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The state diagram for a Mealy machine associates an output value with each transition edge, in contrast to the state diagram for a Moore machine, which associates an output value with each state. When the input and output alphabet are both Σ , one can also associate to a Mealy automata a Helix directed graph [ clarification needed ] ( S × Σ ...
State diagram for a Mealy machine. Date: 27 February 2007: Source: Own work, derived from Mealymachine_jaredwf.png. Author: Jake Choules: Other versions: Derivative works of this file: CPT-FSM-Mealy-01.svg. Mealymachine_jaredwf.png
A state diagram for a door that can only be opened and closed. A state diagram is used in computer science and related fields to describe the behavior of systems. State diagrams require that the system is composed of a finite number of states. Sometimes, this is indeed the case, while at other times this is a reasonable abstraction.
Now if the machine is in the state S 1 and receives an input of 0 (first column), the machine will transition to the state S 2. In the state diagram, the former is denoted by the arrow looping from S 1 to S 1 labeled with a 1, and the latter is denoted by the arrow from S 1 to S 2 labeled with a 0.
State diagram for a turnstile A turnstile. An example of a simple mechanism that can be modeled by a state machine is a turnstile. [4] [5] A turnstile, used to control access to subways and amusement park rides, is a gate with three rotating arms at waist height, one across the entryway.
Figure 7: State roles in a state transition. In UML, a state transition can directly connect any two states. These two states, which may be composite, are designated as the main source and the main target of a transition. Figure 7 shows a simple transition example and explains the state roles in that transition.
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The method was named after its inventor, Charles L. Richards. It allows for easier design of complex finite-state machines than the traditional techniques of state diagrams, state-transition tables and Boolean algebra offer. Using Richards's technique, it becomes easier to implement finite-state machines with hundreds or even thousands of states.