FIGURE 15.2(a) Synchronous sequential circuit in which the memory section undergoes change of state only at the discrete
clock instances (b) Asynchronous sequential circuit in has the memory state changes at undefined instances and output is de-
pendent on sequences of the inputs (c) Synchronous Clocked sequential circuit [Note: Memory section with the identical clock
instances at each flip-flop].
15.2.2Asynchronous Sequential Circuits
Asynchronous sequential circuit is a circuit in which not only the present inputs X and
present state Q but also the sequences of changes affect the output Y. The changes can be at
the undefined instances ...
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