Stateflow

State Decomposition

A state has a decomposition when it consists of one or more substates. A Stateflow diagram that contains at least one state also has decomposition. Representing hierarchy necessitates some rules around how states can be grouped in the hierarchy. A superstate has either parallel (AND) or exclusive (OR) decomposition. When looking at any one point in the hierarchy, all substates of a superstate must be of the same type.

Parallel (AND) State Decomposition

Parallel (AND) state decomposition is indicated when states have dashed borders. This representation is appropriate if all states at that same level in the hierarchy are active at the same time. The activity within parallel states is essentially independent. The children of parallel (AND) decomposition parents are AND states.

Exclusive (OR) State Decomposition

Exclusive (OR) state decomposition is represented by states with solid borders. Exclusive (OR) decomposition is used to describe system modes that are mutually exclusive. When a state has exclusive (OR) decomposition, only one substate can be active at a time. The children of exclusive (OR) decomposition parents are OR states.

States

Active and Inactive States