Microsoft Word - Digital Logic Design v_4_6a

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9.7. Arithmetic Logic Unit (ALU) Design


The Arithmetic Logic Unit (ALU) is the heart of the computational capability of a computer.


A typically ALU Block Diagram (74LS382) is shown below:


S2 S1 S0 Output: F and CO
0 0 0 Clear
0 0 1 B minus A
0 1 0 A minus B
0 1 1 A plus B
1 0 0 A XOR B
1 0 1 A or B
1 1 0 A and B
1 1 1 PRESET

A


B


CI M


S1


CO


F


ALU


3


3


3


S2 S0

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