JK Flip Flop help

Thread Starter


Joined Mar 3, 2011
Hey, I'm really new to designing circuits and I'm having a pretty hard time with it. I just pretty much figured out D Flip flops today. Anyway I'm having trouble filling out the transition table for a JK flip flop sequence detector for 0011 without overlapping.

My state diagram is probably incorrect. I understand it but the "without overlapping" part throws me off.
I think I could design the circuit if I could even complete the transition table.

I need to find the input and output equations before I can design the circuit so could someone take a look at what I have now and help me out, I'm really lost in this class.



Joined Nov 25, 2009
You have built a Mealy State Machine, instead of a Moore one. This is a viable option, of course. Just consider the difference between the two.

Your state diagram is correct but incomplete. You must show that your machine will return to the beginning (A) when an incorrect input is inserted. For example, when you are on B and you receive a 1, you should return to A.

Check here for a tutorial on Flip Flop-based FSMs: