Memory

The Memory block holds and delays its input by one major timestep. This version supports variable-size signals and discrete sample times.

Library

QUARC Targets/Discrete

Description

The Memory block holds and delays its input by one major timestep. The QUARC version of the block acts like both the Memory and Unit Delay blocks combined, since the QUARC block accepts a continuous or discrete sample time. Also, the QUARC Memory block accepts the built-in Simulink data types, bus signals and variable-size signals. The Simulink version of the block does not currently accept variable-size signals.

To set the initial conditions for a bus signal, either use a scalar for the Initial condition parameter, which will initialize all the bus elements to the same value, or use a MATLAB structure which mirrors the bus signal in the order of the fields, the names of the fields, and the data types of the fields.

Helpful Hints

Variable-size signals

When using the Memory block with variable-size signals in subsystems, make sure any Action Port, Enable or Trigger ports are configured to propagate the sizes of variable-size signals during execution.

Input Ports

The input signal to be delayed.

Output Ports

The output is the delayed signal.

Data Type Support

This block accepts the built-in Simulink data types, as well as bus signals and variable-size signals. See Using Bus Objects with QUARC for more information on bus signals. See Variable-Size Signals for more information on variable-size signals.

Parameters and Dialog Box

Initial Condition

Specifies the initial value of the output.

Sample Time

The sample time of the block. A sample time of 0 indicates that the block will be treated as a continuous time block. A positive sample time indicates that the block is a discrete time block with the given sample time.

A sample time of -1 indicates that the block inherits its sample time. The default sample time is set to -1 to inherit the sample time.

To use the fundamental sampling time of the model, set the sample time to qc_get_step_size, which is a QUARC function that returns the fundamental sampling time of the model.

Targets

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