1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Generaly when designing mealy or moore ckts when to pick which?

  1. Mar 26, 2007 #1
    1. The problem statement, all variables and given/known data

    Not really a HW question but say we follow the steps in converting a state diagram down to its excitation table - how do we determine whether the best ckt implementation would be best implemented with either a mealy or a moore system

    2. Relevant equations

    mealy :
    state equation : Q = f(present state, current inputs)
    output equation: Z = h(present state, current inputs)

    Moore :
    state eqaution : Q = f(present state, current inputs)
    output equation: Z = h(present state)


    3. The attempt at a solution

    1) granted we 're given a function for a truth table
    f(A,B,C,D...,etc) = logic function

    2) we convert it into a state / excitation table depending on the kind of flip flops we want to use

    Code (Text):

    D flip flop:

    q  Q | D
    0..0    0  
    0  1    1
    1  0    0
    1  1    1

    not Q = C' . d + Q.D
    or Q = D

    T flip flops

    q  Q | T
    0  0    0
    0  1    1
    1  0    1
    1  1    0

    Q = Tq' + T'q

    J/K flip flops

    q Q | J  K
    0 0    0 x
    0 1    1 x
    1 0    x 1
    1 1    x 0

    let x = don't care values

    Q = Jq' + K'q
     
     
    Last edited: Mar 26, 2007
  2. jcsd
  3. Mar 27, 2007 #2

    berkeman

    User Avatar

    Staff: Mentor

    I generally use the Moore structure, and I think it is the more commonly used. I think you would only use the Mealy structure if you needed to propagate input changes through the structure a clock earlier than you get with the Moore.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Generaly when designing mealy or moore ckts when to pick which?
  1. MEALY and MOORE (Replies: 1)

  2. Moore Machine Design (Replies: 0)

Loading...