help with asynchronous counter

Discussion in 'Homework Help' started by Totally Jesus, May 28, 2009.

  1. Totally Jesus

    Thread Starter New Member

    May 28, 2009
    For part of an exam tomorrow i need to build a 3 bit asynchronous counter that counts from 1 to 6 and uses d flip flops with positive edge trigger and active low set and reset. I think i can build the d flip flop counter, but how do i make it so it goes from 1 to 6, and leaves out 000 and 111?
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    I'm guessing you know you will need 3 D flip-flops. Write the excitation table (given current and next flip-flop states) for each of the D inputs and reduce to minimum logic using a minimization method of your choice. Implement the minimized logic using gate types of your (or the examiner's) choice.