Question

use vhdl to scroll a message on a 7 segment display

Answer 1

  library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity divfreq2 is
Port ( clk : in STD_LOGIC;
reset : in STD_LOGIC;
clko : out STD_LOGIC);
end divfreq2;

architecture Behavioral of divfreq2 is

begin

process(clk)
variable cnt:std_logic_vector(9 downto 0);
begin
if(clk'event and clk='1') then
if(reset='1') then
cnt:=(others=>'0');
clko<='0';
else
if(cnt=999) then
cnt:=(others=>'0');
clko<='1';
else
cnt:=cnt+1;
clko<='0';
end if;
end if;
end if;
end process;

end Behavioral;