Cours:TP M1102 TP 5 Corr : Différence entre versions
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(35 révisions intermédiaires par le même utilisateur non affichées) | |||
Ligne 1 : | Ligne 1 : | ||
+ | |||
=TP 5= | =TP 5= | ||
==Exercice 1== | ==Exercice 1== | ||
Ligne 5 : | Ligne 6 : | ||
==Exercice 2== | ==Exercice 2== | ||
===Question 1=== | ===Question 1=== | ||
+ | On vous présente plusieurs corrections de cet exercice. L'enseignant les présentera toutes ou en choisira quelques unes. | ||
+ | |||
+ | Comme on utilise le même fichier de contraintes dans les trois façons de faire ci-dessous, on vous donne ce fichier ici : | ||
+ | <pre> | ||
+ | To,Direction,Location,I/O Bank,VREF Group,Fitter Location,I/O Standard,Reserved,Current Strength,Slew Rate,Differential Pair,Strict Preservation | ||
+ | |||
+ | clk,Input,PIN_P11,,,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | Leds8[0],Unknown,PIN_A8,7,B7_N0,PIN_A8,3.3-V LVTTL,,,,, | ||
+ | Leds8[1],Unknown,PIN_A9,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[2],Unknown,PIN_A10,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[3],Unknown,PIN_B10,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[4],Unknown,PIN_D13,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[5],Unknown,PIN_C13,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[6],Unknown,PIN_E14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[7],Unknown,PIN_D14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | </pre> | ||
+ | |||
+ | ====Première façon : on fait tout soi-même==== | ||
+ | Le compteur 8 bits utilisé ici était donné dans le TP4. On a simplement modifié le nom de son horloge. | ||
+ | <source lang=VHDL> | ||
+ | -- Testé le 29/09/20 | ||
library IEEE; | library IEEE; | ||
use IEEE.STD_LOGIC_1164.ALL; | use IEEE.STD_LOGIC_1164.ALL; | ||
ENTITY compteur IS PORT ( | ENTITY compteur IS PORT ( | ||
clk: IN std_logic; | clk: IN std_logic; | ||
− | + | Leds8: OUT std_logic_vector(7 downto 0)); | |
END compteur; | END compteur; | ||
ARCHITECTURE arch_compteur OF compteur IS | ARCHITECTURE arch_compteur OF compteur IS | ||
− | -- les | + | -- les composants : |
− | COMPONENT | + | COMPONENT cmpt8bits IS |
− | PORT( | + | PORT(clk : IN STD_LOGIC; |
− | + | cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); | |
− | END COMPONENT | + | END COMPONENT cmpt8bits; |
COMPONENT cmpt24bits IS | COMPONENT cmpt24bits IS | ||
Ligne 24 : | Ligne 47 : | ||
END COMPONENT cmpt24bits; | END COMPONENT cmpt24bits; | ||
-- LE FIL INTENE | -- LE FIL INTENE | ||
− | SIGNAL | + | SIGNAL s_horloge_lente : std_logic; |
BEGIN | BEGIN | ||
i1 : cmpt24bits PORT MAP( | i1 : cmpt24bits PORT MAP( | ||
− | + | clk_50MHz => clk, | |
− | + | clk_slow => s_horloge_lente); | |
− | i2 : | + | i2 : cmpt8bits PORT MAP ( |
− | + | clk => s_horloge_lente, | |
− | + | cnt => leds8); | |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
END arch_compteur; | END arch_compteur; | ||
-- Compteur 8 bits | -- Compteur 8 bits | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt8bits IS | ||
+ | PORT(clk : IN STD_LOGIC; | ||
+ | cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); | ||
+ | END cmpt8bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt8bits OF cmpt8bits IS | ||
+ | signal cmpt : std_logic_vector(7 downto 0); | ||
+ | BEGIN | ||
+ | process(clk) begin | ||
+ | if rising_edge(clk) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | cnt <= cmpt; | ||
+ | END arch_cmpt8bits; | ||
+ | |||
+ | -- horloge lente 3 Hz | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END cmpt24bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS | ||
+ | signal cmpt : std_logic_vector(23 downto 0); | ||
+ | BEGIN | ||
+ | process(clk_50MHz) begin | ||
+ | if rising_edge(clk_50MHz) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | ||
+ | END arch_cmpt24bits; | ||
+ | </source> | ||
+ | |||
+ | ====Deuxième façon : on utilise les LPM==== | ||
+ | |||
+ | En principe les LPM ne sont présentés qu'en question 4. Nous en donnons ici une première utilisation. | ||
+ | <source lang=VHDL> | ||
+ | -- Testé correct le 29/09/20 | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use IEEE.STD_LOGIC_ARITH.ALL; | ||
+ | use IEEE.STD_LOGIC_UNSIGNED.ALL; | ||
+ | LIBRARY lpm; -- for LPM | ||
+ | USE lpm.lpm_components.ALL; | ||
+ | |||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | Leds8: OUT std_logic_vector(7 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | |||
+ | -- LE FIL INTENE | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | |||
+ | BEGIN | ||
+ | -- compteur 24 bits | ||
+ | ic1: lpm_counter GENERIC MAP ( | ||
+ | LPM_WIDTH => 24 | ||
+ | ) | ||
+ | PORT MAP (CLOCK => clk, | ||
+ | q(23) => s_horloge_lente); | ||
+ | -- compteur 8 bits | ||
+ | ic2: lpm_counter GENERIC MAP ( | ||
+ | LPM_WIDTH => 8 | ||
+ | ) | ||
+ | PORT MAP (CLOCK => s_horloge_lente, | ||
+ | q => Leds8); | ||
+ | END arch_compteur; | ||
+ | </source> | ||
+ | |||
+ | '''Remarquez''' comme cette façon de faire est compacte. Mais on va vous présenter encore plus compact dans la suite. | ||
+ | |||
+ | ====Troisième façon : on remarque que le problème est de créer deux compteurs cascdés que l'on peut regrouper==== | ||
+ | <source lang=VHDL> | ||
+ | -- Testé correct le 29/09/20 | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use IEEE.STD_LOGIC_ARITH.ALL; | ||
+ | use IEEE.STD_LOGIC_UNSIGNED.ALL; | ||
+ | LIBRARY lpm; -- for LPM | ||
+ | USE lpm.lpm_components.ALL; | ||
+ | |||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | Leds8: OUT std_logic_vector(7 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | |||
+ | -- LE FIL INTENE | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | |||
+ | BEGIN | ||
+ | -- compteur 24 bits | ||
+ | ic1: lpm_counter GENERIC MAP ( | ||
+ | LPM_WIDTH => 32 | ||
+ | ) | ||
+ | PORT MAP (CLOCK => clk, | ||
+ | q(31 downto 24) => Leds8); | ||
+ | END arch_compteur; | ||
+ | </source> | ||
+ | |||
+ | Non seulement cette façon de faire est la plus compacte, mais en plus c'est elle qui respecte au mieux les règles des horloges dans un FPGA. | ||
+ | |||
+ | ===Question 2 et 3=== | ||
+ | Même s'il est intéressant pédagogiquement de présenter d'abord la question 2 puis la question 3, nous allons faire directement la correction de la question 3. | ||
+ | |||
+ | <source lang=VHDL> | ||
+ | -- Vérifié OK le 29/09/20 | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | HEX0,HEX1: OUT std_logic_vector(6 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | -- les composants : | ||
+ | COMPONENT cmpt8bits IS | ||
+ | PORT(clk : IN STD_LOGIC; | ||
+ | cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); | ||
+ | END COMPONENT cmpt8bits; | ||
+ | |||
