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-- $Id: rlink_rlbmux.vhd 466 2012-12-30 13:26:55Z mueller $

--

-- Copyright 2012- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>

--

-- This program is free software; you may redistribute and/or modify it under

-- the terms of the GNU General Public License as published by the Free

-- Software Foundation, either version 2, or at your option any later version.

--

-- This program is distributed in the hope that it will be useful, but

-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

-- for complete details.

--

------------------------------------------------------------------------------

-- Module Name:    rlink_rlbmux - syn

-- Description:    rlink rlb multiplexer

--

-- Dependencies:   -

-- Test bench:     -

-- Tool versions:  xst 13.3; ghdl 0.29

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2012-12-29   466   1.0    Initial version 

------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use ieee.std_logic_textio.all;

use std.textio.all;

use work.slvtypes.all;

entity rlink_rlbmux is               -- rlink rlb multiplexer

  port (

    SEL : in slbit;                     -- port select (0:RLB<->P0; 1:RLB<->P1)

    RLB_DI : out slv8;                  -- rlb: data in

    RLB_ENA : out slbit;                -- rlb: data enable

    RLB_BUSY : in slbit;                -- rlb: data busy

    RLB_DO : in slv8;                   -- rlb: data out

    RLB_VAL : in slbit;                 -- rlb: data valid

    RLB_HOLD : out slbit;               -- rlb: data hold

    P0_RXDATA : in slv8;                -- p0: rx data

    P0_RXVAL : in slbit;                -- p0: rx valid

    P0_RXHOLD : out slbit;              -- p0: rx hold

    P0_TXDATA : out slv8;               -- p0: tx data

    P0_TXENA : out slbit;               -- p0: tx enable

    P0_TXBUSY : in slbit;               -- p0: tx busy

    P1_RXDATA : in slv8;                -- p1: rx data

    P1_RXVAL : in slbit;                -- p1: rx valid

    P1_RXHOLD : out slbit;              -- p1: rx hold

    P1_TXDATA : out slv8;               -- p1: tx data

    P1_TXENA : out slbit;               -- p1: tx enable

    P1_TXBUSY : in slbit                -- p1: tx busy

  );

end rlink_rlbmux;

architecture syn of rlink_rlbmux is

begin

  proc_rlmux : process (SEL, RLB_DO, RLB_VAL, RLB_BUSY,

                        P0_RXDATA, P0_RXVAL, P0_TXBUSY,

                        P1_RXDATA, P1_RXVAL, P1_TXBUSY)

  begin

    P0_TXDATA <= RLB_DO;

    P1_TXDATA <= RLB_DO;

    if SEL = '0' then

      RLB_DI    <= P0_RXDATA;

      RLB_ENA   <= P0_RXVAL;

      P0_RXHOLD <= RLB_BUSY;

      P0_TXENA  <= RLB_VAL;

      RLB_HOLD  <= P0_TXBUSY;

      P1_RXHOLD <= '0';

      P1_TXENA  <= '0';

    else

      RLB_DI    <= P1_RXDATA;

      RLB_ENA   <= P1_RXVAL;

      P1_RXHOLD <= RLB_BUSY;

      P1_TXENA  <= RLB_VAL;

      RLB_HOLD  <= P1_TXBUSY;

      P0_RXHOLD <= '0';

      P0_TXENA  <= '0';

    end if;

  end process proc_rlmux;

end syn;