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seven_four.vhd
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--------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 09:05:36 02/13/2009
-- Design Name:
-- Module Name: seven_four - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity seven_four is
Port ( in1 : in STD_LOGIC_VECTOR (3 downto 0);
in2 : in STD_LOGIC_VECTOR (3 downto 0);
in3 : in STD_LOGIC_VECTOR (3 downto 0);
in4 : in STD_LOGIC_VECTOR (3 downto 0);
clk : in STD_LOGIC;
dp : out STD_LOGIC;
sel : out STD_LOGIC_VECTOR (3 downto 0);
segment : out STD_LOGIC_VECTOR (6 downto 0)
);
end seven_four;
architecture Behavioral of seven_four is
signal counter : STD_LOGIC_VECTOR (17 downto 0);
signal sev_in1, sev_in2, sev_in3, sev_in4 : STD_LOGIC_VECTOR (6 downto 0);
begin
dp <= '1';
with in1 select
sev_in1 (6 downto 0)<=
"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 "1111",
"1111111" when others;
with in2 select
sev_in2 (6 downto 0)<=
"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 "1111",
"1111111" when others;
with in3 select
sev_in3 (6 downto 0)<=
"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 "1111",
"1111111" when others;
with in4 select
sev_in4 (6 downto 0)<=
"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 "1111",
"1111111" when others;
process (clk, sev_in1, sev_in2, sev_in3, sev_in4)
variable sec : STD_LOGIC_VECTOR (1 downto 0) := "00" ;
begin
if(clk'event and clk = '1') then
counter <= counter + 1;
sec := (counter(17) & counter(16));
end if;
case (sec) is
when "00" =>
sel <= "1110";
segment <= sev_in1;
when "01" =>
sel <= "1101";
segment <= sev_in2;
when "10" =>
sel <= "1011";
segment <= sev_in3;
when "11" =>
sel <= "0111";
segment <= sev_in4;
when others =>
sel <= "1111";
segment <= "1111111";
end case;
end process;
end Behavioral;