Engineering Using a SR flip-flop to make a particular circuit

[bdh2991]

Homework Statement

A Null-Lobur flip-flop (NL flip-flop) behaves as follows: If N = 0, the flip-flop does not change state. If N = 1, the next state of the flip-flop is equal to the value of L.

a) Derive the characteristic table for the NL flip-flop.

b) show how an SR flip-flop can be converted to a NL flip-flop by adding gate(s) and inverter(s).

Homework Equations

The Attempt at a Solution

I believe i got part a right which is:

if N is 0 and L is 0, Q(t+1) = Q(t) -> no change
if N is 0 and L is 1, Q(t+1) = Q(t) -> no change
if N is 1 and L is 0, Q(t+1) = 0 -> L
if N is 1 and L is 1, Q(t+1) = 1 -> LHowever, I really am not sure at all on how to do the second part. My professor hasn't done any examples like this and I had no luck searching through the book. Any help on how to go about doing this other then just guess and check (which would take forever)?

 

[bdh2991]

I think I actually figured it out but using a JK flip flop rather than only an SR flip- flop...

Not sure how to fix the undefined issue with 1 - 1 going into the SR without using the JK...any suggestions?