+ | COMPONENT cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END COMPONENT cmpt24bits; | ||
+ | |||
+ | COMPONENT transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END COMPONENT transcod7segs; | ||
+ | |||
+ | -- LES FILS INTERNES | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | SIGNAL s_cmpt8 : std_logic_vector(7 downto 0); | ||
+ | BEGIN | ||
+ | i1 : cmpt24bits PORT MAP( | ||
+ | clk_50MHz => clk, | ||
+ | clk_slow => s_horloge_lente); | ||
+ | |||
+ | i2 : cmpt8bits PORT MAP ( | ||
+ | clk => s_horloge_lente, | ||
+ | cnt => s_cmpt8); | ||
+ | i3 : transcod7segs PORT MAP( | ||
+ | e => s_cmpt8(3 DOWNTO 0), | ||
+ | s7segs => HEX0); | ||
+ | i4 : transcod7segs PORT MAP( | ||
+ | e => s_cmpt8(7 DOWNTO 4), | ||
+ | s7segs => HEX1); | ||
+ | END arch_compteur; | ||
+ | |||
+ | -- Compteur 8 bits | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt8bits IS | ||
+ | PORT(clk : IN STD_LOGIC; | ||
+ | cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); | ||
+ | END cmpt8bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt8bits OF cmpt8bits IS | ||
+ | signal cmpt : std_logic_vector(7 downto 0); | ||
+ | BEGIN | ||
+ | process(clk) begin | ||
+ | if rising_edge(clk) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | cnt <= cmpt; | ||
+ | END arch_cmpt8bits; | ||
+ | |||
+ | -- horloge lente 3 Hz | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END cmpt24bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS | ||
+ | signal cmpt : std_logic_vector(23 downto 0); | ||
+ | BEGIN | ||
+ | process(clk_50MHz) begin | ||
+ | if rising_edge(clk_50MHz) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | ||
+ | END arch_cmpt24bits; | ||
+ | |||
+ | -- transcodeur pour affichage 7 segments | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END transcod7segs; | ||
+ | ARCHITECTURE arch of transcod7segs IS | ||
+ | BEGIN | ||
+ | with e select | ||
+ | --gfedcba | ||
+ | s7segs <= "1000000" when "0000", | ||
+ | "1111001" when "0001", | ||
+ | "0100100" when "0010", | ||
+ | "0110000" when "0011", | ||
+ | "0011001" when "0100", | ||
+ | "0010010" when "0101", | ||
+ | "0000010" when "0110", | ||
+ | "1111000" when "0111", | ||
+ | "0000000" when "1000", | ||
+ | "0010000" when "1001", | ||
+ | "0001000" when "1010", | ||
+ | "0000011" when "1011", | ||
+ | "1000110" when "1100", | ||
+ | "0100001" when "1101", | ||
+ | "0000110" when "1110", | ||
+ | "0001110" when others; | ||
+ | END; | ||
+ | </source> | ||
+ | |||
+ | Et avec son fichier de contraintes associé : | ||
+ | <pre> | ||
+ | To,Direction,Location,I/O Bank,VREF Group,Fitter Location,I/O Standard,Reserved,Current Strength,Slew Rate,Differential Pair,Strict Preservation | ||
+ | |||
+ | clk,Input,PIN_P11,,,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | Leds8[0],Unknown,PIN_A8,7,B7_N0,PIN_A8,3.3-V LVTTL,,,,, | ||
+ | Leds8[1],Unknown,PIN_A9,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[2],Unknown,PIN_A10,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[3],Unknown,PIN_B10,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[4],Unknown,PIN_D13,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[5],Unknown,PIN_C13,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[6],Unknown,PIN_E14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[7],Unknown,PIN_D14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | HEX0[0],Unknown,PIN_C14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[1],Unknown,PIN_E15,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[2],Unknown,PIN_C15,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[3],Unknown,PIN_C16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[4],Unknown,PIN_E16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[5],Unknown,PIN_D17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[6],Unknown,PIN_C17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[7],Unknown,PIN_D15,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | HEX1[0],Unknown,PIN_C18,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[1],Unknown,PIN_D18,6,B6_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[2],Unknown,PIN_E18,6,B6_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[3],Unknown,PIN_B16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[4],Unknown,PIN_A17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[5],Unknown,PIN_A18,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[6],Unknown,PIN_B17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[7],Unknown,PIN_A16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | </pre> | ||
+ | |||
+ | ===Question 4=== | ||
+ | La question 4 qui utilise les LPM se trouve corrigée en question 1. Il suffit de remplacer les compteurs 24 et 8 bits par deux LPM ou mieux par un seul de 32 bits dans la correction de la question 3. | ||
+ | |||
+ | ==Exercice 3== | ||
+ | ===Question 1=== | ||
+ | <source lang=vhdl> | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | HEX0: OUT std_logic_vector(6 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | -- les composants : | ||
+ | component CounterBCD is | ||
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | -- ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end component CounterBCD; | ||
+ | |||
+ | COMPONENT cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END COMPONENT cmpt24bits; | ||
+ | |||
+ | COMPONENT transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END COMPONENT transcod7segs; | ||
+ | |||
+ | -- LES FILS INTERNES | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | SIGNAL s_digit0BCD : std_logic_vector(3 downto 0); | ||
+ | BEGIN | ||
+ | i1 : cmpt24bits PORT MAP( | ||
+ | clk_50MHz => clk, | ||
+ | clk_slow => s_horloge_lente); | ||
+ | |||
+ | i2 : CounterBCD PORT MAP ( | ||
+ | EN => '1', | ||
+ | Clock => s_horloge_lente, | ||
+ | Reset => '0', | ||
+ | -- ENO : out std_logic; | ||
+ | Output => s_digit0BCD); | ||
+ | |||
+ | i3 : transcod7segs PORT MAP( | ||
+ | e => s_digit0BCD, | ||
+ | s7segs => HEX0); | ||
+ | END arch_compteur; | ||
+ | |||
+ | -- Compteur 4 bits BCD | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use IEEE.STD_LOGIC_ARITH.ALL; | ||
+ | use IEEE.STD_LOGIC_UNSIGNED.ALL; | ||
+ | |||
+ | entity CounterBCD is | ||
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | -- ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end CounterBCD; | ||
+ | |||
+ | architecture Behavioral of CounterBCD is | ||
+ | signal cmpt: std_logic_vector(3 downto 0); | ||
+ | begin process(Clock,Reset) | ||
+ | begin | ||
+ | if Reset='1' then | ||
+ | cmpt <= "0000"; | ||
+ | elsif(rising_edge(Clock)) then | ||
+ | if EN='1' then | ||
+ | if cmpt="1001" then | ||
+ | cmpt<="0000"; | ||
+ | else | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end if; | ||
