Designing a down counter 22-15

Discussion in 'Homework Help' started by t4ll0n3, Oct 7, 2013.

  1. t4ll0n3

    Thread Starter New Member

    Oct 7, 2013
    I am working on designing a down counter with active low jk flip flops in multisim that displays an output from 22-15(22,21,20,19,18,17,16,15). I have built my down counter and I have set my circuit to reset when it hits 14. What I am struggling with is how to set the upper limit of 22 so that my counter cycles from 22 down to 15. I know it has to do with the set similarly to how I set the reset but I cannot remember how to go about it. I have attached a picture of my multisim file. What steps do I need to take to take to eliminate 31-23? Thanks for the help.
  2. WBahn


    Mar 31, 2012
    Perhaps you should first consider what it means to "reset" the counter when it hits 14 that way that you do? What does it reset to? What do you want it to reset to?

    Also, you should not leave unused inputs to logic chips unconnected. Your simulator may be forgiving, the real world is not.