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Forum: FPGA, VHDL & Verilog Error when using with-select-when in VHDL


Error when using with-select-when in VHDL
von Ayush K. (ayushkhemka)

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Can someone explain to me this error and how to solve it?

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architecture xxx of yyy is

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--

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signal wrptr,rdptr: std_logic_vector(n-1 downto 0);

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--

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begin

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process(reset,clk)

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begin

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--

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end process;

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with rdptr select

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--

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with wrptr select

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--

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process(we,dmuxout)

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--

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end process;

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end xxx;


The errors are:
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Illegal expression

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xx.vhd, 40

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yyy

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  with rdptr select

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       ^

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  Expression must be the name of an object whose subtype is locally static, or

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  it must be a qualified expression or type conversion whose type mark denotes

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  a locally static subtype.

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Illegal expression

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xx.vhd, 40

13
yyy

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  with wrptr select

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       ^

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  Expression must be the name of an object whose subtype is locally static, or

18
  it must be a qualified expression or type conversion whose type mark denotes

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  a locally static subtype.


  


  



  

  
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    Re: Error when using with-select-when in VHDL
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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The with-select is a concurrent statement. It cannot be used inside a 
process. Use the case-when instead...

  


  




  

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    Re: Error when using with-select-when in VHDL
  


  

    

      von
      
        Ayush Khemka (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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I did put it outside the process. It can be seen in the code clearly.

  


  




  

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    Re: Error when using with-select-when in VHDL
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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Ayush Khemka wrote:
> It can be seen in the code clearly.
Ok, I see. But then the problem is not in the posted code.

> signal wrptr,rdptr: std_logic_vector(n-1 downto 0);
> Expression must be the name of an object whose subtype is locally static
Where does n come from?

  


  




  

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