Learn more about Real-Time Workshop

Overview

The Simulink engine propagates data from one block to the next along signal lines. The data propagated consists of

• Data type

• Line widths

• Sample times

The first stage of code generation is compilation of the block diagram. This stage is analogous to that of a C or C++ program. The compiler carries out type checking and preprocessing. Similarly, the Simulink engine verifies that input/output data types of block ports are consistent, line widths between blocks are of the correct thickness, and the sample times of connecting blocks are consistent.

You can verify what data types any given Simulink block supports by typing

showblockdatatypetable

at the MATLAB prompt, or (from the Help browser) clicking the command above.

The Simulink engine typically derives signal attributes from a source block. For example, the Inport block's parameters dialog box specifies the signal attributes for the block.

In this example, the Inport block has a port width of 3, a sample time of .01 seconds, the data type is double, and the signal is complex.

This figure shows the propagation of the signal attributes associated with the Inport block through a simple block diagram.

In this example, the Gain and Outport blocks inherit the attributes specified for the Inport block.

Simulation Considerations That Affect Code Generation

Sample Time Propagation

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