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-- $Id: serport_uart_rxtx_ab.vhd 774 2016-06-12 17:08:47Z mueller $

--

-- Copyright 2007-2016 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:    serport_uart_rxtx_ab - syn

-- Description:    serial port UART - transmitter-receiver + autobauder

--

-- Dependencies:   serport_uart_autobaud

--                 serport_uart_rxtx

-- Test bench:     -

-- Target Devices: generic

-- Tool versions:  ise 8.2-14.7; viv 2014.4-2016.2; ghdl 0.18-0.33

--

-- Synthesized (xst):

-- Date         Rev  ise         Target      flop lutl lutm slic t peri

-- 2015-04-12   666 14.7  131013 xc6slx16-2   100  142    0   48 s  6.2

-- 2010-12-25   348 12.1    M53d xc3s1000-4    99  197    -  124 s  9.8

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2015-02-01   641   1.2    add CLKDIV_F for autobaud;

-- 2011-10-22   417   1.1.1  now numeric_std clean

-- 2010-12-26   348   1.1    add ABCLKDIV port for clock divider setting

-- 2007-06-24    60   1.0    Initial version 

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

-- NOTE: for test bench usage a copy of all serport_* entities, with _tb

-- !!!!  appended to the name, has been created in the /tb sub folder.

-- !!!!  Ensure to update the copy when this file is changed !!

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.slvtypes.all;

use work.serportlib.all;

entity serport_uart_rxtx_ab is          -- serial port uart: rx+tx+autobaud

  generic (

    CDWIDTH : positive := 13;           -- clk divider width

    CDINIT: natural := 15);             -- clk divider initial/reset setting

  port (

    CLK : in slbit;                     -- clock

    CE_MSEC : in slbit;                 -- 1 msec clock enable

    RESET : in slbit;                   -- reset

    RXSD : in slbit;                    -- receive serial data (uart view)

    RXDATA : out slv8;                  -- receiver data out

    RXVAL : out slbit;                  -- receiver data valid

    RXERR : out slbit;                  -- receiver data error (frame error)

    RXACT : out slbit;                  -- receiver active

    TXSD : out slbit;                   -- transmit serial data (uart view)

    TXDATA : in slv8;                   -- transmit data in

    TXENA : in slbit;                   -- transmit data enable

    TXBUSY : out slbit;                 -- transmit busy

    ABACT : out slbit;                  -- autobaud active; if 1 clkdiv invalid

    ABDONE : out slbit;                 -- autobaud resync done

    ABCLKDIV : out slv(CDWIDTH-1 downto 0); -- autobaud clock divider setting

    ABCLKDIV_F : out slv3                   -- autobaud clock divider fraction

  );

end serport_uart_rxtx_ab;

architecture syn of serport_uart_rxtx_ab is

  signal CLKDIV : slv(CDWIDTH-1 downto 0) := slv(to_unsigned(0, CDWIDTH));

  signal CLKDIV_F : slv3 := (others=>'0');

  signal ABACT_L : slbit := '0';        -- local readable copy of ABACT

  signal UART_RESET : slbit := '0';

begin

  AB : serport_uart_autobaud

    generic map (

      CDWIDTH => CDWIDTH,

      CDINIT  => CDINIT)

    port map (

      CLK      => CLK,

      CE_MSEC  => CE_MSEC,

      RESET    => RESET,

      RXSD     => RXSD,

      CLKDIV   => CLKDIV,

      CLKDIV_F => CLKDIV_F,

      ACT      => ABACT_L,

      DONE     => ABDONE

    );

  UART_RESET <= ABACT_L or RESET;

  ABACT      <= ABACT_L;

  ABCLKDIV   <= CLKDIV;

  ABCLKDIV_F <= CLKDIV_F;

  RXTX : serport_uart_rxtx

    generic map (

      CDWIDTH => CDWIDTH)

    port map (

      CLK    => CLK,

      RESET  => UART_RESET,

      CLKDIV => CLKDIV,

      RXSD   => RXSD,

      RXDATA => RXDATA,

      RXVAL  => RXVAL,

      RXERR  => RXERR,

      RXACT  => RXACT,

      TXSD   => TXSD,

      TXDATA => TXDATA,

      TXENA  => TXENA,

      TXBUSY => TXBUSY

    );

end syn;