Carry look ahead logic

Carry lookahead logic is implemented to make the binary adder more efficient.Instead of waiting for the carry to propagate from C0 to Cn in a n-bit adder, this method computes them all simultaneously.The downside is that the hardware complexity increases. (Carry look ahead is implemented by the 3 AND and 3 OR gates in the center of the circuit, obviously for this 2-bit adder). About the circuit: •The 2-bit numbers to be added, from top to Bottom: B1 B0 A1 A0 •The top Led is C2 mid led is S1 bottom led S0 The logic switch at the bottom is C0 the initial carry. C: carry , S:Sum

published 5 years ago