Resettable Delay

Specify whether to enter the delay length directly on the dialog box (fixed delay) or to inherit the delay from an input port (variable delay).

Specify the scalar delay length as a real, non-negative integer. An out-of-range or non-integer value in the dialog box (fixed delay) returns an error. An out-of-range value from an input port (variable delay) casts it into the range. A non-integer value from an input port (variable delay) truncates it to the integer.

Programmatic Use

Specify whether to enter the initial condition directly on the dialog box or to inherit the initial condition from an input port.

Simulink^® converts offline the data type of Initial condition to the data type of the input signal u using a round-to-nearest operation and saturation.

Programmatic Use

Specify whether the block performs sample- or frame-based processing:

Use Input processing to specify whether the block performs sample- or frame-based processing. For more information about these two processing modes, see Sample- and Frame-Based Concepts (DSP System Toolbox).

Programmatic Use

Select to use a circular buffer for storing the state in simulation and code generation. Otherwise, an array buffer stores the state.

Using a circular buffer can improve execution speed when the delay length is large. For an array buffer, the number of copy operations increases as the delay length goes up. For a circular buffer, the number of copy operations is constant for increasing delay length.

If one of the following conditions is true, an array buffer always stores the state because a circular buffer does not improve execution speed:

Programmatic Use

Select to increase the delay length from zero to the lower limit for the Input processing mode:

Selecting this check box prevents direct feedthrough from the input port, u, to the output port. However, this check box cannot prevent direct feedthrough from the initial condition port, x0, to the output port.

Dependency

To enable this parameter, set Delay length: Source to Input port.

Programmatic Use

Select to remove code that checks for out-of-range delay length.

Dependency

To enable this parameter, set Delay length: Source to Input port.

Programmatic Use

Specify whether to produce a warning or error when the input d is less than the lower limit or greater than the Delay length: Upper limit. The lower limit depends on the setting for Prevent direct feedthrough.

Options for the diagnostic include:

Dependency

To enable this parameter, set Delay length: Source to Input port.

Programmatic Use

Select to control execution of this block with an enable port. The block is considered enabled when the input to this port is nonzero, and is disabled when the input is 0. The value of the input is checked at the same time step as the block execution.

Programmatic Use

Specify the trigger event to use to reset the states to the initial conditions.

The reset signal must be a scalar of type single, double, boolean, or integer. Fixed point data types, except for ufix1, are not supported.

Programmatic Use

Specify the time interval between samples. To inherit the sample time, set this parameter to -1. This block supports discrete sample time, but not continuous sample time.

Programmatic Use

Use this parameter to assign a unique name to the block state. The default is ' '. When this field is blank, no name is assigned. When using this parameter, remember these considerations:

This parameter enables State name must resolve to Simulink signal object when you click Apply.

For more information, see C Data Code Interface Configuration for Model Interface Elements (Simulink Coder).

Programmatic Use

Select this check box to require that the state name resolves to a Simulink signal object.

Dependencies

To enable this parameter, specify a value for State name. This parameter appears only if you set the model configuration parameter Signal resolution to a value other than None.

Programmatic Use