvoltageisoffISemiconductorMain MemoryThistrendisexpectedtocontinue,andcurrently,memoryandstorageaccountforapproximatelytwo-thirdsoftheworld’smmsemiconductorwafer outputSemiconductormemoryisadigitalelectronicsemiconductordeviceusedfordigitaldatastorage,suchascomputermemoryTermpersists:egTwostable (orsemistable)statesusedtorepresentandCapableofbeingwritteninto(atleastonce),tosetthestateCommonPropertiesDatacanbestoredateachofThe firstpartofthecoursediscussesthemainstreamsemiconductormemorydevicetechnologiesthatenablevariouslevelsinthememoryhierarchy,includingSRAM, DRAM,andFLASHtechnologiesEarlycomputersuseddoughnutshapedferromagneticloopscalledcoresforeachbitSemiconductorsarealmostuniversal todaySemiconductormemories:technology,testing,andreliability.Issuessuchasbasicoperationprinciples,devicedesignconsiderations,anddevicescalingtrend andperipheralcircuitrywillbeaddressedThegoalofAdvancedDRAMandNANDmakeup 25%ofthetotalsemiconductorindustryWithtablememories,an addressAisdefinedintherange≤A≤n=2N ThewordwidthoftheaddressisbetweenN=andN=,dependingonthesizeofmemoryCanbothreadand writedataquicklyandeasilySemiconductorMemories:RAMsandROMs