Up/Down Counter using D Flip Flop

Discussion in 'Homework Help' started by circuitme, Nov 10, 2012.

  1. circuitme

    Thread Starter New Member

    Nov 10, 2012
    6
    0
    I am stuck and I can't figure out this circuit

    could anyone please help me by finding the truth table, State Diagram, and Timing Diagram for the pictured circuit in the attachment section?
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    Have you attempted the truth table yourself?

    I'd suggest you start there, instead of asking others for help. Why should I help you when all you've done is take a picture?
     
  3. circuitme

    Thread Starter New Member

    Nov 10, 2012
    6
    0
    well I did make a truth table my self, and I also made k-maps and such but I'm not sure if they are correct, thus the reason for my post. Here I will include all of my work so that maybe you all can feel better about helping me.

    Up-Counter Circuit Truth Table:

    X​
    A​
    B​
    C​
    D​
    Q1​
    Q0​
    0
    0
    0
    0
    1
    0
    0
    0
    0
    1
    1
    0
    0
    1
    0
    1
    0
    1
    1
    1
    0
    0
    1
    1
    0
    0
    1
    1

    Down-Counter Circuit Truth Table:

    X​
    A​
    B​
    C​
    D​
    Q1​
    Q0​
    1
    0
    0
    1
    1
    0
    0
    1
    0
    1
    0
    0
    0
    1
    1
    1
    0
    0
    1
    1
    0
    1
    1
    1
    1
    0
    1
    1

    Inputs and Outputs:

    Pre’
    Clr’
    D
    clk
    Q
    Q’
    0
    1
    X
    X
    1
    0
    1
    0
    X
    X
    0
    1
    0
    0
    X
    X
    1(rising edge)
    1 (rising edge)
    1
    1
    1
    é
    1
    0
    1
    1
    0
    é
    0
    1
    1
    1
    x
    0
    Q0
    Q0’

    also I don't want any snide comments or just plain trollism so if thats your style, take it to some liberal arts forum cause I don't appreciate it. Thanks
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,805
    circuitme likes this.
  5. circuitme

    Thread Starter New Member

    Nov 10, 2012
    6
    0
    ok my fault,I need to learn how to insert tables. More to come
     
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