It is a sequential circuit consisting of a combinational circuit, a storage element, and a feedback path from output to the input. Change in FSM state from one state to another is called transition.
FSM are of two types:
1. Mealy Machine: Output is a function of the current state and the applied input.
2. Moore Machine: Output is a function of the current state only.
State Diagram: It describes the behavior of a finite state machine.
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