State Transition Table
Represent modal logic in tabular format
Libraries:
Stateflow
Description
The State Transition Table block represents a finite state machine in tabular format. Instead of drawing states and transitions in a Stateflow® chart, you can use a state transition table to model a state machine in a concise, compact format that requires minimal maintenance of graphical objects. For more information, see Model Finite State Machines Using State Transition Tables.
To implement control logic, State Transition Table blocks can use MATLAB® or C as the action language. For more information, see Differences Between MATLAB and C as Action Language Syntax.
Examples
Model CD Player/Radio by Using State Transition Tables
A simple model of a CD Player/Radio logic that uses State Transition Tables in Stateflow®.
Ports
Input
When you create input data in the Stateflow state transition table using the Symbols pane, Stateflow creates a corresponding input port on the State Transition Table block.
Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated | bus | string
Output
When you create output data in the Stateflow state transition table by using the Symbols pane, Stateflow creates a corresponding output port on the State Transition Table block.
Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated | bus | string
Parameters
To edit block parameters interactively, use the Property Inspector. From the Simulink® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.
Note
State Transition Table blocks also have Subsystem (Simulink) block parameters that you can access by right-clicking the block and clicking Block Parameters (Subsystem). However, updating these block parameters is not recommended.
Method to update or wake up a Stateflow state transition table, specified as
Inherited,
Discrete, or
Continuous.
InheritedInput from the Simulink model determines when the state transition table wakes up during a simulation.
If you define input events for the state transition table, the signal from the Simulink block connected to the trigger port triggers the state transition table. The Simulink signal can be
Rising,Falling, orEither(rising and falling), or in response to aFunction Call. For more information, see Activate a Stateflow Chart by Sending Input Events.If you do not define input events, the Stateflow state transition table implicitly inherits triggers from the Simulink model. These implicit events are the discrete or continuous sample times of the Simulink signals that provide inputs to the state transition table. If you define data inputs, the state transition table wakes at the rate of the fastest data input. If you do not define any data input for the state transition table, the state transition table wakes up as defined by the execution behavior of its parent subsystem.
DiscreteThe Stateflow state transition table wakes when the Simulink model generates an implicit event at regular time intervals that you specify in the Sample Time state transition table property. Other blocks in the Simulink model can have different sample times.
ContinuousThe Stateflow state transition table updates its state during major time steps only, and computes outputs and local continuous variables during major and minor time steps. The state transition table can register zero crossings, which allows Simulink models to sample Stateflow state transition tables whenever state changes occur. The Stateflow state transition table computes derivatives for local continuous variables. For more information, see Continuous-Time Modeling in Stateflow.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | ChartUpdate |
| Values: | "INHERITED" (default) | "CONTINUOUS" | "DISCRETE" |
The default time interval is -1, which indicates that
the Stateflow state transition table inherits the sample time from
Simulink.
Specify the time interval at which the state transition table wakes up during simulation. The default value indicates that the state transition table inherits the sample time from Simulink. For more information on specifying sample time, see Specify Sample Time (Simulink).
Do not use the Sample Time parameter in the Subsystem block parameters. Instead, use the Property Inspector.
Dependencies
To enable this parameter, set Update method to
Discrete.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | SampleTime |
| Values: | "-1" (default) | string scalar | character vector |
| Data Types: | string | char |
Whether to create an active state data output port for the state transition table. For more information, see Monitor State Activity Through Active State Data.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | HasOutputData |
| Values: | false or
0 (default) | true or 1 |
| Data Types: | logical |
Monitoring mode for the active state output data.
Dependencies
To enable this parameter, enable Create output for monitoring.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | OutputMonitoringMode |
| Values: | "ChildActivity" (default) | "LeafStateActivity" |
Name of the active state data object for the state transition table.
Dependencies
To enable this parameter, enable Create output for monitoring.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | OutputPortName |
| Values: | "State_Transition_TableMode" (default) | string scalar | character vector |
| Data Types: | string | char |
Name of the active state data object for the state transition table.
Dependencies
To enable this parameter, enable Create output for monitoring.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | EnumTypeName |
| Values: | "State_Transition_TableModeType" (default) | string scalar | character vector |
| Data Types: | string | char |
Whether to define the enumerated data type for the active state data output manually. For more information, see Define State Activity Enumeration Type.
