Output signal and signal delayed by one sample period, with external RV reset
Additional Math & Discrete / Additional Discrete
The Unit Delay With Preview Resettable External RV block supports
calculations that have feedback and depend on the current input. The
block can reset its state based on a reset signal
The block has three input ports: one for the input signal
one for the external reset signal
R, and one for
the external reset value
When the reset signal
R is false, the first
port outputs the signal and the second port outputs the signal delayed
by one sample period.
When the reset signal
R is true, the first
output signal is forced to equal the reset value
The second output signal is not affected until one time step later,
at which time it is equal to the reset value
the previous time step. The internal Initial condition has
a direct effect on the second output only when the model starts or
when a parent enabled subsystem is reset.
This reset action is vectorized and supports scalar expansion.
Having two outputs is useful for implementing recursive calculations where the result includes the most recent inputs. The second output can feed back into calculations of the block's inputs without causing an algebraic loop. Meanwhile, the first output shows the most up-to-date calculations.
You specify the time between samples with the Sample
time parameter. A setting of
that the block inherits the Sample time.
The Unit Delay With Preview Resettable External RV block accepts signals of the following data types:
The outputs have the same data type as the input
For enumerated signals, the Initial condition must
be of the same enumerated type as the input
For more information, see Data Types Supported by Simulink in the Simulink® documentation.
Specify the initial output of the simulation.
Specify the time interval between samples. To inherit the sample
time, set this parameter to
Specify Sample Time in
the online documentation for more information.
Yes, to first output port
No, to second output port
Specified in the Sample time parameter
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