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Parameterized subsystem : How to link module parameter with subsystem parameter


Khushi
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Hello

How to link subsystem level parameter to components under that subsystem.

For example, I have some module with condifurable width for sockets. I created that leaf with a module parameter and make their sockets dependent on that parameter. Now when I instantiate this module in a subsystem, instead of providing the hardcoded value for the socket width, I want to make it dependent on subsystem parameter so that subsystem instatiation will derive the socket width.

Really great if there exists some example for this.

Thank you

Khushi

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Hello Kushi,

In 1685-2014, you can add configurable element values to the designRef element inside designInstantiation:

            <ipxact:designInstantiation>
                <ipxact:name>RTL_cfg</ipxact:name>
                <ipxact:designRef vendor="accellera.org"  library="ipxact-wg" name="design" version="0.0">
                <ipxact:configurableElementValues>
                    <ipxact:configurableElementValue referenceId="myParameterId">A_id*B_id</ipxact:configurableElementValue>
                </ipxact:configurableElementValues>
                </ipxact:designRef>
            </ipxact:designInstantiation>
 

Here the value of the configurableElementValue is expression A_id*B_id. The terms are parameter IDs of parameters in this component:

    <ipxact:parameters>
        <ipxact:parameter parameterId="A_id" resolve="user" type="longint">
            <ipxact:name>A</ipxact:name>
            <ipxact:value>2</ipxact:value>
        </ipxact:parameter>
        <ipxact:parameter parameterId="B_id" resolve="user" type="longint">
            <ipxact:name>B</ipxact:name>
            <ipxact:value>2</ipxact:value>
        </ipxact:parameter>
    </ipxact:parameters>
 

The referenceId value "myParameterId" is referencing a parameter ID in your leaf component.

Please note that there are rules to separate two classes of parameters: view-specific parameters and view-independent parameters. View-specific parameters are parameters and moduleParameters in a component componentInstantiation, a component designConfigurationInstantiation, and in designConfiguration elements. You are not allowed to reference view-specific parameters outside of these mentioned elements. Hence, if you use reference a parameter in a port (in your case a socket), then this parameter cannot be a moduleParameter (since that is inside componentInstantation). To solve this, you have to create a component parameter P then and create a separate module parameter MP with a value P (so you can reference a view-independent parameters inside view-specific elements). You can then reference parameter P in the port also. 

Best regards,
Erwin

 

 

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Thank you Erwin.

In your example the "myParameterId" is a component parameter or design parameter ? I see it is referenced in designRef so I think this is a parameter defined in the design. Can you confirm this ?

Also what is the use of configurableElementValue under designConfigurationInstantiaton ?

Thank you

Khushi

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Hello Kushi,

Indeed myParameterId is a parameterId of a parameter in the design that is referenced by <ipxact:designRef vendor="accellera.org"  library="ipxact-wg" name="design" version="0.0">.

The configurableElementValue under designConfigurationInstantiaton sets the actual value of the parameter with parameterId myParameterId for this specific instantiation of the design with VLNV vendor="accellera.org"  library="ipxact-wg" name="design" version="0.0".

Best regards,
Erwin

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