+ | end if; | ||
+ | end process; | ||
+ | Output <= cmpt; | ||
+ | end Behavioral; | ||
Ligne 64 : | Ligne 434 : | ||
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | ||
END arch_cmpt24bits; | END arch_cmpt24bits; | ||
+ | |||
+ | -- transcodeur pour affichage 7 segments | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END transcod7segs; | ||
+ | ARCHITECTURE arch of transcod7segs IS | ||
+ | BEGIN | ||
+ | with e select | ||
+ | --gfedcba | ||
+ | s7segs <= "1000000" when "0000", | ||
+ | "1111001" when "0001", | ||
+ | "0100100" when "0010", | ||
+ | "0110000" when "0011", | ||
+ | "0011001" when "0100", | ||
+ | "0010010" when "0101", | ||
+ | "0000010" when "0110", | ||
+ | "1111000" when "0111", | ||
+ | "0000000" when "1000", | ||
+ | "0010000" when "1001", | ||
+ | "0001000" when "1010", | ||
+ | "0000011" when "1011", | ||
+ | "1000110" when "1100", | ||
+ | "0100001" when "1101", | ||
+ | "0000110" when "1110", | ||
+ | "0001110" when others; | ||
+ | END; | ||
+ | </source> | ||
===Question 2=== | ===Question 2=== | ||
+ | Commençons par détailler le compteur BCD cascadable : | ||
+ | <source lang=VHDL> | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use IEEE.STD_LOGIC_ARITH.ALL; | ||
+ | use IEEE.STD_LOGIC_UNSIGNED.ALL; | ||
− | === | + | entity CounterBCD is |
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end CounterBCD; | ||
+ | |||
+ | architecture Behavioral of CounterBCD is | ||
+ | signal cmpt: std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_en_cmpt : std_logic_vector(4 downto 0); | ||
+ | begin | ||
+ | process(Clock,Reset) begin | ||
+ | if Reset='1' then | ||
+ | cmpt <= "0000"; | ||
+ | elsif(rising_edge(Clock)) then | ||
+ | if EN='1' then | ||
+ | if cmpt="1001" then | ||
+ | cmpt<="0000"; | ||
+ | else | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end if; | ||
+ | end if; | ||
+ | end process; | ||
+ | Output <= cmpt; | ||
+ | s_en_cmpt <= en & cmpt; -- operateur '&' est une concatenation | ||
+ | with s_en_cmpt select | ||
+ | ENO <= '1' when "11001", -- EN actif et on est arrivé à (1001)=9 | ||
+ | '0' when others; | ||
+ | end Behavioral; | ||
+ | </source> | ||
+ | La réalisation du compteur BCD cascadable est primordiale et surtout la façon de faire est du VHDL correct. | ||
+ | * présence d'un signal d'entrée '''EN''' qui bloque le fonctionnement du compteur s'il est à 0 | ||
+ | * présence d'un signal de sortie '''ENO''' qui passe à un lorque le compteur est arrivé à 9 (et s'il est autorisé à compter | ||
+ | |||
+ | <big>Cascader des compteurs avec ce type de signaux consiste à relier la sortie '''ENO''' à l'entrée '''EN''' de l'étage suivant.</big> | ||
+ | |||
+ | Venons-en maintenant au programme complet : | ||
+ | |||
+ | <source lang=vhdl> | ||
+ | -- Vérifié OK le 29/09/20 | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | HEX0,HEX1: OUT std_logic_vector(6 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | -- les composants : | ||
+ | component CounterBCD is | ||
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end component CounterBCD; | ||
+ | |||
+ | COMPONENT cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END COMPONENT cmpt24bits; | ||
+ | |||
+ | COMPONENT transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END COMPONENT transcod7segs; | ||
+ | |||
+ | -- LES FILS INTERNES | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | SIGNAL s_digit0BCD : std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_digit1BCD : std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_eno : std_logic; | ||
+ | BEGIN | ||
+ | i1 : cmpt24bits PORT MAP( | ||
+ | clk_50MHz => clk, | ||
+ | clk_slow => s_horloge_lente); | ||
+ | |||
+ | i2 : CounterBCD PORT MAP ( | ||
+ | EN => '1', | ||
+ | Clock => s_horloge_lente, | ||
+ | Reset => '0', | ||
+ | ENO => s_eno, | ||
+ | Output => s_digit0BCD); | ||
+ | i3 : CounterBCD PORT MAP ( | ||
+ | EN => s_eno, | ||
+ | Clock => s_horloge_lente, | ||
+ | Reset => '0', | ||
+ | ENO => open, | ||
+ | Output => s_digit1BCD); | ||
+ | i4 : transcod7segs PORT MAP( | ||
+ | e => s_digit0BCD, | ||
+ | s7segs => HEX0); | ||
+ | i5 : transcod7segs PORT MAP( | ||
+ | e => s_digit1BCD, | ||
+ | s7segs => HEX1); | ||
+ | END arch_compteur; | ||
+ | |||
+ | -- Compteur 4 bits BCD | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use IEEE.STD_LOGIC_ARITH.ALL; | ||
+ | use IEEE.STD_LOGIC_UNSIGNED.ALL; | ||
+ | |||
+ | entity CounterBCD is | ||
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end CounterBCD; | ||
+ | |||
+ | architecture Behavioral of CounterBCD is | ||
+ | signal cmpt: std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_en_cmpt : std_logic_vector(4 downto 0); | ||
+ | begin process(Clock,Reset) | ||
+ | begin | ||
+ | if Reset='1' then | ||
+ | cmpt <= "0000"; | ||
+ | elsif(rising_edge(Clock)) then | ||
+ | if EN='1' then | ||
+ | if cmpt="1001" then | ||
+ | cmpt<="0000"; | ||
+ | else | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end if; | ||
+ | end if; | ||
+ | end process; | ||
+ | Output <= cmpt; | ||
+ | s_en_cmpt <= en & cmpt; -- operateur '&' est une concatenation | ||
+ | with s_en_cmpt select | ||
+ | ENO <= '1' when "11001", | ||
+ | '0' when others; | ||
+ | end Behavioral; | ||
+ | |||
+ | |||
+ | -- horloge lente 3 Hz | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END cmpt24bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS | ||
+ | signal cmpt : std_logic_vector(23 downto 0); | ||
+ | BEGIN | ||
+ | process(clk_50MHz) begin | ||
+ | if rising_edge(clk_50MHz) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | ||
+ | END arch_cmpt24bits; | ||
− | + | -- transcodeur pour affichage 7 segments | |
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END transcod7segs; | ||
+ | ARCHITECTURE arch of transcod7segs IS | ||
+ | BEGIN | ||
+ | with e select | ||
+ | --gfedcba | ||
+ | s7segs <= "1000000" when "0000", | ||
+ | "1111001" when "0001", | ||
+ | "0100100" when "0010", | ||
+ | "0110000" when "0011", | ||
+ | "0011001" when "0100", | ||
+ | "0010010" when "0101", | ||
+ | "0000010" when "0110", | ||
+ | "1111000" when "0111", | ||
+ | "0000000" when "1000", | ||
+ | "0010000" when "1001", | ||
+ | "0001000" when "1010", | ||
+ | "0000011" when "1011", | ||
+ | "1000110" when "1100", | ||
+ | "0100001" when "1101", | ||
+ | "0000110" when "1110", | ||
+ | "0001110" when others; | ||
+ | END; | ||
+ | </source> | ||
==Exercice 4== | ==Exercice 4== | ||
+ | |||
+ | ===Première version : on écrit absolument tout en VHDL=== | ||
+ | |||
+ | Seule la gestion de la sortie '''ENO''' est plus complexe dans un compteur/décompteur. Mais les étudiants disposent d'un lien qui leur donne la solution. Voici donc le programme complet : | ||
+ | |||
