# Presentation on ILU

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Design

Published on April 11, 2014

Source: slideshare.net

Group - P Integer and Logic Unit by 8

Integer and Logic Unit  Used for Integer and Logic Operations on Microprocessor  In our project: 1. Arithmetic- Addition and Multiplication 2. Logic- OR and AND  Addition using Carry Save Adder Issue- 3 inputs  Multiplication using Booth Multiplier High speed 2Seer Akademi (2011-13)

What is ALU? • ALU stands for: Arithmetic Logic Unit. ALU is a digital circuit that performs Arithmetic (Add, Sub . . .) and Logical (AND, OR, NOT) operations. • John Von Neumann proposed the ALU in 1945 when he was working on EDVAC. 3Seer Akademi (2011-13)

Interaction with Other Units Seer Akademi (2011-13) 6

Carry Save Adder: • The basic CSA (carry save adder) is similar to the full adder but the architecture is different. • The operation and the principle of CSA is based on formulae A + B + C= SUM+2*CARRY SUM=(A+B+C)mod2 and COUNT=((A+B+C)- SUM)/2) • For example if we add three numbers X=0101,Y=0011,Z=0100. • Sum=0010 and Saved Carry= 1010 was calculated in CSA and next in the carry look adder/ ripple carry adder the output new sum= 1100 and here new carry is 0. 7Seer Akademi (2011-13)

Booth Multiplier – Operation (step by step) • mr-Multiplier,md-Multiplicand • Shift md • 2’s Complemet the md • Shift md • Encode the mr • Partial product generation by addiing shifting bits of md bits with respect to mr bits • Final 3 stages of partial product generated bits are added in end Seer Akademi (2011-13) 9

10 OR & AND INPUT A B OUTPU T A + B 0 0 0 0 1 1 1 0 1 1 1 1 INPUT OUTPU T A B A AND B 0 0 0 0 1 0 1 0 0 1 1 1 Seer Akademi (2011-13)

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