Question about binary counter with jk flip-flops

[James889]

Hi,

Let's say i want to make a binary counter using jk-flip-flops that counts 1,3,5,7,1...

Then i'd use the excitation table for the jk-flip-flop to determine the next state.

The next step would be to use karnaugh-maps to minimize the j and k columns.

My question is: Do i need to record, in the karnaugh-maps, when j or k is zero or only when they are at logic 1 ?

 

[jerin_007]

you won't get zero for both j and k.. You will have either "zero" or "one" or "dont care(X)"..
So therefore you can record k-map according to i/p's.. I hope you know, that we can pair,quad,octal "1" with "X".

 

[James889]

you won't get zero for both j and k.. You will have either "zero" or "one" or "dont care(X)"..
So therefore you can record k-map according to i/p's.. I hope you know, that we can pair,quad,octal "1" with "X".

Hi,

So if one column for either J or K turn out to have only don't care or zero, i can just ignore it?

 

[jerin_007]

You will get a 1 at some point for sure.. Try solving one problem!
I haven't encountered having only 0 or X situation.