The parallel full adder used to increment, decrement and subtract

Thread Starter

Jason87

Joined Dec 10, 2009
39
Figure attached uses the full adder whose inputs are defined as A and B. Given two external 3 bit registers X and Y i must use a truth table to show how the functions increment, (X+1), decrement, (X - 1) and subtract (X - Y) are obtained, together with add, (X + Y), using the adder under the control of signals s0 and s1? Any possible help?
 

Attachments

beenthere

Joined Apr 20, 2004
15,819
What is the nature of the help you are looking for? Do you not understand binary arithmetic? Or do you not understand how to construct a truth table?
 
Top