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What is race around condition?
Ans:
Race Around Condition:-
Jn
Kn
Q(n+1) output
0
1
Q(n)
Q(n)'
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.
It happens when two or more processes are reading or writing some joint data and the final result depends on who runs exactly when.
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