GATE1987-14a

Question

The state transition given below is realized by a clocked JK flip-flop

state transition

$Q_{n}$	$Q_{b+1}$
0	0
0	1
1	0
1	1

The JK input to realize the transition is:

(A) 

JK

0$\emptyset$

1$\emptyset$

$\emptyset$1

$\emptyset$0

(B)

JK

$\emptyset$0

$\emptyset$1

1$\emptyset$

0$\emptyset$

(C)

JK

0$\emptyset$

$\emptyset$0

$\emptyset$1

1$\emptyset$

(D)

JK

1$\emptyset$

$\emptyset$0

0$\emptyset$

$\emptyset$1

Answer 1

Privious output Q_n and next output Q_n+1 , we have to find what input present at J and K. 

Qn	Qn+1	J	k	j	k
0	0	0	0,1	0	x
0	1	1	0,1	1	x
1	0	0,1	1	x	1
1	1	0,1	0	x	0

A is answer.