Avertissement VHDL Xst: 1293 FF/Latch a une valeur constante de 0

Aucune des réponses sur internet n'a fonctionné pour moi car je suis un débutant en VHDL.Avertissement VHDL Xst: 1293 FF/Latch a une valeur constante de 0

Je crée une interface de mot de passe en vhdl avec des boutons-poussoirs et des voyants. Mon programme simule correctement comme prévu. Fondamentalement, je veux que les LED clignotent lors de la saisie du mauvais mot de passe mais luisent continuellement en entrant le mot de passe correct. Vous pouvez voir, cela fonctionne en simulation.

SIMULATION IMAGE (Dans la simulation premier mot de passe erroné est entré et le mot de passe correct)

Bien que la synthèse, après avertissement principal se produit:

Optimizing unit <safehouse> ... 
WARNING:Xst:1293 - FF/Latch <entry_pass.ncount_6> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_7> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
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. 
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Le code VHDL est:

library IEEE; 
use IEEE.STD_LOGIC_1164.ALL; 

entity safehouse is 
    Port (keyled : out STD_LOGIC_VECTOR(0 TO 4); 
       keypad : in STD_LOGIC_VECTOR(0 to 7); 
       clk : in STD_LOGIC); 
end safehouse; 

architecture safehouse of safehouse is 

signal temp : std_logic_vector(0 to 7) := "00000000"; 

begin 

entry_pass: process(clk,keypad,temp) 

    type integer_vector is array (0 to 3) of integer; 
    variable i : integer := 0; 
    constant passoriginal : integer_vector := (2,5,2,6); 
    variable passcode : integer_vector := (0,0,0,0); 
    variable dcount : integer := 0; 
    variable ncount : integer := 0; 

begin 
    if (rising_edge(clk)) then 

      keyled(4) <= '1'; 

      if i < 4 then 

       keyled(0) <= '1'; 

       if (temp /= keypad) then 
        case keypad is 
         when "10001000" => 
          passcode(i) := 1; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "10000100" => 
          passcode(i) := 2; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "10000010" => 
          passcode(i) := 3; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "10000001" => 
          passcode(i) := 10; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "01001000" => 
          passcode(i) := 4; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "01000100" => 
          passcode(i) := 5; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "01000010" => 
          passcode(i) := 6; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "01000001" => 
          passcode(i) := 11; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00101000" => 
          passcode(i) := 7; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00100100" => 
          passcode(i) := 8; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00100010" => 
          passcode(i) := 9; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00100001" => 
          passcode(i) := 12; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00011000" => 
          passcode(i) := 14; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00010100" => 
          passcode(i) := 0; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00010010" => 
          passcode(i) := 15; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when "00010001" => 
          passcode(i) := 13; 
          keyled(i+1) <= '1'; 
          i := i + 1; 
         when others => 
          keyled(4) <= '1'; 
        end case; 
        temp <= keypad; 
       end if; 

      else 

       if passcode = passoriginal then 

        dcount := dcount + 1; 
        if dcount >= 50000000 then 

         keyled <= ('1','1','1','1','1'); 

         dcount := 1; 
         ncount := ncount + 1; 

         if ncount >= 8 then 

          i := 0; 
          passcode := (0,0,0,0); 
          keyled <= ('0','0','0','0','1'); 

          ncount := 1; 
         end if;  
        end if; 

       else 

        dcount := dcount + 1; 
        if dcount >= 50000000 then 
         if (ncount rem 2) = 0 then 

          keyled <= ('1','1','1','1','1'); 

         else 

          keyled <= ('0','0','0','0','1'); 

         end if; 
         dcount := 1; 
         ncount := ncount + 1; 

         if ncount >= 8 then 

          i := 0; 
          keyled <= ('1','0','0','0','1'); 

          ncount := 1; 
         end if; 
        end if;                    
       end if;  
      end if;    
    end if; 
end process; 

end safehouse;

Je comprends que la variable ncount est en train d'être rognée mais je l'exige. La variable ncount est utilisée pour créer un délai de 4 secondes à l'aide de la variable dcount qui est utilisée pour créer un délai de 0,5 seconde. Sans variable ncount Je ne peux pas créer de délai pendant 4 secondes.

Les avertissements complets sont:

WARNING:Xst:1710 - FF/Latch <keyled_4> (without init value) has a constant value of 1 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 

Optimizing unit <safehouse> ... 
WARNING:Xst:1293 - FF/Latch <entry_pass.ncount_6> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_7> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_8> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_11> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_9> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_10> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_14> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_12> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_13> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_17> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_15> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_16> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_20> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_18> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_19> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_23> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_21> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_22> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_26> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_24> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_25> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_29> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_27> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_28> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_30> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_31> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.dcount_26> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.dcount_29> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.dcount_27> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.dcount_28> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.dcount_30> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.dcount_31> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_3> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_4> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_5> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_6> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_7> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_8> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_9> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_10> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_11> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_12> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_13> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_14> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_15> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_16> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_17> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_18> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_19> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_20> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_21> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_22> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_23> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_24> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_25> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_26> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_27> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_28> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_29> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_30> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.i_31> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_4> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_3> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process. 
WARNING:Xst:1896 - Due to other FF/Latch trimming, FF/Latch <entry_pass.ncount_5> has a constant value of 0 in block <safehouse>. This FF/Latch will be trimmed during the optimization process.

