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

entity BBusMultiplexer is port(
					   -- Data input
	                   RegFileBOut        : in  std_logic_vector(31 downto 0);
	                   MultiplierBOut     : in  std_logic_vector(31 downto 0);
					   MemDataRegOut      : in  std_logic_vector(31 downto 0);
					   AdrGenDataOut	  : in  std_logic_vector(31 downto 0);
					   -- Immediate fields
					   SExtOffset24Bit    : in  std_logic_vector(31 downto 0);
                       Offset12Bit        : in  std_logic_vector(31 downto 0);
                       Offset8Bit         : in  std_logic_vector(31 downto 0);
                       Immediate8Bit      : in  std_logic_vector(31 downto 0);
					   -- Control
					   RegFileBOutSel     : in  std_logic;	-- Output of the register file
	                   MultiplierBOutSel  : in  std_logic;	-- Output of the multiplier
					   MemDataRegOutSel   : in  std_logic;	-- Output of the data in register
					   SExtOffset24BitSel : in  std_logic;
                       Offset12BitSel     : in  std_logic;
                       Offset8BitSel      : in  std_logic;
                       Immediate8BitSel   : in  std_logic;
					   AdrGenDataSel	  : in  std_logic;
					   -- Data output
					   BBusOut		      : out std_logic_vector(31 downto 0)	 -- Connected to the input of the shifter
					          );
end BBusMultiplexer;

architecture RTL of BBusMultiplexer is
begin

BBusMux:for i in BBusOut'range generate
BBusOut(i) <= (RegFileBOut(i) and RegFileBOutSel)or
              (MultiplierBOut(i) and MultiplierBOutSel)or
			  (MemDataRegOut(i) and MemDataRegOutSel)or 
			  (SExtOffset24Bit(i) and SExtOffset24BitSel)or 
			  (Offset12Bit(i) and Offset12BitSel)or 
			  (Offset8Bit(i) and Offset8BitSel)or 
			  (Immediate8Bit(i) and Immediate8BitSel)or
			  (AdrGenDataOut(i) and AdrGenDataSel);
end generate;	
	
end RTL;