What Is Mealy Machine?

In the theory of computation, a Mealy machine is a finite-state machine whose output values are determined both by its current state and the current inputs.

Mealy machine can be described by a 6 tuple (Q, δ, Ʃ, O, X, q0 ) where:

• Q is a finite set of states.
• Ʃ is a finite set of symbols referred to as the input alphabets.
• δ is the input transition function where δ:Q x Ʃ ―>Q
• O is a finite set of symbols referred to as output alphabet.
• X is the output transition function where X:Q x Ʃ―>O
• q0 is the initial state from where any input is processed (q0 ϵQ)

What You Need To Know About Mealy Machine

• Mealy machine changes its output based on its current input and present state.
• Mealy machine will have same or fewer states than Moore machine.
• Output is placed on transition.
• The value of the output function is a function of the transitions and the changes, when the input logic on the present state is done.
• Mealy machines react faster to inputs. They generally react in the same clock cycle.
• Asynchronous output generation through the state changes synchronous to the clock.
• Generally requires fewer states for synthesis.
• Requires less hardware to design.
• A counter is not a Mealy machine.
• Not necessarily easy to design.

What Is Moore Machine?

In the theory of computation, a Moore machine is a finite-state machine whose output values are determined only by its current state. A Moore machine can be described as by a 6 tuple (Q, δ, Ʃ, O, X, q0 ) where:

• Q is a finite set of states.
• Ʃ is a finite set of symbols referred to as the input alphabets.
• δ is the input transition function where δ:Q x Ʃ ―>Q
• O is a finite set of symbols referred to as output alphabet.
• X is the output transition function where X:Q x Ʃ―>O
• q0 is the initial state from where any input is processed (q0 ϵQ)

What You Need To Know About Moore Machine

• Output of Moore machine only depends on its current state and not on the current input.
• Generally, it has more states than Mealy machine.
• Output is placed on transition.
• The value of the output function is a function of the current state and the changes at the clock edges, whenever state changes occur.
• In Moore machines, more logic is required to decode the output resulting in more circuit delays. They generally react one clock cycle later.
• Both output and state change synchronous to the clock edge.
• Generally requires more states for synthesis.
• More hardware is required to design.
• A counter is a Moore machine.
• Easy to design.

Difference Between Mealy And Moore Machine  In Tabular Form

ncG1vNJzZmiumauupbXFn5yrnZ6YsrR6wqikaJyZm7OmvsSnmp5lkprBuLHEp2SmnZGhxm6tzZ1kpqefp7JuucCcn6KmlWQ%3D