Dependencies
To enable this parameter, enable Create output for monitoring.
Programmatic Use
To set the block parameter value programmatically, access the Stateflow.StateTransitionTableChart object of the block
and change the object property by using dot notation.
| Parameter: | DoNotAutogenerateEnum |
| Values: | false or
0 (default) | true or 1 |
| Data Types: | logical |
Advanced
Whether to initialize the state configuration of the state transition table at time zero instead of at the first input event. For more information, see Execution of a Chart at Initialization.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | ExecuteAtInitialization |
| Values: | false or
0 (default) | true or 1 |
| Data Types: | logical |
Whether the data in the state transition table saturates on integer overflow. When you clear this parameter, the data in the state transition table wraps on integer overflow. For more information, see Handle Integer and Enumeration Overflow for Chart Data.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | SaturateOnIntegerOverflow |
| Values: | true or
1 (default) | false or 0 |
| Data Types: | logical |
Whether to initialize the output data every time the state transition table wakes up.
When you select this parameter, the state transition table resets its output values every time that the state transition table wakes up, not only at time 0. The state transition table resets the output values whenever function call, edge trigger, or clock tick triggers the state transition table. If you set an initial value for an output data object, the output resets to that value. Otherwise, the output resets to zero. Select this parameter to:
Ensure that all outputs are defined in every state transition table execution.
Prevent latching of outputs, that is, prevent values of outputs computed in previous executions.
Provide all state transition table outputs with a meaningful initial value.
For more information, see Initial value.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | InitializeOutput |
| Values: | false or
0 (default) | true or 1 |
| Data Types: | logical |
Whether the state transition table supports variable-size data. For more information, see Declare Variable-Size Data in Stateflow Charts.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | SupportVariableSizing |
| Values: | true or
1 (default) | false or 0 |
| Data Types: | logical |
Whether to enable super step semantics for the state transition table. Select this parameter to enable the state transition table to take multiple transitions in each time step until it reaches a stable state. This option is not available when you. For more information, see Super Step Semantics.
Dependencies
To enable this parameter, set Update method
to Discrete.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | EnableNonTerminalStates |
| Values: | false or
0 (default) | true or 1 |
| Data Types: | logical |
The maximum number of transitions that can be completed in one super step. For more information, see Super Step Semantics.
Dependencies
To enable this parameter, enable Enable super step semantics.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | NonTerminalMaxCounts |
| Values: | 1000 (default) | positive integer |
| Data Types: | single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 |
Action for Stateflow to take if super step exceeds maximum number of transitions in one super step. For more information, see Super Step Semantics.
Dependencies
To enable this parameter, enable Enable super step semantics.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | NonTerminalUnstableBehavior |
| Values: | "Proceed" (default) | "Throw Error" |
Since R2023a
Whether the state transition table treats non-scalar data with a dimension of length 1 as fixed size. When you select this parameter, the state transition table treats non-scalar data that have at least one dimension of length 1 as fixed size, regardless of whether you enable the Variable size data property. When you clear this parameter, the state transition table treats non-scalar data with the Variable size property enabled as variable size.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | TreatDimensionOfLengthOneAsFixedSize |
| Values: | true or
1 (default) | false or 0 |
| Data Types: | logical |
Action language to use to program the state transition table,
specified as MATLAB or C. For more
information, see Differences Between MATLAB and C as Action Language Syntax.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | ActionLanguage |
| Values: | "MATLAB" (default) | "C" |
State machine semantics implemented by the state transition table,
specified as Classic, Mealy, or
Moore. For more information, see Overview of Mealy and Moore Machines.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | StateMachineType |
| Values: | "Classic" (default) | "Mealy" | "Moore" |
Fixed-point properties
Inherited Simulink signals to treat as Fixed-Point Designer™
fi objects, specified as one of these values:
Fixed-point— The state transition table treats all fixed-point inputs asfiobjects.Fixed-point & Integer— The state transition table treats all fixed-point and integer inputs asfiobjects.
This parameter applies only to state transition tables that use MATLAB as the action language.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | TreatAsFi |
| Values: | "Fixed-point" (default) | "Fixed-point & Integer" |
Default fimath object properties for the state
transition table, specified as one of these values:
Same as MATLAB— The state transition table uses the samefimathobject properties as the current defaultfimathobject. The text box is dimmed and displays the current globalfimathobject in read-only form.Specify other— Specify your ownfimathobject in the text box.
