Re: Carry Select Adder

Posted by cadet1620 on Apr 05, 2013; 11:14pm
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/Carry-Select-Adder-tp4025925p4026616.html

Thanks. You are indeed correct that those ORs in the Carry Bypass Adder should be XORs.

I screwed it up when I was cleaning up the circuit for posting. I'll get a corrected version up later today. FWIW, my original Logisim version tapped the XOR(a,b) from the Full Adders but that would have been harder to explain than showing them outside the adders.

--Mark