7 Segment Displays Digilent Spartan 3 Board Discussion

7 -Segment Displays Digilent Spartan 3 Board Discussion D 3. 3

Spartan 3 Board

Turning on an LED Note: A zero turns on the LED

Spartan 3 Board

7 -Segment Decoder a-g LOW to turn on segment

7 -Segment Display Truth table q a b c d e f g 0 1 1 1 0 0 2 1 1 0 1 3 1 1 0 0 1 4 0 1 1 0 0 1 1 5 1 0 1 1 6 1 0 1 1 1 7 1 1 1 0 0 q(3: 0) seg 7 dec q a b c d e f g 8 1 1 1 1 9 1 1 0 1 1 A 1 1 1 0 1 1 1 b 0 0 1 1 1 C 1 0 0 1 1 1 0 d 0 1 1 0 1 E 1 0 0 1 1 F 1 0 0 0 1 1 1 Ato. G(6: 0)

7 -Segment Decoder library IEEE; use IEEE. std_logic_1164. all; entity seg 7 dec is port (q: in STD_LOGIC_VECTOR(3 downto 0); Ato. G: out STD_LOGIC_VECTOR(6 downto 0)); end seg 7 dec; q(3: 0) seg 7 dec Ato. G(6: 0)

architecture seg 7 dec_arch of seg 7 dec is begin process(q) begin case q is when "0000" => Ato. G <= "0000001"; when "0001" => Ato. G <= "1001111"; when "0010" => Ato. G <= "0010010"; when "0011" => Ato. G <= "0000110"; when "0100" => Ato. G <= "1001100"; when "0101" => Ato. G <= "0100100"; when "0110" => Ato. G <= "0100000"; when "0111" => Ato. G <= "0001101"; when "1000" => Ato. G <= "0000000"; when "1001" => Ato. G <= "0000100"; when "1010" => Ato. G <= "0001000"; when "1011" => Ato. G <= "1100000"; when "1100" => Ato. G <= "0110001"; when "1101" => Ato. G <= "1000010"; when "1110" => Ato. G <= "0110000"; when others => Ato. G <= "0111000"; end case; end process; end seg 7 dec_arch;

7 -Segment Display VHDL Behavior (Active LOW) q(3: 0) seg 7 dec -- seg 7 dec with q select Ato. G <= "1001111" when "0001", --1 "0010010" when "0010", --2 "0000110" when "0011", --3 Ato. G "1001100" when "0100", --4 "0100100" when "0101", --5 "0100000" when "0110", --6 "0001111" when "0111", --7 "0000000" when "1000", --8 "0000100" when "1001", --9 "0001000" when "1010", --A "1100000" when "1011", --b "0110001" when "1100", --C "1000010" when "1101", --d "0110000" when "1110", --E Ato. G(6: 0) "0111000" when "1111", --F "0000001" when others; --0

. ucf file NET NET NET "AN<0>" "AN<1>" "AN<2>" "AN<3>" "Ato. G<6>" "Ato. G<5>" "Ato. G<4>" "Ato. G<3>" "Ato. G<2>" "Ato. G<1>" "Ato. G<0>" "dp" LOC LOC LOC = = = "E 13" "F 14" "G 14" "d 14" "E 14" "G 13" "N 15" "P 15" "R 16" "F 13" "N 16" "P 16" ; ; ;