EmbDev.net

Forum: FPGA, VHDL & Verilog Procedure in VHDL testbench


Procedure in VHDL testbench
von Bah (Guest)

Rate this post
• ▲ useful
▼ not useful 
Hello there,

I am trying to implement a procedure in my testbench to shorten the 
lenght.

1
entity tb is

2
end entity;

3
4
architecture sim of tb is

5
6
  procedure P_DATA(

7
      constant ctrl  : in std_logic_vector (8 downto 0);

8
      constant ht    : in std_logic_vector (16 downto 0);

9
      constant prd   : in std_logic_vector (16 downto 0))

10
      is

11
      variable i_sctrl  :  std_logic_vector (8 downto 0);

12
      variable i_sprd    :  std_logic_vector (16 downto 0);

13
      variable i_sht     :  std_logic_vector (16 downto 0);

14
 begin

15
     i_sctrl  := ctrl;

16
     i_sprd   := prd;

17
     i_sht    := ht;

18
 end procedure;

19
20
  signal i_clk   : std_logic;

21
  signal i_rst   : std_logic; 

22
  signal i_sctrl : std_logic_vector (8 downto 0);

23
  signal i_sprd  : std_logic_vector (16 downto 0;

24
  Signal i_sht   : std_logic_vector (16 downto 0;

25
  ....

26
27
begin

28
29
  -- Data generation

30
  pr_int : process

31
  begin

32
      

33
      i_rst <= '1';

34
      i_sctrl <= (others => '0');

35
      i_sprd  <= (others => '0');

36
      i_sht   <= (others => '0');

37
      wait for 5 ns;

38
      i_rst <= '0';

39
      wait for 2 ns;

40
      wait for rising_edge(i_clk);

41
      P_DATA(X"04", X"0009",X"000A");

42
      wait for 1 ns;

43
      wait;

44
45
     end process;

46
47
end architecture;


When I simulate to above Code my inputs data are all "zero" all the 
time. How can I modify the procedure to get the set values in the 
simulation waveform

Many thanks

  


  




  

    Report post Edit Move Thread sperren Anmeldepflicht aktivieren Anpinnen Delete topic Thread mit anderem zusammenführen Quote selected text Reply Reply with quote
  







      

      



  

    Re: Procedure in VHDL testbench
  


  

    

      von
      
        Duke Scarring (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

  Rate this post
  

  •
  
  ▲ useful 
  

  ▼ not useful 
  		
  

  


  

      
The signals i_sctrl, i_sprd and i_sht are in a diffrent scope, than the 
variables with the same name inside the procedure.

If you want zu use them, you have to add them to the parameter list:
1
  procedure P_DATA(

2
      constant ctrl  : in std_logic_vector (8 downto 0);

3
      constant ht    : in std_logic_vector (16 downto 0);

4
      constant prd   : in std_logic_vector (16 downto 0);

5
      signal x_sctrl : out std_logic_vector (8 downto 0);

6
      signal x_sprd  : out std_logic_vector (16 downto 0);

7
      signal x_sht   : out std_logic_vector (16 downto 0);

8
)

9
      is

10
 begin

11
     x_sctrl  <= ctrl;

12
     x_sprd   <= prd;

13
     x_sht    <= ht;

14
 end procedure;

15
16
...

17
18
P_DATA(X"04", X"0009",X"000A",i_sctrl,i_sprd,i_sht);


Duke

  


  




  

    Report post Edit Delete Quote selected text Reply Reply with quote
  







      

      



  

    Re: Procedure in VHDL testbench
  


  

    

      von
      
        Bah (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

  Rate this post
  

  •
  
  ▲ useful 
  

  ▼ not useful 
  		
  

  


  

      
Duke Scarring wrote:
> The signals i_sctrl, i_sprd and i_sht are in a diffrent scope,
> than the
> variables with the same name inside the procedure.
>
> If you want zu use them, you have to add them to the parameter list:
> procedure P_DATA(
>       constant ctrl  : in std_logic_vector (8 downto 0);
>       constant ht    : in std_logic_vector (16 downto 0);
>       constant prd   : in std_logic_vector (16 downto 0);
>       signal x_sctrl : out std_logic_vector (8 downto 0);
>       signal x_sprd  : out std_logic_vector (16 downto 0);
>       signal x_sht   : out std_logic_vector (16 downto 0);
> )
>       is
>  begin
>      x_sctrl  <= ctrl;
>      x_sprd   <= prd;
>      x_sht    <= ht;
>  end procedure;
>
> ...
>
> P_DATA(X"04", X"0009",X"000A",i_sctrl,i_sprd,i_sht);
>
> Duke

Hi Duke,

Thanks a lot. It's a exactly what I wanted to do. It works like a charm

Many Thanks

  


  




  

    Report post Edit Delete Quote selected text Reply Reply with quote
  








    

    

       Watch this topic

      |
         Disable multi-page view

    

        


Please log in before posting. Registration is free and takes only a minute.



  Existing account

  


  
  

  
    

      

        
          
        
        
          
        
      

      

        
          
        
        
          
        
      

    


    
    
    





  Do you have a Google/GoogleMail account? No registration required!

  Log in with Google account
  





  No account? Register here.