4bit adder

113

01:10:59

Add two 4 bit numbers (row 1 and 2 of toggles) and get a 4 bit and carry answer (technically 5 bit answer). Note least significant bit is on the right.

published 5 years ago

fatcat2

5 years ago

It would be better if you replace the 2 XOR gates in the carry logic circuitry with 2 OR gates. The circuit complexity will be reduced. K-map solving yields the simplified expression A.B+C(A+B)

jusgif

5 years ago

@fatcat2 how would that work though? 🤔 also would it really be beneficial? I can try tomorrow i guess

jusgif

5 years ago

@fatcat2, i am using 1 of the two xors for the sum part though so... i think that would mean adding an extra component for each adder 🤔

jusgif

5 years ago

Sorry @fatcat2... i disagree with you... Just tried your logic while it works it adds an extra gate which could be avoided with the two xors

fatcat2

5 years ago

You're right. Idk how the expression with XOR gates was made but they are beneficial here.

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