m_signal.vhd

用DE2板子实现的正选信号发生器,需安装quartus2软件,硬件需要DE2的开发板

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;

entity m_signal is
port(clk10k:in std_logic;
     q:out std_logic);
end m_signal;

architecture behav of m_signal is
signal data:integer range 0 to 6;
begin

process(clk10k)
begin
    if(clk10k'event and clk10k='1')then
        if(data=6)then
           data<=0;
        else 
           data<=data+1;
        end if;
   end if;
end process;

process(data)
begin
    if(clk10k'event and clk10k='1')then
        if(data=0)then
          	q<='0';
        elsif(data=1)then
		 	 q<='1';
         elsif(data=2)then
		 		q<='0';
          elsif(data=3)then
		 		 q<='0';
           elsif(data=4)then
		  		q<='1';
            elsif(data=5)then
		    	q<='1';
             else
		     q<='1';
         end if;
   end if;
end process;

end behav;