+ | <source lang=vhdl> | ||
+ | -- Testé OK le 29/09/20 | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | DU : in std_logic; -- down / up = 0 / 1 | ||
+ | HEX0,HEX1: OUT std_logic_vector(6 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | -- les composants : | ||
+ | component CounterBCD is | ||
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | du: in std_logic; | ||
+ | ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end component CounterBCD; | ||
+ | |||
+ | COMPONENT cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END COMPONENT cmpt24bits; | ||
+ | |||
+ | COMPONENT transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END COMPONENT transcod7segs; | ||
+ | |||
+ | -- LES FILS INTERNES | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | SIGNAL s_digit0BCD : std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_digit1BCD : std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_eno : std_logic; | ||
+ | BEGIN | ||
+ | i1 : cmpt24bits PORT MAP( | ||
+ | clk_50MHz => clk, | ||
+ | clk_slow => s_horloge_lente); | ||
+ | |||
+ | i2 : CounterBCD PORT MAP ( | ||
+ | EN => '1', | ||
+ | du => DU, | ||
+ | Clock => s_horloge_lente, | ||
+ | Reset => '0', | ||
+ | ENO => s_eno, | ||
+ | Output => s_digit0BCD); | ||
+ | i3 : CounterBCD PORT MAP ( | ||
+ | EN => s_eno, | ||
+ | du => DU, | ||
+ | Clock => s_horloge_lente, | ||
+ | Reset => '0', | ||
+ | ENO => open, | ||
+ | Output => s_digit1BCD); | ||
+ | |||
+ | i4 : transcod7segs PORT MAP( | ||
+ | e => s_digit0BCD, | ||
+ | s7segs => HEX0); | ||
+ | i5 : transcod7segs PORT MAP( | ||
+ | e => s_digit1BCD, | ||
+ | s7segs => HEX1); | ||
+ | END arch_compteur; | ||
+ | |||
+ | -- Compteur 4 bits BCD | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use IEEE.STD_LOGIC_ARITH.ALL; | ||
+ | use IEEE.STD_LOGIC_UNSIGNED.ALL; | ||
+ | |||
+ | entity CounterBCD is | ||
+ | port( EN: in std_logic; | ||
+ | Clock: in std_logic; | ||
+ | Reset: in std_logic; | ||
+ | du: in std_logic; | ||
+ | ENO : out std_logic; | ||
+ | Output: out std_logic_vector(3 downto 0)); | ||
+ | end CounterBCD; | ||
+ | |||
+ | architecture Behavioral of CounterBCD is | ||
+ | signal cmpt: std_logic_vector(3 downto 0); | ||
+ | signal s_en_cmpt: std_logic_vector(5 downto 0); | ||
+ | begin process(Clock,Reset) | ||
+ | begin | ||
+ | if Reset='1' then | ||
+ | cmpt <= "0000"; | ||
+ | elsif(rising_edge(Clock)) then | ||
+ | if EN='1' then | ||
+ | if du='1' then | ||
+ | if cmpt="1001" then | ||
+ | cmpt<="0000"; | ||
+ | else | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | else | ||
+ | if cmpt="0000" then | ||
+ | cmpt<="1001"; | ||
+ | else | ||
+ | cmpt <= cmpt - 1; | ||
+ | end if; | ||
+ | end if; | ||
+ | end if; | ||
+ | end if; | ||
+ | end process; | ||
+ | -- sortie du comptage | ||
+ | Output <= cmpt; | ||
+ | -- gestion combinatoire de la sortie ENO | ||
+ | s_en_cmpt <= en & du & cmpt; | ||
+ | with s_en_cmpt select | ||
+ | ENO <= '1' when "111001", | ||
+ | '1' when "100000", | ||
+ | '0' when others; | ||
+ | |||
+ | end Behavioral; | ||
+ | |||
+ | |||
+ | -- horloge lente 3 Hz | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END cmpt24bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS | ||
+ | signal cmpt : std_logic_vector(23 downto 0); | ||
+ | BEGIN | ||
+ | process(clk_50MHz) begin | ||
+ | if rising_edge(clk_50MHz) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | ||
+ | END arch_cmpt24bits; | ||
+ | |||
+ | -- transcodeur pour affichage 7 segments | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END transcod7segs; | ||
+ | ARCHITECTURE arch of transcod7segs IS | ||
+ | BEGIN | ||
+ | with e select | ||
+ | --gfedcba | ||
+ | s7segs <= "1000000" when "0000", | ||
+ | "1111001" when "0001", | ||
+ | "0100100" when "0010", | ||
+ | "0110000" when "0011", | ||
+ | "0011001" when "0100", | ||
+ | "0010010" when "0101", | ||
+ | "0000010" when "0110", | ||
+ | "1111000" when "0111", | ||
+ | "0000000" when "1000", | ||
+ | "0010000" when "1001", | ||
+ | "0001000" when "1010", | ||
+ | "0000011" when "1011", | ||
+ | "1000110" when "1100", | ||
+ | "0100001" when "1101", | ||
+ | "0000110" when "1110", | ||
+ | "0001110" when others; | ||
+ | END; | ||
+ | </source> | ||
+ | |||
+ | ainsi que le fichier de contraintes associé : | ||
+ | <pre> | ||
+ | To,Direction,Location,I/O Bank,VREF Group,Fitter Location,I/O Standard,Reserved,Current Strength,Slew Rate,Differential Pair,Strict Preservation | ||
+ | |||
+ | clk,Input,PIN_P11,,,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | DU,Input,PIN_C10,7,B7_N0,PIN_C10,3.3-V LVTTL,,,,, | ||
+ | |||
+ | Leds8[0],Unknown,PIN_A8,7,B7_N0,PIN_A8,3.3-V LVTTL,,,,, | ||
+ | Leds8[1],Unknown,PIN_A9,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[2],Unknown,PIN_A10,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[3],Unknown,PIN_B10,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[4],Unknown,PIN_D13,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[5],Unknown,PIN_C13,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[6],Unknown,PIN_E14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | Leds8[7],Unknown,PIN_D14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | HEX0[0],Unknown,PIN_C14,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[1],Unknown,PIN_E15,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[2],Unknown,PIN_C15,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[3],Unknown,PIN_C16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[4],Unknown,PIN_E16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[5],Unknown,PIN_D17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX0[6],Unknown,PIN_C17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | |||
+ | HEX1[0],Unknown,PIN_C18,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[1],Unknown,PIN_D18,6,B6_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[2],Unknown,PIN_E18,6,B6_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[3],Unknown,PIN_B16,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[4],Unknown,PIN_A17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[5],Unknown,PIN_A18,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | HEX1[6],Unknown,PIN_B17,7,B7_N0,,3.3-V LVTTL,,,,, | ||
+ | </pre> | ||
+ | |||
+ | ===Deuxième version en LPM=== | ||
+ | L'utilisation des LPM pour faire compteur décompteur est simple. Mais pour les cascader vous êtes obligé de faire un travail combinatoire par vous-même. Ce qui diminue franchement sa simplicité. | ||
+ | |||
+ | Voici le programme en LPM BCD (uniquement pour les compteur BCD): | ||
+ | <source lang = VHDL> | ||
+ | -- testé OK le 29/09/20 | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | LIBRARY lpm; -- for LPM | ||
