The DLX ISA

The DLX ISA - 05-1 05-1 TheDLXISA Coverage...

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Unformatted text preview: 05-1 05-1 TheDLXISA Coverage TextbookSection2.8 Topics DLXGoals DLXInstructionHighlights DLXInstructionCoding SyntheticInstructions(NIB) 05-1 EE4720LectureTransparency.Formatted10:47,31August2001fromlsli05. 05-1 05-2 05-2 DLXDesignConsiderations DLXGoals AtypicalRISCprocessor. Incorporatefeatureswithdemonstratedusefulness. Enablesimple,high-speed,implementation DemonstrationofUsefulnessofFeatures CoveredinChapters1,2. DeterminedbyanalyzingexistingISAs. Someusefulnessillustratedwithgraphs(e.g.,immediatesizes). Lessuseful,itwouldbenice,featuresomitted. 05-2 EE4720LectureTransparency.Formatted10:47,31August2001fromlsli05. 05-2 05-3 05-3 DLXsUsefulFeatures Lotsofgeneralpurposeregisters. Integerandfloating-pointoperands. Basicarithmeticandlogicaloperations. Basicaddressingmodes:register,immediate,displacement. Adequateimmediateanddisplacementsizes. Etc. Simple,High-SpeedImplementation Load-StoreArchitecture:ALUinstructionsdonotaccessmemory. SimpleCoding:uniforminstructionsizes,fewinstructiontypes. WorkBalance:Instructionsdoaboutthesameamountofwork. SeparateintegerandFPregisterfiles. 05-3 EE4720LectureTransparency.Formatted10:47,31August2001fromlsli05. 05-3 05-4 05-4 SimpleCodingAdvantages Simplerandfasterdecodinglogic. Executioncanstartbeforedecodingcomplete. WorkBalanceAdvantages EfficientuseofCPUhardware. Integeroperationsarebalanced. Floating-pointoperationsarenot.(DivisiontakeslongerthanADD.) 05-4 EE4720LectureTransparency.Formatted10:47,31August2001fromlsli05. 05-4 05-5 05-5 SeparateRegisterFileAdvantages Doublethenumberofregisterswithonly1bitperinstruction(inopcode). (Otherwise,1extrabitperoperandwouldbeneeded.)(Otherwise,1extrabitperoperandwouldbeneeded....
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The DLX ISA - 05-1 05-1 TheDLXISA Coverage...

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