command protocol operations initializing alu for risc by: ricardo maurosa wilfredo soto félix...

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ALU For RISC

By:

Ricardo Maurosa

Wilfredo Soto

Félix RiveraElectrical/Computer EngineeringDecember 15th, 2004

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Outline

Description – What is an ALU? – OperationsALU for RISC – Design – Functionality & Timing DiagramsConclusionsReferences

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Description

What is an ALU?ALU

– Arithmetic Logic Unit– Devices connected in series

– AND, OR, NAND, NOT

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Description

Operations– Arithmetic – ADD, ADC, SUB, NEG,

INC3– Logic – AND, OR, NOT, SHR,

SHRA, SHL, SHC– Others – C = B

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ALU For RISCDesign

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Inside the ALU

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Ripple Full Adder

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Arithmetic Functions

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Logic Functions

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A B C

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B C

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A B C

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Conclusion

– Understanding the behavior and functionality of the ALU

– Components inside the ALU– Different dataflow for operations– 1, 2 or 3 Buses differences

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References

V.P. Heuring and H.F. Jordan, “ Computer Systems Design and Architecture”, Second Edition, USA, Prentice-Hall; 2004.

“Wikipedia: The Free Enciclopedia”, URL http://en.wikipedia.org/wiki/ALU

“Logic Gates”, URL http://www.kpsec.freeuk.com/gates.htm