Carry Look Ahead Adder VHDL Code

4 bit carry look ahead adder vhdl

Carry Look Ahead Adder is fastest adder compared Ripple carry Adder. For the Purpose of carry Propagation, Carry look Ahead Adder construct Partial Full Adder, Propagation and generation Carry block. It avoid Carry propagation through each adder.

In order to implement Carry Look Ahead Adder, first implement Partial Full Adder and then Carry logic using Propagation and generation Block.