abusmultiplexer.vhd

文件ARM_core_VHDL.rar 嵌入式arm核的vhdl语言描述.

--****************************************************************************************************
-- A bus multiplexer for ARM7TDMI-S processor
-- Designed by Ruslan Lepetenok
-- Modified 04.12.2002
--****************************************************************************************************
library	IEEE;
use IEEE.std_logic_1164.all;

entity ABusMultiplexer is port(
					   -- Data input
	                   RegFileAOut       : in  std_logic_vector(31 downto 0);
	                   MultiplierAOut    : in  std_logic_vector(31 downto 0);
					   CPSROut           : in  std_logic_vector(31 downto 0); 
					   SPSROut           : in  std_logic_vector(31 downto 0); 
					   -- Control
					   RegFileAOutSel    : in  std_logic;
	                   MultiplierAOutSel : in  std_logic;
					   CPSROutSel        : in  std_logic; 
					   SPSROutSel        : in  std_logic; 
					   -- Data output
					   ABusOut		     : out std_logic_vector(31 downto 0)
					          );
end ABusMultiplexer;

architecture RTL of ABusMultiplexer is
begin

ABusMux:for i in ABusOut'range generate
ABusOut(i) <= (RegFileAOut(i) and RegFileAOutSel)or
              (MultiplierAOut(i) and MultiplierAOutSel)or
			  (CPSROut(i) and CPSROutSel)or
			  (SPSROut(i) and SPSROutSel);
end generate;	
	
	
end RTL;