Like this will get the final output sequence (S4 S3 S2 S1) = (1 1 1 1) and Output carry C4 = 0. Here the important point is the second stage full adder gets input carry i.e., C1 which is the output carry of initial stage full adder. Same like for next input bits A2 and B2, output S2 = 1 and C2 = 0.As per this equation, for 1st full adder S1 =1 and Carry output i.e., C1=0.As per its theory, the output equation for the Sum = A1⊕B1⊕Cin and Carry = A1B1⊕B1Cin⊕CinA1 Sum (S1) and carry (C1) will be generated as per the Sum and Carry equations of this adder.When Ao & Bo are applied at 1st full adder along with input carry 0.As per this adder concept, input carry is 0.These are representing the A4 A3 A2 A1 and B4 B3 B2 B1. Let’s take an example of two input sequences 01.4-bit RCA Diagram Working of 4-bit Ripple Carry Adder
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