bm.vhd

用NEC编码方式写的红外发送程序,包括三个部分,分频,编码,编码输出

library ieee;                   --38KHz
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity bm is
port(clk,d,en:in std_logic;
     bianma,en_ad,clk_out:out std_logic;
     data:out std_logic_vector(15 downto 0));
end;
architecture one of bm is
   signal cnt1:std_logic_vector(6 downto 0);
   signal cnt2:std_logic_vector(6 downto 0);
   signal cnt3:std_logic_vector(8 downto 0);
   signal cnt4:std_logic_vector(8 downto 0);
   constant f1:integer:=21
   begin
    process(en)
       if en'event and en='1' then  
             if cnt3=