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For realisation of JK flip-flop from SR flip-flop, if J=0 & K=0 then the input is ___________(a) S=0, R=0(b) S=0, R=X(c) S=X, R=0(d) S=X, R=XThe question was posed to me at a job interview.Origin of the question is Realisation of one Flip-flop using other Flip-flops topic in chapter Flip-Flops of Digital Circuits

Answer»

Right choice is (B) S=0, R=X

Easiest explanation: If J=0 & K=0, the output will be as: Q(n)=0, Q(n+1)=0 and it is fed into both the AND GATES which results as S=0 & R=X(i.e. don’t care).



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