Fetch-Execute Cycle Fetch the next instruction Decode Execute It.

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Presentation transcript:

Fetch-Execute Cycle Fetch the next instruction Decode Execute It

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR PC MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR PC 2000 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 1 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2000 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 1 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2002 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 1 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2002 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 1 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2002 MBR 100A CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator FETCH 1

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2002 MBR 100A CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 1 DECODE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2002 MBR 100A CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator DECODE Instruction Decoded 1

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2002 MBR 100A CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 1

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2002 PC 2002 MBR CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 2 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2002 PC 2004 MBR CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 2 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2002 PC 2004 MBR CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 2 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2002 PC 2004 MBR 8019 CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator FETCH 2

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2002 PC 2004 MBR 8019 CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 2 DECODE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 2000 PC 2004 MBR 8019 CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator DECODE Instruction Decoded 2

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A00 001B00 001C00 MAR 0019 PC 2004 MBR 0A CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 2

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 0019 PC 2004 MBR 0A CIR Op-CodeOperand ACC 0A ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 2 EXECUTE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2004 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 3 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2006 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 3 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2006 MBR CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 3 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2006 MBR 1005 CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator FETCH 3

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2006 MBR 1005 CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 3 DECODE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2006 MBR 1005 CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator DECODE Instruction Decoded 3

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2004 PC 2006 MBR 1005 CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 3

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2006 PC 2006 MBR CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 4 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2006 PC 2008 MBR CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 4 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2006 PC 2008 MBR CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 4 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2006 PC 2008 MBR 4019 CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator FETCH 4

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2006 PC 2008 MBR 4019 CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 4 DECODE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2006 PC 2008 MBR 4019 CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator DECODE Instruction Decoded 4

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 019 PC 2008 MBR CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 4

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 019 PC 2008 MBR CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 4

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 019 PC 2008 MBR 0A CIR Op-CodeOperand ACC 05 ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 4

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 019 PC 2008 MBR 0A CIR Op-CodeOperand ACC ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 4 0A + 05 = 0F

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 019 PC 2008 MBR 0A CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator EXECUTE 4

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2008 PC 2008 MBR CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 5 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2008 PC 2010 MBR CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 5 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2008 PC 2010 MBR CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 5 FETCH

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2008 PC 2010 MBR 801A CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator FETCH 5

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2008 PC 2010 MBR 801A CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 5 DECODE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 2008 PC 2010 MBR 801A CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator DECODE Instruction Decoded 5

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A00 001B00 001C00 MAR 001A PC 2010 MBR 0F CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 5 EXECUTE

Instruction Memory A (LOAD #10) (STORE 25) (LOAD #05) (ADD 25) A (STORE 26) Data Memory A 001A0F 001B00 001C00 MAR 001A PC 2010 MBR 0F CIR Op-CodeOperand ACC 0F ALU PCProgram Counter MARMemory Address Register MBRMemory Buffer Register CIRCurrent Instruction Register ALUArithmetic and Logic Unit ACCAccumulator 5 EXECUTE