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Button Usage

Pause a simulation.

Stop a simulation.

Analyze model and store derived minimum and maximum results.

Propose data types. Propose fraction lengths for specified word lengths or propose word lengths for specified fraction lengths.

Apply accepted data types.

Show details for selected result.

Compare selected runs.

Create a difference plot for the selected signals.

Plot the selected signal.

Create a histogram plot for the selected signal.

The toolbar also contains the Show option:

The Show option specifies the type of results to display in the Contents pane. The Contents pane displays information only after you simulate

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a system or propose fraction lengths. If there are no results that satisfy a particular filter option, the list will be blank.

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example, G2(2) means group G2 has 2 members. This information enables you to see how many members of a group belong to the selected subsystem and which groups share data types across subsystem boundaries.

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Model Hierarchy Pane

The Model Hierarchy pane displays a tree-structured view of the Simulink model hierarchy. The first node in the pane represents a Simulink model. Expanding the root node displays subnodes that represent the model’s subsystems, MATLAB Function blocks, Stateflow charts, and referenced models.

The Fixed-Point Tool’s Contents pane displays elements that comprise the object selected in the Model Hierarchy pane. The Dialog pane provides parameters for specifying the selected object’s data type override and fixed-point instrumentation mode. Objects that control the

Fixed-point instrumentation mode parameter display a red flag on their icons, while those that control the Data type override parameter display a green flag. The Model Hierarchy pane indicates the value of these parameters by displaying the following abbreviations next to the object name:

Abbreviation Parameter Value

Fixed-point instrumentation mode

Data type override

See “Dialog Pane” on page 4-151 for more information about these parameters.

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Contents Pane

The Contents pane displays a tabular view of objects that log fixed-point data in the system or subsystem selected in the Model Hierarchy pane. The table rows correspond to model objects, such as blocks, block parameters, and Stateflow data. The table columns correspond to attributes of those objects, such as the data type, design minimum and maximum values, and simulation minimum and maximum values.

The Contents pane displays information only after you simulate a system, analyze the model to derive minimum and maximum values, or propose fraction lengths.

You can control which of the following columns the Fixed-Point Tool displays in this pane. For more information, see “Customizing the Contents Pane View” on page 4-148.

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ModelRequiredMax Maximum value of a parameter used during simulation. For example, the n-D Lookup Table block uses the Breakpoints and Table data parameters to perform its lookup operation and generate output. In this example, the block uses more than one parameter so the Fixed-Point Tool sets

ModelRequiredMax to the maximum of the maximum values of all these parameters.

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Customizing the Contents Pane View

You can customize the Contents pane in the following ways:

•“Using Column Views”

•“Changing Column Order and Width”

•“Sorting Rows by Column”

Using Column Views

The Fixed-Point Tool provides the following standard Column Views:

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By selecting Show Details, you can:

•Customize the standard column views

•Create your own column views

•Reset views to factory settings

•Export and import column views saved in MAT-files, which you can share with other users

For more information on controlling views, see “Control Model Explorer Contents Using Views”

Changing Column Order and Width

You can alter the order and width of columns that appear in the

Contents pane as follows:

•To move a column, click and drag the head of a column to a new location among the column headers.

•To make a column wider or narrower, click and drag the right edge of a column header. If you double-click the right edge of a column header, the column width changes to fit its contents.

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Sorting by Columns

By default, the Contents pane displays its contents in ascending order of the Name column. You can alter the order in which the Contents pane displays its rows as follows:

•To sort all the rows in ascending order of another column, click the head of that column.

•To change the order from ascending to descending, simply click again on the head of that column.

Dialog Pane

Use the Dialog pane to view and change properties associated with the object selected in the Model Hierarchy pane.

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The Dialog pane includes the following components:

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Tips

From the Fixed-Point Tool View menu, you can customize the layout of the Dialog pane. Select:

•Show Dialog View to show/hide the Dialog pane. By default, the Fixed-Point Tool displays this pane. Hide it to make more room for displaying results.

•Settings for selected system to show/hide the Settings for selected system pane. By default, the Fixed-Point Tool displays this pane.

•Show Fixed-Point Advisor to show/hide the Prepare conversion in the Fixed-Point Advisor button. By default, the Fixed-Point Tool displays this button.

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Fixed-Point Advisor

Open the Fixed-Point Advisor

Action

Opens the Fixed-Point Advisor which guides you through the tasks to prepare a floating-point model for conversion to fixed point.

Use the Fixed-Point Advisor if:

•You have a floating-point model

•You have inheritance rules in your model

•Your model contains blocks that do not support fixed-point data types

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Shortcuts to set up runs

Use shortcuts to configure model-wide data type override and instrumentation settings prior to simulation. The Fixed-Point Tool provides:

•Frequently-used factory default shortcuts

•The ability to add and edit custom shortcuts

Note The factory default shortcuts apply to the whole model. You cannot use these shortcuts to configure subsystems.

