Consider the 4-to-1 multiplexer shown below. What values must inputs A, B, C, D be so that the multiplexer implements the function

Question

I am completing some practice quizzes online in preperation for a uni exam next week, and I am a bit stumped as to how to solve this problem:

Consider the 4-to-1 multiplexer shown below. What values must inputs A, B, C, D be so that the multiplexer implements the function

If anyone would'nt mind giving me a few tips as to how to solve this, I would much appreciate it.

Thanks Corey

The last function element is unreadable. `X=s1*~s0+s0*?` – xvan Mar 19 '16 at 02:04 — xvan, Mar 19 '16 at 02:04

score 1 · Answer 1 · answered Mar 19 '16 at 02:16

I'll assume: X = S1 * ~S0 + S0 * ~S1 as your posted picture is unreadable.

First you need to know the multiplexor transfer:

Then, apply the function to all your possible input combinations.

f(s1,s0)=S1*~S0+~S1*S0

f(0,0) = 0
f(0,1) = 1
f(1,0) = 1
f(1,1) = 0

And finally fill the table with X=f(s1,s0)

S1 S0 X  f(s1,s0)
 0  0 A  0
 0  1 B  1
 1  0 D  1
 1  1 C  0

1 Answers1