How do I solve this problem I encountered on my Multisim JK flip-flop counter?

Thread Starter


Joined Apr 15, 2016
I'm trying to create a 4-12 asynchronous up JK Flip-flop counter for a project. The DCD_HEX display shows random numbers while it's on, and it should show 4-12. I don"t know what is wrong because my set is 4 and my capture is 13 and it is a up counter.



Joined Mar 31, 2012
Can you single step the clock (or provide a real slow clock)? Then monitor all of the signals and see which ones are misbehaving.

How are you initializing the flip flops? Some simulators will initialize them to an "unknown" state (which is different from a random initial state).