cmplcode2.vhd

来自「数字均衡器是通讯信道抗码间干扰的重要环节,这是一个用vhdl写的代码以及用SYN」· VHDL 代码 · 共 33 行

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

entity cmplcode2 is
    generic (n:positive:=9);
    port (clk:in std_logic;
          resetn:in std_logic;
          cmpl_en:in std_logic;
          xin:in std_logic_vector(n-1 downto 0);
          cmp_xin:out std_logic_vector(n-1 downto 0)
);
end cmplcode2;

architecture rtl of cmplcode2 is
     signal cmpl_en_m:std_logic;
     begin
       process(clk,resetn)
          variable xin_tem:std_logic_vector(n-1 downto 0);
         begin
        if resetn='0' then
           cmpl_en_m<='0';
        elsif clk'event and clk='1' then
           cmpl_en_m<=cmpl_en;
           if cmpl_en_m='1' then
               xin_tem:=not xin;
               xin_tem:=xin_tem+1;
           end if;
       end if;
           cmp_xin<=xin_tem;
end process;
end rtl;