I am writing a testbench in VerilogAMS that needs to use the `ifdef compiler directive for each test. if a test is defined then I want to place in a netlisted module, this way I can controle its parameters without having to write the same source code again and again. However I can not do this inside an anaolg block. It works outside without a problem when the ifdef is defined. But when it is not defined the `else (as it is also outside the analog block), that says the test is not being run, will not compile and I get error messages.

Can anybody help with this problem?

Hello Andrew,

Here is a simple example of the code that I am trying to execute:

`include "constants.vams"
`include "disciplines.vams"

//`define test1

module TEST (pin);
     electrical pin;

integer t1;
     
     
analog begin

`ifdef test1
     tim #(.th_start(1), .th_stop(4), .dir(1)) (*integer library_binding = "TESTBENCH";*) test1 (.tim(pin));
`else
     t1 = 1;
`endif



@(final_step) begin

      if (t1)begin
            $strobe("No EXECUTION OF test1");
      end
end

end      //end of analog process



endmodule


The code as it is above will compile and when simulated I get the correct message "No execution of test 1." However If I define test 1, the compilation fails. the error messages are:

Expecting a “=” or “<=” in an assignment (where the # is after tim)
Illegal expression in primary (after the first “.”)
Expecting a right parenthesis (after the first “,”)
Expecting a “;” (after the second “,”)
Illegal expression in primary (after the third “.”)
Expecting a “;” (after test1)
Illegal expression in primary (after the next “.”)
Statement not allowed inside analog block (at the final “;”)

With these messages I moved the `ifdef and the `else statements outside of the analog block. When defined this time, the test ran with success. However when undefined, the `else would not compile.

My compilation tool is : 05.10-s006  

I hope that my problem has been made a little clearer.

Thanking you,
Andrew

Hello Andrew,

Thankyou for the solution, it worked perfectly. I have a few language reference manuals and I can not find the `ifndef compiler directive in any of them. You have helped me very much. And yes the sample code that I posted was just  one in which I used to reproduce the error.

Cheers,
Andrew