www.pudn.com > DDSforsinandcos.rar > datechange.vhd

library ieee; 
 use ieee.std_logic_1164.all; 
 use ieee.std_logic_unsigned.all; 
entity datechange is 
 port( 
    date : in std_logic; 
    romdate :in std_logic_vector(7 downto 0); 
    lastdate : out std_logic_vector(7 downto 0) 
); 
end datechange; 
architecture behave of datechange is 
  begin  
     process(date,romdate) 
    begin 
        if(date='1')then 
          lastdate<=not romdate; 
        else  
           lastdate<= romdate; 
  end if; 
    end process; 
 end behave;