+ | USE lpm.lpm_components.ALL; | ||
+ | |||
+ | ENTITY compteur IS PORT ( | ||
+ | clk: IN std_logic; | ||
+ | DU : in std_logic; -- down / up = 0 / 1 | ||
+ | EN : in std_logic; | ||
+ | HEX0,HEX1: OUT std_logic_vector(6 downto 0)); | ||
+ | END compteur; | ||
+ | |||
+ | ARCHITECTURE arch_compteur OF compteur IS | ||
+ | |||
+ | -- les composants : | ||
+ | COMPONENT cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END COMPONENT cmpt24bits; | ||
+ | |||
+ | COMPONENT transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END COMPONENT transcod7segs; | ||
+ | |||
+ | -- LES FILS INTERNES | ||
+ | SIGNAL s_horloge_lente : std_logic; | ||
+ | SIGNAL s_digit0BCD : std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_digit1BCD : std_logic_vector(3 downto 0); | ||
+ | signal s_en_cmpt: std_logic_vector(3 downto 0); | ||
+ | SIGNAL s_eno,s_eno0, s_eno9 : std_logic; | ||
+ | BEGIN | ||
+ | i1 : cmpt24bits PORT MAP( | ||
+ | clk_50MHz => clk, | ||
+ | clk_slow => s_horloge_lente); | ||
+ | i2 : lpm_counter GENERIC MAP ( | ||
+ | LPM_WIDTH => 4, | ||
+ | LPM_MODULUS => 10 -- pour BCD | ||
+ | ) | ||
+ | PORT MAP ( | ||
+ | CLOCK => s_horloge_lente, | ||
+ | updown => DU, | ||
+ | cnt_en => EN, | ||
+ | eq(9) => s_eno9, -- détection de la valeur 9 | ||
+ | eq(0) => s_eno0, -- détection de la valeur 0 | ||
+ | q => s_digit0BCD); | ||
+ | |||
+ | -- **** voici le calcul combinatoire à faire pour cascader : ***** | ||
+ | s_en_cmpt <= en & DU & s_eno9 & s_eno0; | ||
+ | with s_en_cmpt select | ||
+ | s_eno <= '1' when "1110", | ||
+ | '1' when "1001", | ||
+ | '0' when others; | ||
+ | -- fin du calcul | ||
+ | i3 : lpm_counter GENERIC MAP ( | ||
+ | LPM_WIDTH => 4, | ||
+ | LPM_MODULUS => 10 -- pour BCD | ||
+ | ) | ||
+ | PORT MAP ( | ||
+ | CLOCK => s_horloge_lente, | ||
+ | cnt_en => s_eno, | ||
+ | updown => DU, | ||
+ | q => s_digit1BCD); | ||
+ | |||
+ | i4 : transcod7segs PORT MAP( | ||
+ | e => s_digit0BCD, | ||
+ | s7segs => HEX0); | ||
+ | i5 : transcod7segs PORT MAP( | ||
+ | e => s_digit1BCD, | ||
+ | s7segs => HEX1); | ||
+ | END arch_compteur; | ||
+ | |||
+ | -- horloge lente 3 Hz | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | use ieee.std_logic_arith.all; | ||
+ | use ieee.std_logic_unsigned.all; | ||
+ | ENTITY cmpt24bits IS | ||
+ | PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée | ||
+ | clk_slow : OUT STD_LOGIC); -- une seule sortie | ||
+ | END cmpt24bits; | ||
+ | |||
+ | ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS | ||
+ | signal cmpt : std_logic_vector(23 downto 0); | ||
+ | BEGIN | ||
+ | process(clk_50MHz) begin | ||
+ | if rising_edge(clk_50MHz) then | ||
+ | cmpt <= cmpt + 1; | ||
+ | end if; | ||
+ | end process; | ||
+ | clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente | ||
+ | END arch_cmpt24bits; | ||
+ | |||
+ | -- transcodeur pour affichage 7 segments | ||
+ | library IEEE; | ||
+ | use IEEE.STD_LOGIC_1164.ALL; | ||
+ | ENTITY transcod7segs IS PORT( | ||
+ | e : in std_logic_vector(3 downto 0); | ||
+ | s7segs : out std_logic_vector(6 downto 0)); | ||
+ | END transcod7segs; | ||
+ | ARCHITECTURE arch of transcod7segs IS | ||
+ | BEGIN | ||
+ | with e select | ||
+ | --gfedcba | ||
+ | s7segs <= "1000000" when "0000", | ||
+ | "1111001" when "0001", | ||
+ | "0100100" when "0010", | ||
+ | "0110000" when "0011", | ||
+ | "0011001" when "0100", | ||
+ | "0010010" when "0101", | ||
+ | "0000010" when "0110", | ||
+ | "1111000" when "0111", | ||
+ | "0000000" when "1000", | ||
+ | "0010000" when "1001", | ||
+ | "0001000" when "1010", | ||
+ | "0000011" when "1011", | ||
+ | "1000110" when "1100", | ||
+ | "0100001" when "1101", | ||
+ | "0000110" when "1110", | ||
+ | "0001110" when others; | ||
+ | END; | ||
+ | </source> | ||
+ | |||
+ | On a ajouté la ligne : | ||
+ | <pre> | ||
+ | EN,Unknown,PIN_C11,7,B7_N0,PIN_C11,3.3-V LVTTL,,,,, | ||
+ | </pre> | ||
+ | aux contraintes. |
Version actuelle datée du 21 juillet 2021 à 13:55
TP 5
Exercice 1
L'exercice 1 a déjà été corrigé dans Corrigé du TP4 (Exercice 4). Il ne sera donc réalisé en TP5 que s'il ne l'a pas été en TP 4.
Exercice 2
Question 1
On vous présente plusieurs corrections de cet exercice. L'enseignant les présentera toutes ou en choisira quelques unes.
Comme on utilise le même fichier de contraintes dans les trois façons de faire ci-dessous, on vous donne ce fichier ici :
To,Direction,Location,I/O Bank,VREF Group,Fitter Location,I/O Standard,Reserved,Current Strength,Slew Rate,Differential Pair,Strict Preservation clk,Input,PIN_P11,,,,3.3-V LVTTL,,,,, Leds8[0],Unknown,PIN_A8,7,B7_N0,PIN_A8,3.3-V LVTTL,,,,, Leds8[1],Unknown,PIN_A9,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[2],Unknown,PIN_A10,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[3],Unknown,PIN_B10,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[4],Unknown,PIN_D13,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[5],Unknown,PIN_C13,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[6],Unknown,PIN_E14,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[7],Unknown,PIN_D14,7,B7_N0,,3.3-V LVTTL,,,,,
Première façon : on fait tout soi-même
Le compteur 8 bits utilisé ici était donné dans le TP4. On a simplement modifié le nom de son horloge.
-- Testé le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
Leds8: OUT std_logic_vector(7 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- les composants :
COMPONENT cmpt8bits IS
PORT(clk : IN STD_LOGIC;
cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END COMPONENT cmpt8bits;
COMPONENT cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END COMPONENT cmpt24bits;
-- LE FIL INTENE
SIGNAL s_horloge_lente : std_logic;
BEGIN
i1 : cmpt24bits PORT MAP(
clk_50MHz => clk,
clk_slow => s_horloge_lente);
i2 : cmpt8bits PORT MAP (
clk => s_horloge_lente,
cnt => leds8);
END arch_compteur;
-- Compteur 8 bits
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt8bits IS
PORT(clk : IN STD_LOGIC;
cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END cmpt8bits;
ARCHITECTURE arch_cmpt8bits OF cmpt8bits IS
signal cmpt : std_logic_vector(7 downto 0);
BEGIN
process(clk) begin
if rising_edge(clk) then
cmpt <= cmpt + 1;
end if;
end process;
cnt <= cmpt;
END arch_cmpt8bits;
-- horloge lente 3 Hz
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END cmpt24bits;
ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS
signal cmpt : std_logic_vector(23 downto 0);
BEGIN
process(clk_50MHz) begin
if rising_edge(clk_50MHz) then
cmpt <= cmpt + 1;
end if;
end process;
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente
END arch_cmpt24bits;
Deuxième façon : on utilise les LPM
En principe les LPM ne sont présentés qu'en question 4. Nous en donnons ici une première utilisation.
