Question

When a J-K flip-flop is constructed from an SR flip-flop

a) S = JQ, R = K+JQ

b) J = S, K = R

c) J = SR'Q, K = S'(R+Q)

d) S = JQ', R = KQ

Comments

I think option b is right J=S and K=R

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No its d

Answer 1

D) S=JQ', R=KQ

To eliminate racing condition when S=1 & R=1, we connect S=JQ' & R=KQ

Comments

its (d)

we can use flip-flop conversion technique also.

steps:

1.write the characterstics table of target FF(J-K here)

2.using the transition of output in characterstic table of J-K write the excitation table of S-R

3.using k-map, express S & R in terms of J & K