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Cannot use $cds_analog_exists or $cgav system tasks.

freitas
Hey all,
 
do I need to use any special option in order to use the cadence system tasks to fetch values associated with analog objects (i.e., $cds_analog_exists() or $cgav() )?  I'm using irun version 11.10-s057.
 
Here is a trivial example:  
 
File cgav.v  
module test;
   wire testv;
   initial
     begin
#0;
if ($cds_analog_exists("testv"))
 begin
    $display("testv belongs to the analog domain");
 end
     end   
endmodule 
 
Here how I try to run it: 
 > irun  cgav.v  
 
Here is what I get: 
*W,MISSYST (./cgav.v,9|22): Unrecognized system task or function (did not match built-in or user-defined names)  
*E,MSSYSTF (./cgav.v,9|22): User Defined system task or function registered during elaboration and used within the simulation has not been registered during simulation.
 
 
Thanks much!
 

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