Re: FullAdder imp.

Posted by notzy on May 13, 2021; 6:35pm
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/FullAdder-imp-tp4025675p4035997.html

Hey there, I don't understand how we can logically deduce that an Or gate is needed to connect the two carries.

This is the truth table, but I have no clue why this connects the two HalfAdder and the output carry. Can somebody explain?

 c1 | c2 | Or 
 0  | 0  | 0
 0  | 1  | 1
 1  | 0  | 1
 1  | 1  | 1