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Synchronous Counter Mod-12 Up/Down Exercise

  1. Jun 14, 2016 #1
    1. The problem statement, all variables and given/known data
    "Design a Synchronous Counter Mod-12 Up/Down, using only Flip-Flop Type D. A binary input ##U## that determines if the counter has to increase (##U = 1##) or decrease (##U = 0##).

    2. Relevant equations
    Flip-Flop Type D equation is
    ##Q_{t + 1} = D##

    3. The attempt at a solution
    I have done already this type of exercise but without the Up/Down. How should it be now? Do I have to add a column ##U## when I write the table? Like for example:
    ##q_3 q_2 q_1 q_0 | q_3' q_2' q_1' q_0' | D_3 D_2 D_1 D_0 | U##
    ##0 0 0 0 | 0 0 0 1 | 0 0 0 1 | -##
    ##0 0 0 1 | 0 0 1 0 | 0 0 1 0 | -##
    etc.
    And in that column, when do I have to write ##1## and when ##0## since it is up to the one that uses the counter? Or I write all "don't care" in the column? But wouldn't that be pointless?
     
  2. jcsd
  3. Jun 15, 2016 #2

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    You could easily find some online help with this .

    A search on the obvious ' Up down counter with D flip flops ' returns a lot of useful information .

    Please come back if you still have problems .
     
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