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Cse675.02.F.ALUDesign_part1

Cse675.02.F.ALUDesign_part1 - CSE 675.02 Introduction to...

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1 Arithmetic / Logic Unit – ALU Design Presentation F CSE 675.02: Introduction to Computer Architecture Slides by Gojko Babi ± Reading Assignment: B5, 3.4 g. babic Presentation F 2 ALU Control 32 32 32 Result A B 32-bit ALU • Our ALU should be able to perform functions: – logical and function – logical or function – arithmetic add function – arithmetic subtract function – arithmetic slt ( set-less-then ) function – logical nor function • ALU control lines define a function to be performed on A and B. 32-bit ALU Zero Overflow Carry out
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2 g. babic Presentation F 3 Functioning of 32-bit ALU ALU Control 32 32 32 Result A B 32-bit ALU Zero Overflow Carry out ALU Control lines Result lines provide result of the chosen function applied to values of A and B Since this ALU operates on 32-bit operands, it is called 32-bit ALU • Zero output indicates if all Result lines have value 0 Overflow indicates integer overflow of add and subtract functions; for unsigned integers, this overflow indicator does not provide any useful information Carry out indicates carry out and unsigned integer overflow 4
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