Problem to draw a two level 4x1 MUX

Discussion in 'Homework Help' started by nori90, Mar 21, 2011.

  1. nori90

    Thread Starter New Member

    Mar 21, 2011
    Hello Everyone,

    I have
    4 Inputs A,B,C,D and outputs is high for (0,3,6,9,12).

    I found the truth table and I now have to plot a two level of 4x1 MUX

    I have trouble to do it :0

    I know how to do it using only one MUX but now I am really struggling

    Thanks for your answer and help

  2. Georacer


    Nov 25, 2009
    I take it you will use 2 4x1 MUXs for the first level and another 2x1 MUX for the final selection.

    Break your truth table in rows of 8. That will result in 2 separate tables. Use only the columns B,C and D to produce a partial solution of the problem. That way you will have a result that is valid only if A=0 and another that stands when A=1.

    Use the 2x1 MUX controlled by the input A to filter the two results. Presto! You have your result.