For more information, see fimath Object Construction (Fixed-Point Designer).
Dependencies
To enable this parameter, set Action
language to
MATLAB.
Programmatic Use
To set the block parameter value programmatically, access the
Stateflow.StateTransitionTableChart object of the
block and change the object property by using dot notation.
| Parameter: | EmlDefaultFimath |
| Values: | "Same as MATLAB
Default" (default) | "Other:UserSpecified" |
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.
You can use a tunable parameter in a State Transition Table intended for HDL code generation. For details, see Generate DUT Ports for Tunable Parameters (HDL Coder).
This block has one default HDL architecture.
To generate an output port in the HDL code that shows the active state, in the Properties window of the chart, select Create output for monitoring. The output is an enumerated data type. See Simplify Stateflow Charts by Incorporating Active State Output.
| ConstMultiplierOptimization | Canonical signed digit (CSD) or factored CSD optimization. The
default is |
| ConstrainedOutputPipeline | Number of registers to place at
the outputs by moving existing delays within your design. Distributed
pipelining does not redistribute these registers. The default is
|
| DistributedPipelining | Pipeline register distribution,
or register retiming. The default is |
| InputPipeline | Number of input pipeline stages
to insert in the generated code. Distributed pipelining and constrained
output pipelining can move these registers. The default is
|
| OutputPipeline | Number of output pipeline stages
to insert in the generated code. Distributed pipelining and constrained
output pipelining can move these registers. The default is
|
| ResetType | Suppress reset logic generation. The default is |
| SharingFactor | Number of functionally equivalent resources to map to a single shared resource. The default is 0. See also Resource Sharing (HDL Coder). |
The block participates in these HDL optimizations to optimize the speed, and area.
Speed and Area Optimization
| Optimization | Description |
|---|---|
| Distributed Pipelining (HDL Coder) | Distributed pipelining, or register retiming, is a speed optimization that moves existing delays in a design to reduce the critical path while preserving functional behavior. |
| Resource Sharing (HDL Coder) | Resource sharing is an area optimization in which HDL Coder identifies multiple functionally equivalent resources and replaces them with a single resource. |
| Understand Delay Balancing in HDL Coder (HDL Coder) | When optimizations or block implementation options introduce delays along the critical path in a model, Delay Balancing detects introduction of new delays along one path, and then inserts matching delays on the other paths. |
| Clock-Rate Pipelining (HDL Coder) | Clock-rate pipelining is an optimization framework in HDL Coder that allows other speed and area optimizations to introduce latency at the clock rate. |
| Adaptive Pipelining (HDL Coder) | Adaptive pipelining optimization creates patterns or combination of blocks with registers that can improve the achievable clock frequency and reduce the area usage on the FPGA boards by inserting pipeline registers to the blocks in your design. |
| Critical Path Estimation (HDL Coder) | To quickly identify the most likely critical path in your design, use Critical Path Estimation. Critical path estimation speeds up the iterative process of finding the critical path. To know blocks that are characterized in critical path estimation, see Characterized Blocks (HDL Coder). |
To learn about restrictions, see Introduction to Stateflow HDL Code Generation (HDL Coder).
When you apply optimizations, the block has these limitations:
State Transition Table block that has State Machine Type property set to
Mooredoes not support HDL optimizations.HDL optimizations are not supported for the block that has Trigger port.
PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.
Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.
Version History
Introduced in R2012bTo convert a state transition table to a Stateflow chart, use the object function convertToChart.
To set the decomposition of a state transition table state to parallel, select the state. In the Modeling tab, select Set State Decomposition > Parallel (AND).
With the new property Treat dimensions of length 1 as fixed size, you can specify how state transition tables treat non-scalar data when at least one dimension has length 1. Prior to R2023a, state transition tables treated non-scalar data with at least one dimension of length 1 as fixed size, regardless of whether you enabled the Variable size data property.
Export the contents of a state transition table as a structure array by calling
the object function exportAsStruct.
The keyboard shortcut to append a transition column to a state transition table is now Ctrl+K. In previous releases, the shortcut was Ctrl+M.
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