Factory Defaults

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Factory Default Shortcut Description

Add/Edit shortcuts

Use Add/Edit shortcuts to open the “Shortcut Editor” on page 4-184, which you use to add new shortcuts or edit existing user-defined shortcuts. You cannot edit the factory default shortcuts.

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Fixed-point instrumentation mode

Control which objects log minimum, maximum and overflow data during simulation.

Settings

Default: Use local settings

Use local settings

Logs data according to the value of this parameter set for each subsystem. Otherwise, settings for parent systems always override those of child systems.

Minimums, maximums and overflows

Logs minimum value, maximum value, and overflow data for all blocks in the current system or subsystem during simulation.

Overflows only

Logs only overflow data for all blocks in the current system or subsystem.

Force off

Does not log data for any block in the current system or subsystem. Use this selection to work with models containing fixed-point enabled blocks if you do not have a Simulink Fixed Point license.

Tips

•The Fixed-Point Tool marks the system controlling the Fixed-point instrumentation mode with a red flag .

•You cannot change the instrumentation mode for linked subsystems or referenced models.

Dependencies

The value of this parameter for parent systems controls min/max logging for all child subsystems, unless Use local settings is selected.

Command-Line Alternative

Parameter: 'MinMaxOverflowLogging'

Type: string

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Value: 'UseLocalSettings' | 'MinMaxAndOverflow' | 'OverflowOnly' | 'ForceOff'

Default: 'UseLocalSettings'

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Data type override

Control data type override of objects that allow you to specify data types in their dialog boxes.

Settings

Default: Use local settings

The value of this parameter for parent systems controls data type override for all child subsystems, unless Use local settings is selected.

Use local settings

Overrides data types according to the setting of this parameter for each subsystem.

Scaled double

Overrides the data type of all blocks in the current system and subsystem with doubles; however, the scaling and bias specified in the dialog box of each block is maintained.

Double

Overrides the output data type of all blocks in the current system or subsystem with doubles. The overridden values have no scaling or bias.

Single

Overrides the output data type of all blocks in the current system or subsystem with singles. The overridden values have no scaling or bias.

Off

No data type override is performed on any block in the current system or subsystem. The settings on the blocks are used.

Tips

•Set this parameter to Double or Single and the Data type override applies to parameter to All numeric types to work with models containing fixed-point enabled blocks if you do not have a Simulink Fixed Point license.

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•You cannot change the Data type override setting on linked subsystems or referenced models.

•The Fixed-Point Tool marks the system controlling the Data type override mode with a green flag .

•Data type override never applies to boolean data types.

•When you set the Data type override parameter of a parent system to Double, Single, Scaled double or Off, this setting also applies to all child subsystems and you cannot change the data type override setting for these child subsystems. When the Data type override parameter of a parent system is Use local setting, you can set the Data type override parameter for individual children.

•Use this parameter with the Data type override applies to parameter. The following table details how these two parameters affect the data types in your model.

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Dependencies

•The following Simulink blocks allow you to set data types in their block masks, but ignore the Data type override setting:

•The MATLAB Function block does not support the Data type override setting Scaled double.

•Stateflow does not support the Data type override setting Scaled double.

Command-Line Alternative

Parameter: 'DataTypeOverride'

Type: string

Value: 'UseLocalSettings' | 'ScaledDouble' | 'Double' | 'Single' | 'Off'

Default: 'UseLocalSettings'

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Data type override applies to

Specifies which data types the Fixed-Point Tool overrides

Settings

Default: All numeric types

All numeric types

Data type override applies to all numeric types, floating-point and fixed-point. It does not apply to boolean or enumerated data types.

Floating-point

Data type override applies only to floating-point data types, that is, double and single.

Fixed-point

Data type override applies only to fixed-point data types, for example, uint8, fixdt.

Tips

•Use this parameter with the Data type override parameter.

•Data type override never applies to boolean or enumerated data types or to buses.

•When you set the Data type override parameter of a parent system to Double, Single, Scaled double or Off, this setting also applies to all child subsystems and you cannot change the data type override setting for these child subsystems. When the Data type override parameter of a parent system is Use local setting, you can set the Data type override parameter for individual children.

•The following table details how these two parameters affect the data types in your model.

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Dependencies

This parameter is enabled only when Data type override is set to

Scaled double, Double or Single.

Command-Line Alternative

Parameter: 'DataTypeOverrideAppliesTo'

Type: string

Value: 'AllNumericTypes' | 'Floating-point' | 'Fixed-point'

Default: 'AllNumericTypes'

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Store results in run

Specifies the run name

If you use a shortcut to set up a run, by default, the Fixed-Point Tool uses the run name associated with this shortcut. You can override the run name by entering a new name in this field.

Tips

•To store data for multiple runs, provide a different run name for each run. Running two simulations with the same run name overwrites the original run.

•You can edit the run name in the Contents pane Run column.

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