This problem is from my textbook chapter review question, and it seems a lot different from the example provided by textbook, so I have no idea what to do.
I even have solution manual for this, but still, I'm totally lost.
I set don't care condition as d(0,1,2,13,14,15).
Textbook solution is: w(A,B,C,D)=m(11,12) x(A,B,C,D)=m(7,8,9,10) y(A,B,C,D)=m(5,6,9,10) z(A,B,C,D)=m(4,6,8,10,12)
Please help me how to get those min-terms based on what method. Some min-terms are selected when both excess-3 and binary both have the value of 0. (especially on 'w')
Only one thing I can figure out is how to get the min-terms for 'z' which is z(A,B,C,D)=m(4,6,8,10,12) where I can just place 1 in k-map followed by the value of the last digit on excess-3 table