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Homework Help: Digital circuit function

  1. Sep 26, 2009 #1
    1. The problem statement, all variables and given/known data
    given the midterm function:
    f= m1 + m2 + m3 + m6 + m7 + m10 + m13

    -supposed to simplify this function

    2. Relevant equations


    3. The attempt at a solution
    i got the following functions using Karnaugh mapping:
    f = [tex]\overline{x_{1}} \cdot \overline{x_{2}}[/tex] + [tex]\overline{x_{1}} \cdot x_{3}[/tex] + [tex]x_{1} \cdot x_{2} \cdot \overline{x_{3}}\cdot x_{4}[/tex] + [tex]\overline{x_{4}}\cdot x_{3}}[/tex]

    I tested it out by hand and it seemed fine to me, once i entered into Quartus and simulated a functional wave, m2 and m13 did not come out to 1 like it's supposed to.

    Verlog code i used:
    Code (Text):

    module design_1 (x1,x2,x3,x4,f);
        input x1, x2, x3, x4;
        output f;
        assign f =(~x1 | ~x2 | ~x3 | x4) & (~x1 | ~x2 | x3 | ~x4) &
        (~x1 | ~x2 | x3 | x4) & (~x1 | x2 | x3 | ~x4) & (~x1 | x2 | x3 | x4) &
        (x1 | ~x2 | x3 | ~x4) & (x1 | x2 | ~x3 | x4);
    can someone please tell me where i went wrong?

    any help would be appreciated
    thanks in advanced,
    Last edited: Sep 27, 2009
  2. jcsd
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