Mealy Machine

Mealy Machine

In the Mealy machine, the output symbol at a given time is a function of the present input as well as the present state of the machine. 

Therefore the transition graph of the Mealy machine cannot be further simplified.

Mealy machine is defined as a 6 tuple (Q, Σ, ∆, δ, λ, q0) 

where, 

Q is a finite set of states. 

Σ is a set of input-symbols/alphabet. 

∆ is the output alphabet. 

δ is the transition function which maps Σ × Q onto Q. 

λ is the output function mapping Σ × Q to ∆. 

q0 is the initial state.

For example,

Mealy machine Transition table

Present State

Next State

a = 0

a = 1

Next State

Output

Next State

Output

q0

q1

0

q2

1

q1

q3

1

q2

1

q2

q2

1

q1

0

q3

q0

1

q3

1


Mealy machine
Transition diagram


Recommended:

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  4. DFA solved examples
  5. Definition of NFA
  6. Moore machine
  7. Mealy machine
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  2. Louden, “Programming Languages: Principles & Practices” , Cengage Learning 
  3. Tucker, “Programming Languages: Principles and paradigms “, Tata McGraw –Hill. 
  4. E Horowitz, "Programming Languages", 2nd Edition, Addison Wesley

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    3. KavehPahlavan, Prashant Krishnamurthy, “Networking Fundamentals”, Wiley Publication.
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