git.zerfleddert.de Git - raggedstone/blob - dhwk/source/pci/io_mux.vhd

   1 -- J.STELZNER
   2 -- INFORMATIK-3 LABOR
   3 -- 23.08.2006
   4 -- File: IO_MUX.VHD
   5
   6 library IEEE;
   7 use IEEE.std_logic_1164.all;
   8
   9 entity IO_MUX is
  10         port
  11         (
  12                 READ_SEL :in std_logic_vector ( 1 downto 0);
  13                 USER_DATA :in std_logic_vector (31 downto 0);
  14                 CONFIG_DATA :in std_logic_vector (31 downto 0);
  15                 PCI_AD :in std_logic_vector (31 downto 0);
  16                 IO_DATA :out std_logic_vector (31 downto 0)
  17         );
  18 end entity IO_MUX;
  19
  20 architecture IO_MUX_DESIGN of IO_MUX is
  21
  22         signal MUX :std_logic_vector (31 downto 0);
  23
  24 begin
  25
  26         MUX <= PCI_AD when READ_SEL = "00" else -- WRITE_CONFIG
  27                PCI_AD when READ_SEL = "01" else -- WRITE_IO
  28                CONFIG_DATA when READ_SEL = "10" else -- READ_CONFIG
  29                USER_DATA when READ_SEL = "11" else -- READ_IO
  30                CONFIG_DATA;
  31
  32  -- MUX;
  33
  34         IO_DATA <= MUX;
  35
  36 end architecture IO_MUX_DESIGN;