Reset

Control block for resettable subsystem

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Description

A Reset block placed at the root level of a Subsystem block adds a control port to the block. When a reset trigger signal occurs on the signal connected to the port, the block states of the subsystem are reset to their initial condition. See Resettable Subsystem.

Examples

Resettable Subsystems

Use two resettable subsystems to implement a ramp signal.

• Open Model

Discrete and Continuous Resettable Subsystems

Compares the behavior of discrete and continuous resettable subsystems. After you run the simulation, one scope shows the results for the discrete resettable subsystem, and the other scope shows the results for the continuous resettable subsystem.

• Open Model

Parameters

Reset trigger type — Select the type of trigger event

level (default) | rising | falling | either | level hold

Select the type of trigger signal that resets the subsystem block states.

level

Reset the block states when the trigger signal is nonzero at the current time step or changes from nonzero at the previous time step to zero at the current time step.

rising

Reset the block states when the trigger signal rises from a zero to a positive value or from a negative to a positive value.

falling

Reset the block states when the trigger signal falls from a positive value to zero or from a positive to a negative value.

either

Reset the block states when the trigger signal changes from a zero to a nonzero value or changes sign.

level hold

Reset the block states when the trigger signal is nonzero at the current time step.

Programmatic Use

Block Parameter: ResetTriggerType

Type: character vector

Value: 'level' | 'rising' | 'falling' | 'either' | 'level hold'

Default: 'level'

Propagate sizes of variable-size signals — Select when to propagate a variable-size signal

During execution (default) | Only when enabling

Select when to propagate a variable-size signal.

During execution

Propagate variable-size signals at each time step.

Only when resetting

Propagate variable-size signals when resetting a Subsystem block containing a Reset port block. When you select this option, sample time must be periodic.

Programmatic Use

Block Parameter: PropagateVarSize

Type: character vector

Value: 'During execution' | 'Only when resetting'

Default: 'During execution'

Enable zero-crossing detection — Control zero-crossing detection

on (default) | off

Control zero-crossing detection.

on

Detect zero crossings.

off

Do not detect zero crossings.

Programmatic Use

Block Parameter: ZeroCross

Type: character vector

Value: 'on' | 'off'

Default: 'on'

Extended Capabilities

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

HDL Architecture

This block has one default HDL architecture.

Version History

Introduced in R2015a

R2025a: Variant control variables in mask and model workspaces supported

You can define variant control variables in the mask and model workspaces to control active variants in the Reset Function block, provided the Generate preprocessor conditionals parameter is off.