EmbDev.net

Forum: FPGA, VHDL & Verilog Altera Quartus Design Assistant Critical Warnings


Altera Quartus Design Assistant Critical Warnings
von Robert (Guest)

Rate this post
• ▲ useful
▼ not useful 
Hallo,

I get a number of Critical Warnings with respect to lpm_ff and 
lpm_counter:

Below are few:

Rule A102: Register output should not drive its own control signal 
directly or through combinational logic - Structure 1
1
App:inst1|Exp_Box:inst2|lpm_ff:ff_Last_Image|dffs[0]

2
App:inst1|Exp_Box:inst2|_~3

3
App:inst1|Exp_Box:inst2|lpm_ff:ff_event_HStrig|dffs[0]

4
5
App:inst1|Expe_Box:inst2|lpm_counter:cnt_ext_HStrig|cntr_6ik:auto_generated|cout_actual

Can these warnings be ignored? Moreover I am using Altera Quartus 11.1 
Web Edition. Could it be because of Open Core Plus?

Regards!

  


  




  

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







      

      



  

    Re: Altera Quartus Design Assistant Critical Warnings
  


  

    

      von
      
        guest (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

  Rate this post
  

  •
  
  ▲ useful 
  

  ▼ not useful 
  		
  

  


  

      
My guess would be that your register output drives its own control 
signal
directly or through combinational logic.

In my experience, Altera IP throws a lot of warnings, but never critical 
without reason.

Design rules for hardware design are not meant to make the code pretty, 
they are there to prevent ugly and unpredictable things from happening. 
So read the warnings and examine your system accordingly.

  


  




  

    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.