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trican
Senior
Joined: Oct 23, 2007
Posts: 33
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 Posted: Mon Jul 14, 2008 12:16 pm Post subject: Importing functions/tasks in a SV interface mod-port |
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All,
I have a number of simple tasks in a SV interface which I use to do a variety for things, (e.g. delay for a number of clock cycles). This works fine in NC, but it appears VCS (2006.06) doesn't support such importing/exporting of functions/tasks (and please correct me if I'm wrong with that statement).
Whats the best appraoch to get around this limitation?
[Just to clarify, when I call the constructor of a transactor, I pass in the mod port of the virtual intertface using the dot notation]
Last edited by trican on Fri Jul 18, 2008 5:31 am; edited 1 time in total |
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FIRE_VERA
Senior
Joined: Oct 25, 2007
Posts: 50
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| Posted: Fri Jul 18, 2008 5:18 am Post subject: |
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Are you getting any error when trying with VCS :
Can yo please provide more info so that we can think |
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trican
Senior
Joined: Oct 23, 2007
Posts: 33
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| Posted: Fri Jul 18, 2008 6:06 am Post subject: |
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The error in VCS just said that importing a task through a modport wasn't supported. For example the following gave this problem:
| Code: |
interface example (input bit clk);
default clocking cb @(posedge clk);
//signals
.....
endclocking
modport mp ( clocking cb, import wait_clks );
task wait_clks (input int i)
##i;
endtask
end interface
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I eventually got around this by moving the functionality of the waits_clks task back into a class, e.g.
| Code: |
class example_class
....
task wait_clks(int i );
repeat ( i )
@( this.<virtual_interface_with_modport_name>.cb );
endtask : wait_clks
....
endclass
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xxx
Senior
Joined: Jul 03, 2008
Posts: 13
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| Posted: Mon Jul 21, 2008 8:56 pm Post subject: |
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I think you can
1. define a class in the interface,
2. encapsulate the task in the class
3. instantiate an object name OBJ of that class in the interface
4. Include the ``input OBJ'' in your modport pin list
Then use it from an object connected to the interface using
interface.modport.object.task |
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