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Detecting existence of cds_global variable in AMS

I can reference a cds_global variable in a verilogams view by using cds_globals.variableName. However, I'd like to be able to test its existence, and the to set it to a default value if it is not defined by the user. Something like the below...

if(exists cds_globals.signalName)

output=cds_globals.signalName;

else

output = 7;

Is there a way to do this? I tried "`ifdef / `elsif / `endif" and that always followed the "elsif" path.

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