Mealy Machine -

• In a Mealy machine, the outputs are a function of the present state and the value of the inputs as shown in the figure 1.
• Accordingly, the outputs may change asynchronously in response to any change in the inputs.

Moore machine -

• In a Moore machine the outputs depend only on the present state as shown in the figure 2.
• A combinational logic block maps the inputs and the current state into the necessary flip-flop inputs to store the appropriate next state just like Mealy machine.
• However, the outputs are computed by a combinational logic block whose inputs are only the flip-flops state outputs.
• The outputs change synchronously with the state transition triggered by the active clock edge.