single_send.vhd

来自「上海外滩看到的最大的LED显示屏的内核源代码」· VHDL 代码 · 共 48 行

LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
USE ieee.std_logic_unsigned.all;

ENTITY single_send IS
PORT (	
        in_data   	:IN		STD_LOGIC;
        in_clk 	    :IN		STD_LOGIC;
        out_data   	:OUT	std_logic;
        out_clk  	:OUT	std_logic
		);

END single_send;

ARCHITECTURE A OF single_send IS 
 -- SIGNAL		send_counter : std_logic_vector(1 downto 0);
  SIGNAL		send_counter : std_logic;
  --SIGNAL		ldd_clk    	 : STD_LOGIC;
 -- SIGNAL		rclk    	 : STD_LOGIC;
  SIGNAL		data_temp   	 : STD_LOGIC;

 BEGIN 
 out_clk<=in_clk;  
 send_data:  process (in_clk)
       begin
       if in_clk'event and in_clk='1' then
         if send_counter='0' then
             data_temp<=in_data;
             out_data<=data_temp;
             send_counter<='1';
         elsif send_counter='1' then
             out_data<=not data_temp;
          --  if in_data/=data_temp then
          --      send_counter<='1';
          --      out_data<= data_temp;
         --   else
               send_counter<='0';
          --     out_data<=not data_temp;
          --  end if;
         else
             send_counter<='0';
         end if ; 
       end if;
   end process send_data;
END ;