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减少指令执行周期数是RISC计算机性能提高的基础，它是通过 (2) 、指令控制部件 (3) 微代码、 (4) 寄存器、 (5) 寻址方式、限制访问内存来实现的。 (6) 都是与RISC芯片有关的名词。
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减少指令执行周期数是RISC计算机性能提高的基础它是通过17指令控制部件18微代码19寄存器20寻址
增加
减少
适当扩充
任意
减少指令执行周期数是RISC计算机性能提高的基础它是通过7指令控制部件8微代码和9等来实现的
尽可能多用原有
增加
软件固化
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过2指令控制部件3微代码4寄存器5寻址方式限制
增加
减少
精选
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过42指令控制部件43微代码44寄存器4
超长指令字(VLIW)
单指令多功能
精简指令系统
适当扩充指令系统
减少指令执行周期数是RISC计算机性能提高的基础它是通过1指令控制部件2微代码和3等来实现的
减少寄存器
增加寻址方式
限制访问内存
增加通道
减少指令执行周期数是RISC计算机性能提高的基础它是通过17指令控制部件18微代码19寄存器20寻址
增加
减少
精选
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过1指令控制部件2微代码和3等来实现的
尽可能多用原有
增加
软件固化
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过46指令控制部件47微代码和48等来实
尽可能多用原有
增加
软件固化
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过2指令控制部件3微代码4寄存器5寻址方式限制
尽可能多用原有
增加
软件固化
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过42指令控制部件43微代码44寄存器4
尽可能多用原有
增加
软件固化
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过17指令控制部件18微代码19寄存器20寻址
尽可能多用原有
增加
软件固化
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过17指令控制部件18微代码19寄存器20寻址
SPARC和MIPS
SPARC和SCSI
FLOPS和MIPS
MIMD和EISA
减少指令执行周期数是RISC计算机性能提高的基础它是通过2指令控制部件3微代码4寄存器5寻址方式限制
SPARC和MIPS
SPARC和SCSI
FLOPS和MIPS
MIMD和EISA
减少指令执行周期数是RISC计算机性能提高的基础它是通过46指令控制部件47微代码和48等来实
超长指令字
单指令多功能
精简指令系统
适当扩充指令系统
减少指令执行周期数是RISC计算机性能提高的基础它是通过42指令控制部件43微代码44寄存器4
增加
减少
适当扩充
任意
减少指令执行周期数是RISC计算机性能提高的基础它是通过7指令控制部件8微代码和9等来实现的
减少寄存器
增加寻址方式
限制访问内存
增加通道
减少指令执行周期数是RISC计算机性能提高的基础它是通过1指令控制部件2微代码和3等来实现的
超长指令字
单指令多功能
精简指令系统
适当扩充指令系统
减少指令执行周期数是RISC计算机性能提高的基础它是通过7指令控制部件8微代码和9等来实现的
超长指令字
单指令多功能
精简指令系统
适当扩充指令系统
减少指令执行周期数是RISC计算机性能提高的基础它是通过42指令控制部件43微代码44寄存器4
增加
减少
精选
不用
减少指令执行周期数是RISC计算机性能提高的基础它是通过46指令控制部件47微代码和48等来实
减少寄存器
增加寻址方式
限制访问内存
增加通道
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Wehavealreadycoveredthetopicofnetworkaddresses.Thefirst1inablockinclassABandCdefinesthenetworkaddress.InclassesABandCifthehostedisall1stheaddressiscalledadirectbroadcastaddress.Itisusedbya2tosendapackettoallhostsinaspecificnetwork.Allhostswillacceptapackethavingthistypeofdestinationaddress.Notethatthisaddresscanbeusedonlyasa3addressinanIPpacket.NotealsothatthisspecialaddressalsoreducesthenumberifavailablehostedforeachnetidinclassesABandC. InclassesABandCanaddresswithall1sforthenetidandhosted32bitsdefinea4addressinthecurrentnetwork.AhostthatwantstosendamessagetoeveryotherhostscanusethisaddressasdestinationaddressinanIPpacket.Howeverarouterwillblockapackethavingthistypeofaddresstoconfinethebroadcastingtothe5network.NotethatthisaddressbelongstoclassE. 2是
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Thepresentationlayerisconcernedwiththe1andsemanticsoftheinformationexchangedbetweentwosystems.Theprocessesintwosystemsareusuallyexchanginginformationintheformofcharacter2numbersandsoon.Theinformationshouldbechangedtobit3beforebeingtransmitted.Becausedifferentencodingsystemsthepresentationlayerisresponsiblefor4betweenthesedifferentencodingmethods.Thepresentationlayeratthesenderchangestheinformationfromitssender-dependentformatintoacommonformat.Thepresentationlayeratthereceivingmachinechangesthecommonformatintoits5dependentformat. 2是
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Bothbusandtreetopologiesarecharacterizedbytheuseofmultipoint1.Forthebusallstationsattachthroughappropriatehardware2knownasatapdirectlytoalineartransmissionmediumorbus.Full-duplexoperationbetweenthestationandthetapallowsdatatobetransmittedontothebusandreceivedfromthe3.Atransmissionfromanystationpropagatesthelengthofthemediuminbothdirectionsandcanbereceivedbyallother4.Ateachendofthebusisa5whichabsorbsanysignalremovingitfromthebus. 2是
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AtransportlayerprotocolhasseveralresponsibilitiesOneistocreateaprocess-to-processprogram-to-programcommunication;TCPusesport 1toaccomplishthis.Anotherresponsibilityofatransportlayerprotocolistocreatea2anderror-controlmechanismatthetransportlevel.TCPusesasliding3protocoltoachieveflowcontrol.Itusestheacknowledgmentpackettime-outandretransmissiontoachieve 4control.Thetransportlayerisalsoresponsibleforprovidingaconnectionmechanismfortheapplicationprogram.Theapplicationprogramsends5ofdatatothetransportlayer.Itistheresponsibilityofthetransportlayeratthesendingstationtomakeaconnectionwiththereceiver. 1是
For1serviceweneedavirtual-circuitsubnet.Letusseehowthatworks.Theideabehindvirtualcircuitsistoavoidhavingtochooseanew2foreverypacketsent.Insteadwhenaconnectionisestablishedaroutefromthe3machinetothedestinationmachineischosenaspartoftheconnectionsetupandstoredintablesinsidethe4Thatrouteisusedforalltrafficflowingovertheconnectionexactlythesamewaythatthetelephonesystemworks.Whentheconnectionisreleasedthevirtualcircuitisalsoterminated.Withconnection-orientedserviceeachpacketcarriesan5tellingwhichvirtualcircuititbelongsto. 3是
OneofthemainresponsibilitiesofICMPistoreport1.Althoughtechnologyhasproducedincreasinglyreliabletransmissionmediaerrorsstillexistandmustbehandled.IPisan2protocol.ThismeansthaterrorcheckinganderrorcontrolarenotaconcemofIPJCMPwasdesignedinparttocompensateforthisshortcoming.HowerverICMPdoesnot3errorsitsimplyreportsthem.Errorcorrectionislefttothehigher-levelprotocols.Errormessagesarealwayssenttotheoriginal4becausetheonlyinformationavailableinthedatagramabouttherouteisthesourceanddestination1Paddresses.ICMPusesthesourceIPaddresstosendtheerrormassagetothesourceofthe5 3是
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