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-- Entity:  pcifbackend

-- File:    pcifbackend.vhd

-- Author:  Nils-Johan Wessman - Gaisler Research

-- Description: CAN Multiplexer (to connect two CAN buses to one CAN core) 

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library ieee;

use ieee.std_logic_1164.all;

entity canmux is

   port(

      sel      : in std_logic;

      canrx    : out std_logic;

      cantx    : in std_logic;

      canrxv   : in std_logic_vector(0 to 1);

      cantxv   : out std_logic_vector(0 to 1)

       );

end;

architecture rtl of canmux is

begin

comb : process(sel, cantx, canrxv)

begin

   if sel = '1' then

      canrx <= canrxv(1);

      cantxv(0) <= '1';

      cantxv(1) <= cantx;

   else

      canrx <= canrxv(0);

      cantxv(0) <= cantx;

      cantxv(1) <= '1';

   end if;

end process;

end;