# Question regaring karnaugh map...

Discussion in 'General Electronics Chat' started by karnough, Aug 4, 2009.

1. ### karnough Thread Starter New Member

Aug 4, 2009
2
0
Hi,

Let's assume we have a 4x4 karnaugh map and all of the cells are marked with don't care sign.
Is this map equails to "1" or to "0"?
Can I choose all the don't care cells to be as "1" and then circle them all?

10x.

2. ### bearing01 Member

Jul 29, 2009
14
0
Yes, don't care's (X) can be considered "1" or "0", whatever makes the most convenient or largest circle/group.

3. ### karnough Thread Starter New Member

Aug 4, 2009
2
0
but, I'm asking about particular karnaugh map which all the cells are don't care. Does the equation is 1 or 0?

4. ### count_volta Active Member

Feb 4, 2009
435
24
Why would an entire map be don't cares? What possible use could that have? It can be EITHER 1 or 0 whichever you want.

But it would be silly. The function would be like, f(A,B,C,D) = 0 or f(A,B,C,D) = 1. What is the use of such a function for anything?

5. ### t06afre AAC Fanatic!

May 11, 2009
5,939
1,222
It is like you flip a coin and it fall down on egde

6. ### bearing01 Member

Jul 29, 2009
14
0
If you got a k-map with all don't cares that means you don't have any logic or decision table to reduce. You get a 1 output with any input.