decode3.vhd

使用VHDL语言进行的数字锁相环的设计

  -------------------------------------------------------------
  --Copyright (C), 2004- , Huangwei.                         --
  --File name:decode3                          --
  --Author:huangwei       Version:1.0        Date:2004/11/24 --
  --Description:                                             --
  --该程序主要完成的功能是将归零的HDB3码转换成NRZ型的HDB3码  --
  -------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity decode3 is

port(
     clk:in std_logic;               --输入时钟
     datain: in std_logic;           --归零的HDB3码数据输入
     
     dataout: out std_logic          --NRZ型的HDB3码数据输出
     );
     
end decode3;

architecture decode3_arc of decode3 is

begin

process(clk)

begin

if (clk'event and clk = '0') then

    dataout <= datain;
    
end if;

end process;

end decode3_arc;