datamux.vhd

ARM7核在FPGA中的VHDL代码实现

--****************************************************************************************************
-- Data multiplexer for ARM memory sybsistem
-- Designed by Ruslan Lepetenok
-- Modified 07.12.2002
--****************************************************************************************************
library	IEEE;
use IEEE.std_logic_1164.all;

entity DataMux is port (
					    -- Control inputs
						SelDevA	 : in  std_logic;
						SelDevB	 : in  std_logic;
						SelDevC	 : in  std_logic;
						SelDevD	 : in  std_logic;						  
					    -- Input data  
						DataAIn  : in  std_logic_vector(31 downto 0);
						DataBIn  : in  std_logic_vector(31 downto 0);
						DataCIn  : in  std_logic_vector(31 downto 0);
						DataDIn  : in  std_logic_vector(31 downto 0);
						-- Data output  
						DataOut  : out std_logic_vector(31 downto 0)
       				   );
end DataMux;

architecture RTL of DataMux is
begin
	
DataOutMultiplexer:for i in DataOut'range	generate
  DataOut(i) <= (DataAIn(i) and SelDevA)or
                (DataBIn(i) and SelDevB)or
                (DataCIn(i) and SelDevC)or
                (DataDIn(i) and SelDevD);
end generate;	
	
end RTL;