User defined attributes for component instances

Posted Fri, 2009-11-13 01:45 by Bagoj

Hi there!

attribute CLKOUT_PHASE_SHIFT of DCM_GCLK : label is "FIXED";

I got an error for lines like this saying that declaration os DCM_GCLK could not be fount. It's in the architecture body since it is a component instance. I don't know if it is standard or not but xilinx tools use this. Am i missing something here?

Thank you!

‹ using libraries other than work compilation error ›

Used before declaration?

by heeckhau (Sigasi) - 2009-11-13 15:42

Hi Bagoj,

What is DCM_GCLK? And where is its declaration? I assume it is after the attribute declaration.

I did some research and experimentation, and you probably discovered a bug in our analyzer. VHDL allows to declare attributes of 'items' (labels, ...) before they are declared. E.g.:

ENTITY my_entity IS END;
 
ARCHITECTURE my_arch OF my_entity IS
   COMPONENT my_comp end component;
   ATTRIBUTE my_atribute OF my_label : LABEL IS "true"; -- my_label is used here
BEGIN
   my_label : my_comp; -- my_label is declared here
END my_arch;

I have logged this as ticket:655

Yes, that's what i'm talking

by Bagoj - 2009-11-13 22:58

Yes, that's what i'm talking about. DCM_GCLK is a Xilinx DCM_SP primitive. The component is declared before the attribute declaration but the attribute refers to the instance DCM_GCLK what is located in the architecture body. Not a big deal i can ignore those errors untill you fix this.
Thank you.

Similar/Related

by josyb - 2009-11-17 20:34

I found a similar/related problem:

 
   ...
   );
END syspllreconfig;
 
 
ARCHITECTURE RTL OF syspllreconfig IS
 
	ATTRIBUTE synthesis_clearbox: natural;
	ATTRIBUTE synthesis_clearbox OF RTL: ARCHITECTURE IS 2;
...

Here Hdt complains : Declaration of RTL could not be found
This is an Altera MegaWizard generated file, so I should not edit it. Of course I will ignore that error for now.

Best regards.

In the latest release this

by heeckhau (Sigasi) - 2009-11-30 10:59

In the latest release this incorrect error message is gone.

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