# Homework Help: 8:1 MUX of two equations.

1. Oct 23, 2008

### MagLok

1. The problem statement, all variables and given/known data
F1 = AB + AC + BC
F2 = (A + C’ + D’)(B + C + D)(A + B’ + C)

2) Draw the 8-to-1 MUX implementation of F1 and F2; show your work.

I understand doing a 4:1 of one function, but how do you do an 8:1 with two functions?

2. Oct 23, 2008

### rootX

put three select signals at the top: A,B,C
F1 would take only 1,0s for each output
and for F2, you would need some of inputs in terms of D

3. Oct 23, 2008

### MagLok

Alright, let me try it and see. the method that I've used for 4:1 is draw the k-map (2 rows, 4 columns) and then derive the mux from that, is this a similar method? I'm assuming so and that's what I'll try again. Thanks for the quick response by the way.

-Mikael

4. Oct 24, 2008

### MagLok

Alright, here's what I got and I'm pretty sure it's wrong (see the note..the MUX I drew is essentially the MUX for F2, and I'm not sure about what to do with the final value relationship between F1(4) and F1(7)