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Altera_Forum's avatar
Altera_Forum
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13 years ago

Avoid Error 10454 - Integer in RANGE

Hello all together,

I am looking for a solution to avoid the Error 10454.

I know, that this RANGE is not VHDL-conform. 

FUNCTION summe(     
   zahl1    : STD_LOGIC_VECTOR;     
   zahl2    : STD_LOGIC_VECTOR;     
   index    : NATURAL   ) 
RETURN STD_LOGIC_VECTOR IS         
  VARIABLE v_summe      : STD_LOGIC_VECTOR(11 downto 0);
  VARIABLE v_tmp_summe  : STD_LOGIC_VECTOR(11 downto 0);
BEGIN    
   v_tmp_summe := (OTHERS => '0');     
   FOR i IN 0 TO 2 LOOP      
      IF index < 8 THEN        
        v_tmp_summe(zahl1'HIGH+index+i downto index+i) := zahl1;  
        v_summe := v_summe + v_tmp_summe;     
     ELSE        
        EXIT;     
     END IF;     
   END LOOP;     
  RETURN v_summe; 
END;

So I just want to add several times in one clock cycle.

But I have no idea for another solution...

Modelsim have no problem with this code and the simulation runs also fine...

Thanks a lot!

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    How big is zahl1?

    You should initialize v_summe at the beginning of the function too, I don't understand how Modelsim can give you an answer other than XXXXX when you do arithmetics on uninitialized vectors.

    I also assume that you are using the non standard std_logic_(un)signed library. You should consider using numeric_std instead and the signed/unsigned types, this is the recommended way.