Unit Delay Enabled Resettable - Delay signal one sample period, if external enable signal is on, with external Boolean reset

Library

Additional Math & Discrete / Additional Discrete

Description

The Unit Delay Enabled Resettable block combines the features of the Unit Delay Enabled and Unit Delay Resettable blocks.

The block can reset its state based on an external reset signal R. When the enable signal E is on and the reset signal R is false, the block outputs the input signal delayed by one sample period.

When the enable signal E is on and the reset signal R is true, the block resets the current state to the initial condition, specified by the Initial condition parameter, and outputs that state delayed by one sample period.

When the enable signal is off, the block is disabled, and the state and output do not change except for resets. The enable signal is on when E is not 0, and off when E is 0.

You specify the time between samples with the Sample time parameter. A setting of -1 means that the block inherits the Sample time.

Data Type Support

The Unit Delay Enabled Resettable block accepts signals of the following data types:

Floating point
Built-in integer
Fixed point
Boolean
Enumerated

The output has the same data type as the input u. For enumerated signals, the Initial condition must be of the same enumerated type as the input u.

For more information, see Data Types Supported by Simulink in the Simulink documentation.

Parameters and Dialog Box

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

Characteristics

Direct Feedthrough	No, of the input port No, of the enable port Yes, of the reset port
Sample Time	Specified in the Sample time parameter
Scalar Expansion	Yes
Zero-Crossing Detection	No