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-- $Id: bp_rs232_4line_iob.vhd 641 2015-02-01 22:12:15Z mueller $

--

-- Copyright 2010-2011 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:    bp_rs232_4line_iob - syn

-- Description:    iob's for 4 line rs232 (RXD,TXD and RTS,CTS)

--

-- Dependencies:   xlib/iob_reg_i

--                 xlib/iob_reg_o

--

-- Test bench:     -

--

-- Target Devices: generic

-- Tool versions:  ise 11.4-14.7; viv 2014.4; ghdl 0.26-0.31

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2011-07-01   386   1.1    moved and renamed to bpgen

-- 2010-04-17   278   1.0    Initial version (as s3_rs232_iob_ext)

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

--    

library ieee;

use ieee.std_logic_1164.all;

use work.slvtypes.all;

use work.xlib.all;

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

entity bp_rs232_4line_iob is            -- iob's for 4 line rs232 (w/ RTS,CTS)

  port (

    CLK : in slbit;                     -- clock

    RXD : out slbit;                    -- receive data (board view)

    TXD : in slbit;                     -- transmit data (board view)

    CTS_N : out slbit;                  -- clear to send   (act. low)

    RTS_N : in slbit;                   -- request to send (act. low)

    I_RXD : in slbit;                   -- pad-i: receive data (board view)

    O_TXD : out slbit;                  -- pad-o: transmit data (board view)

    I_CTS_N : in slbit;                 -- pad-i: clear to send   (act. low)

    O_RTS_N : out slbit                 -- pad-o: request to send (act. low)

  );

end bp_rs232_4line_iob;

architecture syn of bp_rs232_4line_iob is

begin

  IOB_RXD : iob_reg_i                  -- line idle=1, so init sync flop =1

    generic map (INIT => '1')

    port map (CLK => CLK, CE => '1', DI => RXD,   PAD => I_RXD);

  IOB_TXD : iob_reg_o                  -- line idle=1, so init sync flop =1

    generic map (INIT => '1')

    port map (CLK => CLK, CE => '1', DO => TXD,   PAD => O_TXD);

  IOB_CTS : iob_reg_i

    port map (CLK => CLK, CE => '1', DI => CTS_N, PAD => I_CTS_N);

  IOB_RTS : iob_reg_o

    port map (CLK => CLK, CE => '1', DO => RTS_N, PAD => O_RTS_N);

end syn;