Subversion Repositories pif2wb

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

use ieee.std_logic_arith.all;

entity AdrDec is

  generic (

    constant ADRS_SIZE    :     integer := 32;

    constant ADRS_BITS    :     integer := 4;

    constant ADRS_RANGE   :     integer := 8 );

  port (

    AdrIn                 : in  std_logic_vector(ADRS_SIZE-1 downto ADRS_SIZE-ADRS_BITS);

    AdrValid              : out std_logic);

end AdrDec;

architecture Behavioral of AdrDec is

signal Address : std_logic_vector (ADRS_BITS - 1 downto 0);

begin

        Address <= conv_std_logic_vector(ADRS_RANGE, ADRS_BITS);

        process (AdrIn)

        begin

                if (AdrIn (ADRS_SIZE - 1 downto ADRS_SIZE - ADRS_BITS) >= Address) then

                        AdrValid <= '1';

                else

                        AdrValid <= '0';

                end if;

        end process;

end Behavioral;