-- Testé correct le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
LIBRARY lpm; -- for LPM
USE lpm.lpm_components.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
Leds8: OUT std_logic_vector(7 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- LE FIL INTENE
SIGNAL s_horloge_lente : std_logic;
BEGIN
-- compteur 24 bits
ic1: lpm_counter GENERIC MAP (
LPM_WIDTH => 24
)
PORT MAP (CLOCK => clk,
q(23) => s_horloge_lente);
-- compteur 8 bits
ic2: lpm_counter GENERIC MAP (
LPM_WIDTH => 8
)
PORT MAP (CLOCK => s_horloge_lente,
q => Leds8);
END arch_compteur;
Remarquez comme cette façon de faire est compacte. Mais on va vous présenter encore plus compact dans la suite.
Troisième façon : on remarque que le problème est de créer deux compteurs cascdés que l'on peut regrouper
-- Testé correct le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
LIBRARY lpm; -- for LPM
USE lpm.lpm_components.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
Leds8: OUT std_logic_vector(7 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- LE FIL INTENE
SIGNAL s_horloge_lente : std_logic;
BEGIN
-- compteur 24 bits
ic1: lpm_counter GENERIC MAP (
LPM_WIDTH => 32
)
PORT MAP (CLOCK => clk,
q(31 downto 24) => Leds8);
END arch_compteur;
Non seulement cette façon de faire est la plus compacte, mais en plus c'est elle qui respecte au mieux les règles des horloges dans un FPGA.
Question 2 et 3
Même s'il est intéressant pédagogiquement de présenter d'abord la question 2 puis la question 3, nous allons faire directement la correction de la question 3.
-- Vérifié OK le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
HEX0,HEX1: OUT std_logic_vector(6 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- les composants :
COMPONENT cmpt8bits IS
PORT(clk : IN STD_LOGIC;
cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END COMPONENT cmpt8bits;
COMPONENT cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END COMPONENT cmpt24bits;
COMPONENT transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END COMPONENT transcod7segs;
-- LES FILS INTERNES
SIGNAL s_horloge_lente : std_logic;
SIGNAL s_cmpt8 : std_logic_vector(7 downto 0);
BEGIN
i1 : cmpt24bits PORT MAP(
clk_50MHz => clk,
clk_slow => s_horloge_lente);
i2 : cmpt8bits PORT MAP (
clk => s_horloge_lente,
cnt => s_cmpt8);
i3 : transcod7segs PORT MAP(
e => s_cmpt8(3 DOWNTO 0),
s7segs => HEX0);
i4 : transcod7segs PORT MAP(
e => s_cmpt8(7 DOWNTO 4),
s7segs => HEX1);
END arch_compteur;
-- Compteur 8 bits
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt8bits IS
PORT(clk : IN STD_LOGIC;
cnt : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));
END cmpt8bits;
ARCHITECTURE arch_cmpt8bits OF cmpt8bits IS
signal cmpt : std_logic_vector(7 downto 0);
BEGIN
process(clk) begin
if rising_edge(clk) then
cmpt <= cmpt + 1;
end if;
end process;
cnt <= cmpt;
END arch_cmpt8bits;
-- horloge lente 3 Hz
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END cmpt24bits;
ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS
signal cmpt : std_logic_vector(23 downto 0);
BEGIN
process(clk_50MHz) begin
if rising_edge(clk_50MHz) then
cmpt <= cmpt + 1;
end if;
end process;
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente
END arch_cmpt24bits;
-- transcodeur pour affichage 7 segments
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END transcod7segs;
ARCHITECTURE arch of transcod7segs IS
BEGIN
with e select
--gfedcba
s7segs <= "1000000" when "0000",
"1111001" when "0001",
"0100100" when "0010",
"0110000" when "0011",
"0011001" when "0100",
"0010010" when "0101",
"0000010" when "0110",
"1111000" when "0111",
"0000000" when "1000",
"0010000" when "1001",
"0001000" when "1010",
"0000011" when "1011",
"1000110" when "1100",
"0100001" when "1101",
"0000110" when "1110",
"0001110" when others;
END;
Et avec son fichier de contraintes associé :
To,Direction,Location,I/O Bank,VREF Group,Fitter Location,I/O Standard,Reserved,Current Strength,Slew Rate,Differential Pair,Strict Preservation clk,Input,PIN_P11,,,,3.3-V LVTTL,,,,, Leds8[0],Unknown,PIN_A8,7,B7_N0,PIN_A8,3.3-V LVTTL,,,,, Leds8[1],Unknown,PIN_A9,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[2],Unknown,PIN_A10,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[3],Unknown,PIN_B10,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[4],Unknown,PIN_D13,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[5],Unknown,PIN_C13,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[6],Unknown,PIN_E14,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[7],Unknown,PIN_D14,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[0],Unknown,PIN_C14,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[1],Unknown,PIN_E15,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[2],Unknown,PIN_C15,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[3],Unknown,PIN_C16,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[4],Unknown,PIN_E16,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[5],Unknown,PIN_D17,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[6],Unknown,PIN_C17,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[7],Unknown,PIN_D15,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[0],Unknown,PIN_C18,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[1],Unknown,PIN_D18,6,B6_N0,,3.3-V LVTTL,,,,, HEX1[2],Unknown,PIN_E18,6,B6_N0,,3.3-V LVTTL,,,,, HEX1[3],Unknown,PIN_B16,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[4],Unknown,PIN_A17,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[5],Unknown,PIN_A18,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[6],Unknown,PIN_B17,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[7],Unknown,PIN_A16,7,B7_N0,,3.3-V LVTTL,,,,,
Question 4
La question 4 qui utilise les LPM se trouve corrigée en question 1. Il suffit de remplacer les compteurs 24 et 8 bits par deux LPM ou mieux par un seul de 32 bits dans la correction de la question 3.
