Difference between the Mealy machine and the Moore machine
| Parameters | Mealy Machine | Moore Machine |
|---|---|---|
| Definition | Changes its output based on the present state and current input. | Output depends only on the current state, not on the current input. |
| Output | Places output on the transition. | Also places output on the transition. |
| States | Has comparatively fewer or the same states as the Moore machine. | Has comparatively fewer or the same states as the Mealy machine. |
| Value of Output Function | The output function becomes a function of transitions and changes when input logic is done in the present state. | The output function’s value becomes a function of the current state along with changes at the edges of the clock when a state change occurs. |
| Reaction to Inputs | Reacts comparatively faster to inputs, usually in the same clock cycle. | Requires more logic for decoding output, resulting in more delays in the circuit. Typically reacts after one clock cycle. |
| State and Output | The asynchronous generation of output through its state alters to synchronous on the present clock. | Both state and output change synchronously with its clock edge. |
| Requirement of States | Generally requires only a very few states for the process of synthesis. | Requires more states for synthesis compared to Mealy machine. |
| Requirement of Hardware | Requires very little hardware for designing. | Requires more hardware for designing. |
| Counter | Cannot be referred to as a Mealy Machine. | Can be referred to as a Moore Machine. |
| Design | The designing process may not be very easy. | The designing process is relatively easy. |
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