La carte de développement FPGA J'utilise est: Spartan Xilinx 6 XC6SLX9 TQG144. S'il vous plaît, Aidez-moi.

Source

2017-08-11 Pankaj Kumar

Le premier slug de ceux-ci est de déclarer quelque chose comme un entier au lieu d'un entier contraint. entry_pass.ncount a seulement une gamme de 1 à 8. Vous n'avez apparemment pas besoin du reste dans votre code. Pensez logique binaire/numérique et ce que les chiffres signifient.Un entier non contraint est élaboré en synthèse en tant que binaire de 32 bits et représente la valeur du complément à deux bits. Si vous n'utilisez que quatre bits, vous verrez le reste coupé. – user1155120

Copie possible de [Synthèse VHDL - FF/Latch Constant Value] (https://stackoverflow.com/questions/16087307/vhdl-synthesis-ff-latch-constant-value) – user1155120

Merci, @ user1155120 pour votre commentaire, le code dans la réponse que j'ai posté a résolu mon problème. Cependant, vous pouvez nous éclairer avec la raison derrière le code. –

J'ai résolu moi-même ce problème. Merci tout le monde.

Remplacer variables avec des signaux et ajouter CONTRAINTES (leur gamme de valeurs)

Ajout de contraintes aux variables peut résoudre le problème.

Le fait que mon programme était capable de synthétiser sans avertissement après les variables changeant (comme i, dcount, nCount) aux signaux, me fait penser que le problème était Portée de Si Déclaration. Puisque l'opération d'assignation sur les variables était à l'intérieur des instructions if imbriquées, le synthétiseur n'a pas trouvé le changement des valeurs des variables dans la portée requise et a supposé qu'il avait une valeur constante. La portée des signaux est bien meilleure que les variables. CEPENDANT, La raison que j'ai mentionnée ci-dessus peut être fausse car je suis débutant. Mais voici le code qui a résolu mon problème.

library IEEE; 
use IEEE.STD_LOGIC_1164.ALL; 

entity safehouse is 
    Port (keyled : out STD_LOGIC_VECTOR(0 TO 4); 
       keypad : in STD_LOGIC_VECTOR(0 to 7); 
       clk : in STD_LOGIC); 
end safehouse; 

architecture safehouse of safehouse is 

signal temp : std_logic_vector(0 to 7) := "00000000"; 
signal dcount : integer range 0 to 100000000 := 0; 
signal ncount : integer range 0 to 10 := 0; 
signal i : integer range 0 to 5; 

begin 

entry_pass: process(clk,keypad,temp,dcount,ncount,i) 

    type integer_vector is array (0 to 3) of integer; 
    constant passoriginal : integer_vector := (2,5,2,6); 
    variable passcode : integer_vector := (0,0,0,0); 

begin 
    if (rising_edge(clk)) then 

      keyled(4) <= '1'; 

      if i < 4 then 

       keyled(0) <= '1'; 

       if (temp /= keypad) then 
        case keypad is 
         when "10001000" => 
          passcode(i) := 1; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "10000100" => 
          passcode(i) := 2; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "10000010" => 
          passcode(i) := 3; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "10000001" => 
          passcode(i) := 10; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "01001000" => 
          passcode(i) := 4; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "01000100" => 
          passcode(i) := 5; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "01000010" => 
          passcode(i) := 6; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "01000001" => 
          passcode(i) := 11; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00101000" => 
          passcode(i) := 7; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00100100" => 
          passcode(i) := 8; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00100010" => 
          passcode(i) := 9; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00100001" => 
          passcode(i) := 12; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00011000" => 
          passcode(i) := 14; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00010100" => 
          passcode(i) := 0; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00010010" => 
          passcode(i) := 15; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when "00010001" => 
          passcode(i) := 13; 
          keyled(i+1) <= '1'; 
          i <= i + 1; 
         when others => 
          keyled(4) <= '1'; 
        end case; 
        temp <= keypad; 
       end if; 

      else 

       if passcode = passoriginal then 

        dcount <= dcount + 1; 
        if dcount >= 50000000 then 

         keyled <= ('1','1','1','1','1'); 

         dcount <= 1; 
         ncount <= ncount + 1; 

         if ncount >= 8 then 

          i <= 0; 
          passcode := (0,0,0,0); 
          keyled <= ('0','0','0','0','1'); 

          ncount <= 1; 
         end if;  
        end if; 

       else 

        dcount <= dcount + 1; 
        if dcount >= 50000000 then 
         if (ncount rem 2) = 0 then 

          keyled <= ('1','1','1','1','1'); 

         else 

          keyled <= ('0','0','0','0','1'); 

         end if; 
         dcount <= 1; 
         ncount <= ncount + 1; 

         if ncount >= 8 then 

          i <= 0; 
          keyled <= ('1','0','0','0','1'); 

          ncount <= 1; 
         end if; 
        end if;                    
       end if;  
      end if;    
    end if; 
end process; 

end safehouse;

Ceci était ma première question sur ce site. Je vais upvote toutes les réponses. J'ai eu une bonne expérience. Je vous remercie.

Source

2017-08-11 16:49:57

Votre raisonnement pour la raison pour laquelle les avertissements ont disparu ne semble pas valide. Ce n'était pas parce qu'ils étaient des signaux, c'était parce qu'ils étaient contraints, ce que vous auriez pu faire aux variables d'origine. – user1155120

Je pense que vous avez raison. –

Avertissement VHDL Xst: 1293 FF/Latch a une valeur constante de 0

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