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Arithmatic Logic Unit
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Design of ALU :

 

ALU or Arithmatic Logical Unit is a digital circuit to do arithmatic operations like addition, subtraction,division, multiplication and logical oparations like and, or, xor, nand, nor etc. A simple block diagram of a 4 bit ALU for operations and,or,xor and Add is shown here :

 

The 4-bit ALU block is combined using 4 1-bit ALU block

 

 

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