Exercice 3
Question 1
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
HEX0: OUT std_logic_vector(6 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- les composants :
component CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
-- ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end component CounterBCD;
COMPONENT cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END COMPONENT cmpt24bits;
COMPONENT transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END COMPONENT transcod7segs;
-- LES FILS INTERNES
SIGNAL s_horloge_lente : std_logic;
SIGNAL s_digit0BCD : std_logic_vector(3 downto 0);
BEGIN
i1 : cmpt24bits PORT MAP(
clk_50MHz => clk,
clk_slow => s_horloge_lente);
i2 : CounterBCD PORT MAP (
EN => '1',
Clock => s_horloge_lente,
Reset => '0',
-- ENO : out std_logic;
Output => s_digit0BCD);
i3 : transcod7segs PORT MAP(
e => s_digit0BCD,
s7segs => HEX0);
END arch_compteur;
-- Compteur 4 bits BCD
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
-- ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end CounterBCD;
architecture Behavioral of CounterBCD is
signal cmpt: std_logic_vector(3 downto 0);
begin process(Clock,Reset)
begin
if Reset='1' then
cmpt <= "0000";
elsif(rising_edge(Clock)) then
if EN='1' then
if cmpt="1001" then
cmpt<="0000";
else
cmpt <= cmpt + 1;
end if;
end if;
end if;
end process;
Output <= cmpt;
end Behavioral;
-- horloge lente 3 Hz
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END cmpt24bits;
ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS
signal cmpt : std_logic_vector(23 downto 0);
BEGIN
process(clk_50MHz) begin
if rising_edge(clk_50MHz) then
cmpt <= cmpt + 1;
end if;
end process;
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente
END arch_cmpt24bits;
-- transcodeur pour affichage 7 segments
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END transcod7segs;
ARCHITECTURE arch of transcod7segs IS
BEGIN
with e select
--gfedcba
s7segs <= "1000000" when "0000",
"1111001" when "0001",
"0100100" when "0010",
"0110000" when "0011",
"0011001" when "0100",
"0010010" when "0101",
"0000010" when "0110",
"1111000" when "0111",
"0000000" when "1000",
"0010000" when "1001",
"0001000" when "1010",
"0000011" when "1011",
"1000110" when "1100",
"0100001" when "1101",
"0000110" when "1110",
"0001110" when others;
END;
Question 2
Commençons par détailler le compteur BCD cascadable :
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end CounterBCD;
architecture Behavioral of CounterBCD is
signal cmpt: std_logic_vector(3 downto 0);
SIGNAL s_en_cmpt : std_logic_vector(4 downto 0);
begin
process(Clock,Reset) begin
if Reset='1' then
cmpt <= "0000";
elsif(rising_edge(Clock)) then
if EN='1' then
if cmpt="1001" then
cmpt<="0000";
else
cmpt <= cmpt + 1;
end if;
end if;
end if;
end process;
Output <= cmpt;
s_en_cmpt <= en & cmpt; -- operateur '&' est une concatenation
with s_en_cmpt select
ENO <= '1' when "11001", -- EN actif et on est arrivé à (1001)=9
'0' when others;
end Behavioral;
La réalisation du compteur BCD cascadable est primordiale et surtout la façon de faire est du VHDL correct.
- présence d'un signal d'entrée EN qui bloque le fonctionnement du compteur s'il est à 0
- présence d'un signal de sortie ENO qui passe à un lorque le compteur est arrivé à 9 (et s'il est autorisé à compter
Cascader des compteurs avec ce type de signaux consiste à relier la sortie ENO à l'entrée EN de l'étage suivant.
Venons-en maintenant au programme complet :
-- Vérifié OK le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
HEX0,HEX1: OUT std_logic_vector(6 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- les composants :
component CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end component CounterBCD;
COMPONENT cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END COMPONENT cmpt24bits;
COMPONENT transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END COMPONENT transcod7segs;
-- LES FILS INTERNES
SIGNAL s_horloge_lente : std_logic;
SIGNAL s_digit0BCD : std_logic_vector(3 downto 0);
SIGNAL s_digit1BCD : std_logic_vector(3 downto 0);
SIGNAL s_eno : std_logic;
BEGIN
i1 : cmpt24bits PORT MAP(
clk_50MHz => clk,
clk_slow => s_horloge_lente);
i2 : CounterBCD PORT MAP (
EN => '1',
Clock => s_horloge_lente,
Reset => '0',
ENO => s_eno,
Output => s_digit0BCD);
i3 : CounterBCD PORT MAP (
EN => s_eno,
Clock => s_horloge_lente,
Reset => '0',
ENO => open,
Output => s_digit1BCD);
i4 : transcod7segs PORT MAP(
e => s_digit0BCD,
s7segs => HEX0);
i5 : transcod7segs PORT MAP(
e => s_digit1BCD,
s7segs => HEX1);
END arch_compteur;
-- Compteur 4 bits BCD
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end CounterBCD;
architecture Behavioral of CounterBCD is
signal cmpt: std_logic_vector(3 downto 0);
SIGNAL s_en_cmpt : std_logic_vector(4 downto 0);
begin process(Clock,Reset)
begin
if Reset='1' then
cmpt <= "0000";
elsif(rising_edge(Clock)) then
if EN='1' then
if cmpt="1001" then
cmpt<="0000";
else
cmpt <= cmpt + 1;
end if;
end if;
end if;
end process;
Output <= cmpt;
s_en_cmpt <= en & cmpt; -- operateur '&' est une concatenation
with s_en_cmpt select
ENO <= '1' when "11001",
'0' when others;
end Behavioral;
-- horloge lente 3 Hz
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END cmpt24bits;
ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS
signal cmpt : std_logic_vector(23 downto 0);
BEGIN
process(clk_50MHz) begin
if rising_edge(clk_50MHz) then
cmpt <= cmpt + 1;
end if;
end process;
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente
END arch_cmpt24bits;
-- transcodeur pour affichage 7 segments
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END transcod7segs;
ARCHITECTURE arch of transcod7segs IS
BEGIN
with e select
--gfedcba
s7segs <= "1000000" when "0000",
"1111001" when "0001",
"0100100" when "0010",
"0110000" when "0011",
"0011001" when "0100",
"0010010" when "0101",
"0000010" when "0110",
"1111000" when "0111",
"0000000" when "1000",
"0010000" when "1001",
"0001000" when "1010",
"0000011" when "1011",
"1000110" when "1100",
"0100001" when "1101",
"0000110" when "1110",
"0001110" when others;
END;
Exercice 4
Première version : on écrit absolument tout en VHDL
Seule la gestion de la sortie ENO est plus complexe dans un compteur/décompteur. Mais les étudiants disposent d'un lien qui leur donne la solution. Voici donc le programme complet :
-- Testé OK le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
DU : in std_logic; -- down / up = 0 / 1
HEX0,HEX1: OUT std_logic_vector(6 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- les composants :
component CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
du: in std_logic;
ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end component CounterBCD;
COMPONENT cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END COMPONENT cmpt24bits;
COMPONENT transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END COMPONENT transcod7segs;
-- LES FILS INTERNES
SIGNAL s_horloge_lente : std_logic;
SIGNAL s_digit0BCD : std_logic_vector(3 downto 0);
SIGNAL s_digit1BCD : std_logic_vector(3 downto 0);
SIGNAL s_eno : std_logic;
BEGIN
i1 : cmpt24bits PORT MAP(
clk_50MHz => clk,
clk_slow => s_horloge_lente);
