What is race around condition?
Ans:
Race Around Condition:-
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Jn
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Kn
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Q(n+1) output
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0
1
0
1
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0
0
1
1
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Q(n)
1
0
Q(n)'
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|
|
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In JK flip-flop, while J=k=1 then output will be the complement of the earlier state. Assume the output Qn is 0 and clock pulse is high. After ?t that is the time interval, is equivalent to the propagation delay throughout two NAND gates the output will change to the Qn+1=1 (if there is J=K=1). There we have=K=1 and Q=1 and after the other ?t interval the output, Q will change to 0 from 1. Therefore after every ?t duration of the output will flip in between 0 and 1. At the ending of the clock pulse the value of Q is uncertain since the value of ?t is not identified exactly. Such situation is termed as race around situation.