Parameters Mealy Machine Moore Machine Definition A Mealy Machine changes its output on the basis of its present state and current input. A Moore Machine’s output depends only on the current state. It does not depend on the current input. Output Mealy Machine places its output on the transition. Moore machine also places its output on the transition. States It has comparatively fewer or the same states as that of the Moore machine. It has comparatively fewer or the same states as that of the Mealy machine. Value of the Output Function When the input logic is done in the present state, then the value of the output function becomes a function of transitions and changes. Whenever a change occurs in the state, the output function’s value becomes the function of its current state along with the changes at the edges of the clock. Reaction to the Inputs A Mealy machine reacts comparatively faster to inputs than the Moore machine. Generally, it reacts in the very same clock cycle. In a Moore Machine, one requires more logic for decoding the output. As a result, it leads to more delays in the circuit. Generally, these react after one clock cycle. State and Output The asynchronous generation of output through its state alters to synchronous on the present clock. The state and output- both change the synchronous to its clock edge. Requirement of States A Mealy Machine generally requires only a very few states for the process of synthesis. The states for synthesis required for this machine are also more. Requirement of Hardware It requires very little hardware for designing a Mealy Machine. One requires more hardware to design a Moore Machine. Counter You cannot refer to the counter as a Mealy Machine. You can refer to the counter as a Moore Machine. Design The designing process doesn’t need to be very easy. It is very easy to design.
| Parameters | Mealy Machine | Moore Machine |
| Definition | A Mealy Machine changes its output on the basis of its present state and current input. | A Moore Machine’s output depends only on the current state. It does not depend on the current input. |
| Output | Mealy Machine places its output on the transition. | Moore machine also places its output on the transition. |
| States | It has comparatively fewer or the same states as that of the Moore machine. | It has comparatively fewer or the same states as that of the Mealy machine. |
| Value of the Output Function | When the input logic is done in the present state, then the value of the output function becomes a function of transitions and changes. | Whenever a change occurs in the state, the output function’s value becomes the function of its current state along with the changes at the edges of the clock. |
| Reaction to the Inputs | A Mealy machine reacts comparatively faster to inputs than the Moore machine. Generally, it reacts in the very same clock cycle. | In a Moore Machine, one requires more logic for decoding the output. As a result, it leads to more delays in the circuit. Generally, these react after one clock cycle. |
| State and Output | The asynchronous generation of output through its state alters to synchronous on the present clock. | The state and output- both change the synchronous to its clock edge. |
| Requirement of States | A Mealy Machine generally requires only a very few states for the process of synthesis. | The states for synthesis required for this machine are also more. |
| Requirement of Hardware | It requires very little hardware for designing a Mealy Machine. | One requires more hardware to design a Moore Machine. |
| Counter | You cannot refer to the counter as a Mealy Machine. | You can refer to the counter as a Moore Machine. |
| Design | The designing process doesn’t need to be very easy. | It is very easy to design. |