Re: Carry Select Adder

Posted by Ashry on Apr 05, 2013; 10:22pm
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/Carry-Select-Adder-tp4025925p4026615.html

Hi u have a great design but there is a mistake in ur design ,
u should use XOR gates instead of OR gates
Ex: try adding 12+15 (using or gates) u have wrong answer
try adding 12+15 (using xor gates ) u will have 27

best wishes ,
Abdallah Ashry