i2 : CounterBCD PORT MAP (
EN => '1',
du => DU,
Clock => s_horloge_lente,
Reset => '0',
ENO => s_eno,
Output => s_digit0BCD);
i3 : CounterBCD PORT MAP (
EN => s_eno,
du => DU,
Clock => s_horloge_lente,
Reset => '0',
ENO => open,
Output => s_digit1BCD);
i4 : transcod7segs PORT MAP(
e => s_digit0BCD,
s7segs => HEX0);
i5 : transcod7segs PORT MAP(
e => s_digit1BCD,
s7segs => HEX1);
END arch_compteur;
-- Compteur 4 bits BCD
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity CounterBCD is
port( EN: in std_logic;
Clock: in std_logic;
Reset: in std_logic;
du: in std_logic;
ENO : out std_logic;
Output: out std_logic_vector(3 downto 0));
end CounterBCD;
architecture Behavioral of CounterBCD is
signal cmpt: std_logic_vector(3 downto 0);
signal s_en_cmpt: std_logic_vector(5 downto 0);
begin process(Clock,Reset)
begin
if Reset='1' then
cmpt <= "0000";
elsif(rising_edge(Clock)) then
if EN='1' then
if du='1' then
if cmpt="1001" then
cmpt<="0000";
else
cmpt <= cmpt + 1;
end if;
else
if cmpt="0000" then
cmpt<="1001";
else
cmpt <= cmpt - 1;
end if;
end if;
end if;
end if;
end process;
-- sortie du comptage
Output <= cmpt;
-- gestion combinatoire de la sortie ENO
s_en_cmpt <= en & du & cmpt;
with s_en_cmpt select
ENO <= '1' when "111001",
'1' when "100000",
'0' when others;
end Behavioral;
-- horloge lente 3 Hz
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END cmpt24bits;
ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS
signal cmpt : std_logic_vector(23 downto 0);
BEGIN
process(clk_50MHz) begin
if rising_edge(clk_50MHz) then
cmpt <= cmpt + 1;
end if;
end process;
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente
END arch_cmpt24bits;
-- transcodeur pour affichage 7 segments
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END transcod7segs;
ARCHITECTURE arch of transcod7segs IS
BEGIN
with e select
--gfedcba
s7segs <= "1000000" when "0000",
"1111001" when "0001",
"0100100" when "0010",
"0110000" when "0011",
"0011001" when "0100",
"0010010" when "0101",
"0000010" when "0110",
"1111000" when "0111",
"0000000" when "1000",
"0010000" when "1001",
"0001000" when "1010",
"0000011" when "1011",
"1000110" when "1100",
"0100001" when "1101",
"0000110" when "1110",
"0001110" when others;
END;
ainsi que le fichier de contraintes associé :
To,Direction,Location,I/O Bank,VREF Group,Fitter Location,I/O Standard,Reserved,Current Strength,Slew Rate,Differential Pair,Strict Preservation clk,Input,PIN_P11,,,,3.3-V LVTTL,,,,, DU,Input,PIN_C10,7,B7_N0,PIN_C10,3.3-V LVTTL,,,,, Leds8[0],Unknown,PIN_A8,7,B7_N0,PIN_A8,3.3-V LVTTL,,,,, Leds8[1],Unknown,PIN_A9,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[2],Unknown,PIN_A10,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[3],Unknown,PIN_B10,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[4],Unknown,PIN_D13,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[5],Unknown,PIN_C13,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[6],Unknown,PIN_E14,7,B7_N0,,3.3-V LVTTL,,,,, Leds8[7],Unknown,PIN_D14,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[0],Unknown,PIN_C14,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[1],Unknown,PIN_E15,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[2],Unknown,PIN_C15,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[3],Unknown,PIN_C16,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[4],Unknown,PIN_E16,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[5],Unknown,PIN_D17,7,B7_N0,,3.3-V LVTTL,,,,, HEX0[6],Unknown,PIN_C17,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[0],Unknown,PIN_C18,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[1],Unknown,PIN_D18,6,B6_N0,,3.3-V LVTTL,,,,, HEX1[2],Unknown,PIN_E18,6,B6_N0,,3.3-V LVTTL,,,,, HEX1[3],Unknown,PIN_B16,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[4],Unknown,PIN_A17,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[5],Unknown,PIN_A18,7,B7_N0,,3.3-V LVTTL,,,,, HEX1[6],Unknown,PIN_B17,7,B7_N0,,3.3-V LVTTL,,,,,
Deuxième version en LPM
L'utilisation des LPM pour faire compteur décompteur est simple. Mais pour les cascader vous êtes obligé de faire un travail combinatoire par vous-même. Ce qui diminue franchement sa simplicité.
Voici le programme en LPM BCD (uniquement pour les compteur BCD):
-- testé OK le 29/09/20
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
LIBRARY lpm; -- for LPM
USE lpm.lpm_components.ALL;
ENTITY compteur IS PORT (
clk: IN std_logic;
DU : in std_logic; -- down / up = 0 / 1
EN : in std_logic;
HEX0,HEX1: OUT std_logic_vector(6 downto 0));
END compteur;
ARCHITECTURE arch_compteur OF compteur IS
-- les composants :
COMPONENT cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END COMPONENT cmpt24bits;
COMPONENT transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END COMPONENT transcod7segs;
-- LES FILS INTERNES
SIGNAL s_horloge_lente : std_logic;
SIGNAL s_digit0BCD : std_logic_vector(3 downto 0);
SIGNAL s_digit1BCD : std_logic_vector(3 downto 0);
signal s_en_cmpt: std_logic_vector(3 downto 0);
SIGNAL s_eno,s_eno0, s_eno9 : std_logic;
BEGIN
i1 : cmpt24bits PORT MAP(
clk_50MHz => clk,
clk_slow => s_horloge_lente);
i2 : lpm_counter GENERIC MAP (
LPM_WIDTH => 4,
LPM_MODULUS => 10 -- pour BCD
)
PORT MAP (
CLOCK => s_horloge_lente,
updown => DU,
cnt_en => EN,
eq(9) => s_eno9, -- détection de la valeur 9
eq(0) => s_eno0, -- détection de la valeur 0
q => s_digit0BCD);
-- **** voici le calcul combinatoire à faire pour cascader : *****
s_en_cmpt <= en & DU & s_eno9 & s_eno0;
with s_en_cmpt select
s_eno <= '1' when "1110",
'1' when "1001",
'0' when others;
-- fin du calcul
i3 : lpm_counter GENERIC MAP (
LPM_WIDTH => 4,
LPM_MODULUS => 10 -- pour BCD
)
PORT MAP (
CLOCK => s_horloge_lente,
cnt_en => s_eno,
updown => DU,
q => s_digit1BCD);
i4 : transcod7segs PORT MAP(
e => s_digit0BCD,
s7segs => HEX0);
i5 : transcod7segs PORT MAP(
e => s_digit1BCD,
s7segs => HEX1);
END arch_compteur;
-- horloge lente 3 Hz
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY cmpt24bits IS
PORT(clk_50MHz : IN STD_LOGIC; -- une seule entrée
clk_slow : OUT STD_LOGIC); -- une seule sortie
END cmpt24bits;
ARCHITECTURE arch_cmpt24bits OF cmpt24bits IS
signal cmpt : std_logic_vector(23 downto 0);
BEGIN
process(clk_50MHz) begin
if rising_edge(clk_50MHz) then
cmpt <= cmpt + 1;
end if;
end process;
clk_slow <= cmpt(23); -- partie combinatoire de construction de l'horloge lente
END arch_cmpt24bits;
-- transcodeur pour affichage 7 segments
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
ENTITY transcod7segs IS PORT(
e : in std_logic_vector(3 downto 0);
s7segs : out std_logic_vector(6 downto 0));
END transcod7segs;
ARCHITECTURE arch of transcod7segs IS
BEGIN
with e select
--gfedcba
s7segs <= "1000000" when "0000",
"1111001" when "0001",
"0100100" when "0010",
"0110000" when "0011",
"0011001" when "0100",
"0010010" when "0101",
"0000010" when "0110",
"1111000" when "0111",
"0000000" when "1000",
"0010000" when "1001",
"0001000" when "1010",
"0000011" when "1011",
"1000110" when "1100",
"0100001" when "1101",
"0000110" when "1110",
"0001110" when others;
END;
On a ajouté la ligne :
EN,Unknown,PIN_C11,7,B7_N0,PIN_C11,3.3-V LVTTL,,,,,
aux contraintes.