adrctrlreg.vhd

ARM7核在FPGA中的VHDL代码实现

--****************************************************************************************************
-- Address and address class signals registers for ARM core simualtion
-- Designed by Ruslan Lepetenok
-- Modified 07.12.2002
--****************************************************************************************************
library	IEEE;
use IEEE.std_logic_1164.all;

entity AdrCtrlReg is port (
						   -- Global control signals
	                       nRESET    : in  std_logic;
						   CLK       : in  std_logic;
						   CLKEN     : in  std_logic;
						   -- Address class signals 
						   ADDR_In   : in  std_logic_vector(31 downto 0);
						   WRITE_In  : in  std_logic;
						   SIZE_In   : in  std_logic_vector(1 downto 0);
						   -- Outputs
						   ADDR_Out  : out std_logic_vector(31 downto 0);
						   WRITE_Out : out std_logic;
						   SIZE_Out  : out std_logic_vector(1 downto 0)
						  );
end AdrCtrlReg;

architecture RTL of AdrCtrlReg is
begin

AdrClassSigReg:process(nRESET,CLK)
begin
if nRESET='0' then                          -- Reset
  ADDR_Out  <= (others =>'0');
  WRITE_Out <= '0';
  SIZE_Out  <= (others =>'0');
  elsif CLK='1' and CLK'event then           -- Clock
   if CLKEN='1' then                          -- Clock enable
  ADDR_Out  <= ADDR_In;
  WRITE_Out <= WRITE_In;
  SIZE_Out  <= SIZE_In;	 
   end if;	
end if;
end process;			
	
end RTL;