tiaopin.vhd

来自「用VHDL语言实现QPSK调制功能和解调功能,」· VHDL 代码 · 共 25 行

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity tiaopin is
	port (clk: in std_logic;
		  tpin: out std_logic
		   );
end tiaopin;
architecture rtl of tiaopin is
 begin
	process(clk)
	variable m : std_logic_vector(6 downto 0):="0000000";
	begin
		if (clk'event and clk='1') then
		      if (m="1000011") then 
			      tpin<= '1';
			      m:="0000000";
			  else 
			      m:=m+1;
			      tpin<='0';
			end if;
		end if;
   end process;
end rtl;