# Conversion of 1 flip flop to another

Discussion in 'Homework Help' started by lamborg, Nov 16, 2012.

1. ### lamborg Thread Starter New Member

Nov 16, 2012
2
0
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.

2. ### tshuck Well-Known Member

Oct 18, 2012
3,527
679
This may be of some help...

3. ### WBahn Moderator

Mar 31, 2012
23,552
7,207
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!).