5.Asynchronous sequential circuit becomes unstable when the next state(s) changes
repeatedly without settling to a stable state in a finite time.
6.There can be a race condition. It occurs when two or more states, which are the in-
puts after the delay, changes the states in a cycle. For example, x
q
,
and x
q
inputs,
which are the outputs of the latches or delay elements after a transition cycle, change
to 10 from 01 or change from 10 to 11 and then to 01 due to the different amount of
delays for obtaining x
q
,
and x
q
¢ in any two transitions. Note: It is natural that two cir-
cuits can rarely be having exactly identical propagation ...
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