下面这个代码中generic什么意思

只看该作者 · 2009-6-23 16:04

请问下面这个代码中generic是什么用
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;
use work.LPM_COMPONENTS.all;

entity LPM_CONSTANT is
    generic (LPM_WIDTH : natural;    -- MUST be greater than 0
             LPM_CVALUE : natural;
             LPM_STRENGTH : string := "UNUSED";
             LPM_TYPE : string := "LPM_CONSTANT";
             LPM_HINT : string := "UNUSED");
    port (RESULT : out std_logic_vector(LPM_WIDTH-1 downto 0));
end LPM_CONSTANT;

architecture LPM_SYN of LPM_CONSTANT is
begin

    RESULT <= conv_std_logic_vector(LPM_CVALUE, LPM_WIDTH);

end LPM_SYN;