Calling VHDL procedures in SystemVerilog Testbench.

Hi Mirzani.

Hierarchical references to VHDL are not supported yet. I believe this is due to restrictions in the VHDL specification.
I've been told this will change in the next version of VHDL, but I don't know any more than that.

Steve.

I should have used the word 'import' instead of call .
I was wondering if there is an equivalent hdl_task(VERA) to import the VHDL procedures placed in a separate package..

Though not in LRM, in principle SV DPI can be extended for this. But why wait? I've been doing this for several years now with little WA. Pseudo-code:

VHDL
=======
procedure vhdl_proc;...

entity dummy (call_vhdl_proc : in bit)
...

arch..
  process (call_vhdl_proc)
     vhdl_proc

Verilog
--------

// Instantiate the dummy VHDL, toggle the "call_vhdl_proc"
   
HTH
Ajeetha, CVC
www.noveldv.com

Hi,  I would also like to know if there is a way to map verilog tasks to system verilog tasks. Trying to build sys verilog wrappers around verilog tasks

Hi, Thanks for the reply. We'll be having a verification environment which includes basic verilog tasks. The upper level sys verilog TB will have to make use of these tasks. So how can I refer to these verilog tasks from sys verilog. Does importing help? or shud we wrap the verilog tasks & use something similar to hdl_task as in Vera??

Yes Same problem I am facing. I need to call [b] Verilog tasks defined in a module <> hierarchy [/b], from my [b] classes in SystemVerilog [/b].
How can it be made possible ??

even defining them as extern task<> in SystemVerilog, it's giving compile time error, saying no module defined.

Is there any way to call them through Interface definition etc..??

Regards
Mayank

Yes Same problem I am facing. I need to call Verilog tasks defined in a module <> hierarchy , from my classes in SystemVerilog .
How can it be made possible ??

even defining them as extern task<> in SystemVerilog, it's giving compile time error, saying no module defined.

Is there any way to call them through Interface definition etc..??

Regards
Mayank

Mayank,
      To call a task from within a class, one can go via virtual interface:

  interface my_if;
     task my_task;
 //

  class my_c;
    virtual my_if my_if_0;

    task call_task();
       my_if_0.my_task;

However I've seen tools not fully supporting this yet/premamture support. Till then you are better off with a WA like:

  interface my_if;
     task my_task; endtask


     always @my_trigger begin
         my_task;
     end

Then trigger this "my_trigger" from within the class.

This was skeleton code, if you have more problems, show us full code or send it to me via email (ajeetha <> gmail), I will see if I can help.

HTH
Ajeetha, CVC
www.noveldv.com