vme_main_hub.vhd

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LIBRARY ieee ;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.all;


use work.CMXpackage.all;
--use work.CMX_VME_defs.all;

entity vme_main_hub is
  port(
    data_vme : inout std_logic_vector(15 downto 0);
    
    data_vme_from_below : in  std_logic_vector (15 downto 0);
        
    bus_drive_from_below : in std_logic;
    data_vme_going_below : out std_logic_vector(15 downto 0)
    
    );

-- Declarations

end vme_main_hub ;

ARCHITECTURE rtl OF vme_main_hub IS

  

BEGIN

  process(bus_drive_from_below,data_vme_from_below,data_vme)
  begin
    if bus_drive_from_below='1' then
      data_vme<=data_vme_from_below;
    else
      data_vme<="ZZZZZZZZZZZZZZZZ";
    end if;
    data_vme_going_below<=data_vme;
  end process;

END rtl;