library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity delta_address is
port(
     clk:in std_logic;
     addin:in std_logic_vector(9 downto 0);
     addout:out std_logic_vector(7 downto 0));
end;

architecture delta of delta_address is
begin
   process(clk)
    begin
     if rising_edge(clk) then
      if addin(8)='1' then
          addout(7 downto 0)<=not addin(7 downto 0);
       else 
           addout(7 downto 0)<=addin(7 downto 0);
       end if;
     end if ;
    end process;
end;