In a RS flip-flop the input R=S=1 leads to an indeterminate output. The RS flip-flop circuit may be re-joined if both inputs are 1 than also the outputs are complement of each other as shown in characteristics table below.

Truth Table for JK flip-flop

Input

Output

Clk

J

K

Q

Q^’

0

X

X

Previous or Memory State

1

1

0

1

0

1

0

1

0

1

1

0

0

Previous or Memory State

1

1

1

Toggle State