library IEEE; use IEEE.std_logic_1164.all; entity decoder_7seg is port( a : in std_logic; b : in std_logic; c : in std_logic; d : in std_logic; f_a : out std_logic; f_b : out std_logic; f_c : out std_logic; f_d : out std_logic; f_e : out std_logic; f_f : out std_logic; f_g : out std_logic ); end decoder_7seg; architecture behavioral of decoder_7seg is signal input : std_logic_vector (3 downto 0); signal internal_f_d : std_logic; signal internal_f_e : std_logic; signal internal_f_f : std_logic; signal internal_f_g : std_logic; begin input(3) <= d; input(2) <= c; input(1) <= b; input(0) <= a; -- 7-segment display layout -- Znazorneni 7segmentoveho displeje -- f_A -- --- -- f_F | | f_B -- --- <- f_G -- f_E | | f_C -- --- -- f_D -- A: B: C: D: E: F: -- --- --- --- --- -- | | | | | | | -- --- --- --- --- --- -- | | | | | | | | | -- --- --- --- --- ------------------------------------------------------------------- ------------------------------------------------------------------- -- Zde doplnte 3 algebraicke vyrazy pro segmenty f_a, f_b, f_c -- ------------------------------------------------------------------- ------------------------------------------------------------------- -- you can use the following operators: -- ---------------------------------- -- | operator | example | -- ---------------------------------- -- | and | a and b and c | -- | or | a or b or (c and d) | -- | not | not a | -- ---------------------------------- -- There is no priority of operators. Be sure to use brackets! -- example: -- given: f(a, b, c) = a * #b * #c + a * b -- in VHDL: f <= (a and (not b) and (not c)) or (a and b) -- ve vyrazech pouzivejte nasledujici operatory: -- ---------------------------------- -- | operator | priklad pouziti | -- ---------------------------------- -- | and | a and b and c | -- | or | a or b or (c and d) | -- | not | not a | -- ---------------------------------- -- pouzivejte zavorky! -- priklad: -- zadani: f(a, b, c) = a * #b * #c + a * b -- ve VHDL: f <= (a and (not b) and (not c)) or (a and b) -- Funkce jsou negovane, protoze jednotlive segmenty jsou aktivni v log. 0. -- Napriklad: -- f_a <= (not(((not a) and b) or (b and (not c)) or ((not c) and d) or ((not b) and c and (not d)))); f_a <= not('1'); f_b <= not('1'); f_c <= not('1'); -- V pripade, ze pri vyplnovani tabulek zapomneli na to, ze jednotlive segmenty jsou aktivni v log. 0, muzete na nasledujici radky pridat negaci. f_d <= internal_f_d; f_e <= internal_f_e; f_f <= internal_f_f; f_g <= internal_f_g; ----------------------------------------------------------------------- ----------------------------------------------------------------------- -- Zde doplnte vyrazy tabulkou pro zbyle segmenty f_d, f_e, f_f, f_g -- ----------------------------------------------------------------------- ----------------------------------------------------------------------- -- Zmena poradi vstupu a, b, c, d v zahlavi nema smysl - jedna se pouze o komentar. -- ------------------------------------------------------------------------ -- | funkcni hodnota f_d(d, c, b, a) | index | d | c | b | a | -- ------------------------------------------------------------------------ with input select internal_f_d <= '0' when "0000", -- | 0 | 0 | 0 | 0 | 0 | '0' when "0001", -- | 1 | 0 | 0 | 0 | 1 | '0' when "0010", -- | 2 | 0 | 0 | 1 | 0 | '0' when "0011", -- | 3 | 0 | 0 | 1 | 1 | '0' when "0100", -- | 4 | 0 | 1 | 0 | 0 | '0' when "0101", -- | 5 | 0 | 1 | 0 | 1 | '0' when "0110", -- | 6 | 0 | 1 | 1 | 0 | '0' when "0111", -- | 7 | 0 | 1 | 1 | 1 | '0' when "1000", -- | 8 | 1 | 0 | 0 | 0 | '0' when "1001", -- | 9 | 1 | 0 | 0 | 1 | '0' when "1010", -- | 10 | 1 | 0 | 1 | 0 | '0' when "1011", -- | 11 | 1 | 0 | 1 | 1 | '0' when "1100", -- | 12 | 1 | 1 | 0 | 0 | '0' when "1101", -- | 13 | 1 | 1 | 0 | 1 | '0' when "1110", -- | 14 | 1 | 1 | 1 | 0 | '0' when "1111", -- | 15 | 1 | 1 | 1 | 1 | '0' when others; -- ------------------------------------------------------------------------ -- | funkcni hodnota f_e(d, c, b, a) | index | d | c | b | a | -- ------------------------------------------------------------------------ with input select internal_f_e <= '0' when "0000", -- | 0 | 0 | 0 | 0 | 0 | '0' when "0001", -- | 1 | 0 | 0 | 0 | 1 | '0' when "0010", -- | 2 | 0 | 0 | 1 | 0 | '0' when "0011", -- | 3 | 0 | 0 | 1 | 1 | '0' when "0100", -- | 4 | 0 | 1 | 0 | 0 | '0' when "0101", -- | 5 | 0 | 1 | 0 | 1 | '0' when "0110", -- | 6 | 0 | 1 | 1 | 0 | '0' when "0111", -- | 7 | 0 | 1 | 1 | 1 | '0' when "1000", -- | 8 | 1 | 0 | 0 | 0 | '0' when "1001", -- | 9 | 1 | 0 | 0 | 1 | '0' when "1010", -- | 10 | 1 | 0 | 1 | 0 | '0' when "1011", -- | 11 | 1 | 0 | 1 | 1 | '0' when "1100", -- | 12 | 1 | 1 | 0 | 0 | '0' when "1101", -- | 13 | 1 | 1 | 0 | 1 | '0' when "1110", -- | 14 | 1 | 1 | 1 | 0 | '0' when "1111", -- | 15 | 1 | 1 | 1 | 1 | '0' when others; -- ------------------------------------------------------------------------ -- | funkcni hodnota f_f(d, c, b, a) | index | d | c | b | a | -- ------------------------------------------------------------------------ with input select internal_f_f <= '0' when "0000", -- | 0 | 0 | 0 | 0 | 0 | '0' when "0001", -- | 1 | 0 | 0 | 0 | 1 | '0' when "0010", -- | 2 | 0 | 0 | 1 | 0 | '0' when "0011", -- | 3 | 0 | 0 | 1 | 1 | '0' when "0100", -- | 4 | 0 | 1 | 0 | 0 | '0' when "0101", -- | 5 | 0 | 1 | 0 | 1 | '0' when "0110", -- | 6 | 0 | 1 | 1 | 0 | '0' when "0111", -- | 7 | 0 | 1 | 1 | 1 | '0' when "1000", -- | 8 | 1 | 0 | 0 | 0 | '0' when "1001", -- | 9 | 1 | 0 | 0 | 1 | '0' when "1010", -- | 10 | 1 | 0 | 1 | 0 | '0' when "1011", -- | 11 | 1 | 0 | 1 | 1 | '0' when "1100", -- | 12 | 1 | 1 | 0 | 0 | '0' when "1101", -- | 13 | 1 | 1 | 0 | 1 | '0' when "1110", -- | 14 | 1 | 1 | 1 | 0 | '0' when "1111", -- | 15 | 1 | 1 | 1 | 1 | '0' when others; -- ------------------------------------------------------------------------ -- | funkcni hodnota f_g(d, c, b, a) | index | d | c | b | a | -- ------------------------------------------------------------------------ with input select internal_f_g <= '0' when "0000", -- | 0 | 0 | 0 | 0 | 0 | '0' when "0001", -- | 1 | 0 | 0 | 0 | 1 | '0' when "0010", -- | 2 | 0 | 0 | 1 | 0 | '0' when "0011", -- | 3 | 0 | 0 | 1 | 1 | '0' when "0100", -- | 4 | 0 | 1 | 0 | 0 | '0' when "0101", -- | 5 | 0 | 1 | 0 | 1 | '0' when "0110", -- | 6 | 0 | 1 | 1 | 0 | '0' when "0111", -- | 7 | 0 | 1 | 1 | 1 | '0' when "1000", -- | 8 | 1 | 0 | 0 | 0 | '0' when "1001", -- | 9 | 1 | 0 | 0 | 1 | '0' when "1010", -- | 10 | 1 | 0 | 1 | 0 | '0' when "1011", -- | 11 | 1 | 0 | 1 | 1 | '0' when "1100", -- | 12 | 1 | 1 | 0 | 0 | '0' when "1101", -- | 13 | 1 | 1 | 0 | 1 | '0' when "1110", -- | 14 | 1 | 1 | 1 | 0 | '0' when "1111", -- | 15 | 1 | 1 | 1 | 1 | '0' when others; end;