MATLAB DESIGN HDL CODER RELEASE NOTES User's Guide download pdf (Page 326)

326 www.xilinx.com System Generator for DSP User Guide

UG640 (v 12.2) July 23, 2010

Chapter 4: Importing HDL Modules

this_block.setEntityName('foo');

Note: The Configuration Wizard automatically sets the name of the top-level entity when it

generates a configuration M-function.

Defining Block Ports

The port interface of a black box is defined by the block's configuration M-function. Recall

that black box ports are defined using port descriptors. A port descriptor provides

methods for configuring various port attributes, including port width, data type, binary

point, and sample rate.

Adding New Ports

When defining a black box port interface, it is necessary to add input and output ports to

the block descriptor. These ports correspond to the ports on the module you are importing.

In your model, the black box block port interface is determined by the port names that are

declared on the block descriptor object. SysgenBlockDescriptor provides methods for

adding input and output ports:

Adding an input port:

this_block.addSimulinkInport('din');

Adding an output port:

this_block.addSimulinkOutport('dout');

The string parameter passed to methods addSimulinkInport and addSimulinkOutport

specifies the port name. These names should match the corresponding port names in

the imported module.

Note:

Use lower case text to specify port names.

Adding a bidirectional port:

config_phase = this_block.getConfigPhaseString;

if (strcmpi(config_phase,'config_netlist_interface'))

this_block.addInoutport('bidi');

% Rate and type info should be added here as well

end

Bi-directional ports are supported only during the netlisting of a design and will not

appear on the System Generator diagram; they only appear in the generated HDL. As

such, it is important to only add the bi-directional ports when System Generator is

generating the HDL. The if-end conditional statement is guarding the execution of the

code to add-in the bi-directional port.

It is also possible to define both the input and output ports using a single method call. The

setSimulinkPorts method accepts two parameters. The first parameter is a cell array of

strings that define the input port names for the block. The second parameter is a cell array

of strings that define the output port names for the block.

Note:

The Configuration Wizard automatically sets the port names when it generates a

configuration M-function

Obtaining a Port Object

Once a port has been added to a block descriptor, it is often necessary to configure

individual attributes on the port. Before configuring the port, you must obtain a descriptor

for the port you would like to configure. SysgenBlockDescriptor provides methods for

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