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Output the signal and the signal delayed by one sample period, if the external enable signal is on, with an external RV reset
Library
Additional Math & Discrete / Additional Discrete
Description
The Unit Delay With Preview Enabled Resettable External RV 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 external enable signal E is on and the reset R is false, the upper port outputs the signal and the lower port outputs the signal delayed by one sample period. The block has two input ports, one for the input signal u and the other for the enable signal E.
When the enable signal E is on and the reset R is true, the upper output signal is forced to equal the external reset signal RV. The lower output signal is not affected until one time step later, at which time it is equal to the external reset signal RV at the previous time step. The block uses the internal Initial condition only when the model starts or when a parent enabled subsystem is used. The internal Initial condition only affects the lower output signal. The first output is only affected through feedback.
When the Enable signal is off, the block is disabled, and the state and output values do not change, except for resets. The enable signal is on when E is not 0, and off when E is 0.
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 Enabled Resettable External RV block accepts signals of any data type supported by Simulink, including fixed-point data types.
Parameters and Dialog Box
-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 |
See Also
Unit Delay, Unit Delay Enabled, Unit Delay Enabled External IC, Unit Delay Enabled Resettable, Unit Delay Enabled Resettable External IC, Unit Delay External IC, Unit Delay Resettable, Unit Delay Resettable External IC, Unit Delay With Preview Enabled, Unit Delay With Preview Enabled Resettable, Unit Delay With Preview Resettable, Unit Delay With Preview Resettable External RV
| | Unit Delay With Preview Enabled Resettable | Unit Delay With Preview Resettable | |
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