Conversion of 1 flip flop to another

Thread Starter

lamborg

Joined Nov 16, 2012
2
So I am just learning this stuff and here is something that I don't understand.

While converting 1 ff to another lets say SR to JK, we first draw the table as:

J K | Qn Qn+1 | S R

What I am not understanding is this Qn+1
How do I fill in this Qn+1 forum? It doesn't appear to be adding 1 to Qn, neither it is JKQn +1.

Can someone help me with filling this table? I think then I will be able to figure the Kmap.
 

WBahn

Joined Mar 31, 2012
29,976
So I am just learning this stuff and here is something that I don't understand.

While converting 1 ff to another lets say SR to JK, we first draw the table as:

J K | Qn Qn+1 | S R

What I am not understanding is this Qn+1
How do I fill in this Qn+1 forum? It doesn't appear to be adding 1 to Qn, neither it is JKQn +1.

Can someone help me with filling this table? I think then I will be able to figure the Kmap.
Think of it as

\( Q_n \text{ and } Q_{n+1}\)

Or as

Q(n) and Q(n+1)

In either case, they are referring to the PRESENT value and NEXT value of Q, respectively.

You will often see the notation Q and Q' to mean the same thing. Yes, this can be confusing since Q' is also frequently used to mean NOT(Q). You will learn how to pick the intended meaning from context (and even be right the vast majority of the time!).
 
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