Unit Delay With Preview Resettable (Simulink Reference)

Simulink Reference

Unit Delay With Preview Resettable

Output the signal and the signal delayed by one sample period, with an external Boolean reset

Library

Additional Math & Discrete / Additional Discrete

Description

The Unit Delay With Preview Resettable block supports calculations that have feedback and depend on the current input.

The block can reset its state based on an external reset signal R. The block has two output ports. When the reset R is false, the upper port outputs the signal and the lower port outputs the signal delayed by one sample period.

When the reset R is true, the block resets the current state to the initial condition given by the Initial condition parameter. The block outputs that state delayed by one sample time through the lower output port, and outputs the state without a delay through the upper output port.

The input u and initial condition IC must be the same data type, but can be any data type. The output is the same data type as the inputs u and IC. The reset R can be any data type.

You specify the time between samples with the Sample time parameter. A setting of -1 means the Sample time is inherited.

Data Type Support

The Unit Delay With Preview Resettable block accepts signals of any data type supported by Simulink, including fixed-point data types.

Parameters and Dialog Box

Initial condition: Specify the initial condition.
Sample time: Specify the time interval between samples. To inherit the sample time, set this parameter to -1. See Specifying Sample Time in the online documentation for more information.

Characteristics

Direct Feedthrough
Yes, to upper output port
No, to lower output port

Sample Time
Specified in the Sample time parameter

Scalar Expansion
Yes

Direct Feedthrough	Yes, to upper output port No, to lower output port
Sample Time	Specified in the Sample time parameter
Scalar Expansion	Yes

Unit Delay With Preview Enabled Resettable External RV Unit Delay With Preview Resettable External RV