cannot use $cds_analog_exists() or $cgav()

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!