mashuchu.vhd

dds信号发生器

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity mashuchu is
port(clk5:in std_logic;
      ma:out std_logic_vector(3 downto 0));
end;
architecture one of mashuchu is
signal ma1:std_logic_vector(3 downto 0);
begin
process(clk5)
begin
if clk5'event and clk5='1' then
   if ma1="1010" then ma1<="0000";
   else ma1<=ma1+1;
   end if;
end if;
end process;
ma<=ma1;
end;