I haven't done EE for quite a long time. I need to implement some MUX, so I started with a two-way MUX. But I don't understand how to make the decision:
A truth table will show that
This truth table shows that when S=0 then Z=A but when S=1 then Z=B.
I don't get the logic here. The boolean expression is Z = (A and S') or (B and S)
Let S = 0, then each sub expression will become
z1
A = 0, S' = 1 => 0
A = 1, S' = 1 => 1
z2
B = 0, S = 0 => 0
B = 1, S = 0 => 0
Can someone please explain to me how do we reach that conclusion? Thank you very much!