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-- $Id: rlink_sp2c.vhd 755 2016-03-28 17:59:59Z mueller $

--

-- Copyright 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:    rlink_sp2c - syn

-- Description:    rlink_core8 + serport_2clock2 combo

--

-- Dependencies:   rlink_core8

--                 serport/serport_2clock2

--                 rbus/rbd_rbmon

--                 rbus/rb_sres_or_2

--

-- Test bench:     -

--

-- Target Devices: generic

-- Tool versions:  viv 2015.4; ghdl 0.33

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2016-03-28   755   1.0    Initial version (derived from rlink_sp1c)

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

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.slvtypes.all;

use work.rblib.all;

use work.rbdlib.all;

use work.rlinklib.all;

use work.serportlib.all;

entity rlink_sp2c is                    -- rlink_core8+serport_2clock2 combo

  generic (

    BTOWIDTH : positive :=  5;          -- rbus timeout counter width

    RTAWIDTH : positive :=  12;         -- retransmit buffer address width

    SYSID : slv32 := (others=>'0');     -- rlink system id

    IFAWIDTH : natural :=  5;           -- input fifo address width  (0=none)

    OFAWIDTH : natural :=  5;           -- output fifo address width (0=none)

    ENAPIN_RLMON : integer := -1;       -- SB_CNTL for rlmon  (-1=none)

    ENAPIN_RLBMON: integer := -1;       -- SB_CNTL for rlbmon (-1=none)

    ENAPIN_RBMON : integer := -1;       -- SB_CNTL for rbmon  (-1=none)

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

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

    RBMON_AWIDTH : natural := 0;        -- rbmon: buffer size, (0=none)

    RBMON_RBADDR : slv16 := slv(to_unsigned(16#ffe8#,16))); -- rbmon: base addr

  port (

    CLK  : in slbit;                    -- U|clock (user design)

    CE_USEC : in slbit;                 -- U|1 usec clock enable

    CE_MSEC : in slbit;                 -- U|1 msec clock enable

    CE_INT : in slbit := '0';           -- U|rri ato time unit clock enable

    RESET  : in slbit;                  -- U|reset

    CLKS : in slbit;                    -- S|clock (frontend:serial)

    CES_MSEC : in slbit;                -- S|1 msec clock enable

    ENAXON : in slbit;                  -- U|enable xon/xoff handling

    ESCFILL : in slbit;                 -- U|enable fill escaping

    RXSD : in slbit;                    -- S|receive serial data    (board view)

    TXSD : out slbit;                   -- S|transmit serial data   (board view)

    CTS_N : in slbit := '0';            -- S|clear to send (act.low, board view)

    RTS_N : out slbit;                  -- S|request to send (act.low, brd view)

    RB_MREQ : out rb_mreq_type;         -- U|rbus: request

    RB_SRES : in rb_sres_type;          -- U|rbus: response

    RB_LAM : in slv16;                  -- U|rbus: look at me

    RB_STAT : in slv4;                  -- U|rbus: status flags

    RL_MONI : out rl_moni_type;         -- U|rlink_core: monitor port

    SER_MONI : out serport_moni_type    -- U|serport: monitor port

  );

end entity rlink_sp2c;

architecture syn of rlink_sp2c is

  signal RLB_DI : slv8 := (others=>'0');

  signal RLB_ENA : slbit := '0';

  signal RLB_BUSY : slbit := '0';

  signal RLB_DO : slv8 := (others=>'0');

  signal RLB_VAL : slbit := '0';

  signal RLB_HOLD : slbit := '0';

  signal RB_MREQ_M     : rb_mreq_type := rb_mreq_init;

  signal RB_SRES_M     : rb_sres_type := rb_sres_init;

  signal RB_SRES_RBMON : rb_sres_type := rb_sres_init;

begin

  CORE : rlink_core8                    -- rlink master ----------------------

    generic map (

      BTOWIDTH     => BTOWIDTH,

      RTAWIDTH     => RTAWIDTH,

      SYSID        => SYSID,

      ENAPIN_RLMON => ENAPIN_RLMON,

      ENAPIN_RLBMON=> ENAPIN_RLBMON,

      ENAPIN_RBMON => ENAPIN_RBMON)

    port map (

      CLK        => CLK,

      CE_INT     => CE_INT,

      RESET      => RESET,

      ESCXON     => ENAXON,

      ESCFILL    => ESCFILL,

      RLB_DI     => RLB_DI,

      RLB_ENA    => RLB_ENA,

      RLB_BUSY   => RLB_BUSY,

      RLB_DO     => RLB_DO,

      RLB_VAL    => RLB_VAL,

      RLB_HOLD   => RLB_HOLD,

      RL_MONI    => RL_MONI,

      RB_MREQ    => RB_MREQ_M,

      RB_SRES    => RB_SRES_M,

      RB_LAM     => RB_LAM,

      RB_STAT    => RB_STAT

    );

  SERPORT : serport_2clock2             -- serport interface -----------------

    generic map (

      CDWIDTH   => CDWIDTH,

      CDINIT    => CDINIT,

      RXFAWIDTH => IFAWIDTH,

      TXFAWIDTH => OFAWIDTH)

    port map (

      CLKU     => CLK,

      RESET    => RESET,

      CLKS     => CLKS,

      CES_MSEC => CES_MSEC,

      ENAXON   => ENAXON,

      ENAESC   => '0',                  -- escaping now in rlink_core8

      RXDATA   => RLB_DI,

      RXVAL    => RLB_ENA,

      RXHOLD   => RLB_BUSY,

      TXDATA   => RLB_DO,

      TXENA    => RLB_VAL,

      TXBUSY   => RLB_HOLD,

      MONI     => SER_MONI,

      RXSD     => RXSD,

      TXSD     => TXSD,

      RXRTS_N  => RTS_N,

      TXCTS_N  => CTS_N

    );

  RBMON : if RBMON_AWIDTH > 0 generate  -- rbus monitor --------------

  begin

    I0 : rbd_rbmon

      generic map (

        RB_ADDR => RBMON_RBADDR,

        AWIDTH  => RBMON_AWIDTH)

      port map (

        CLK         => CLK,

        RESET       => RESET,

        RB_MREQ     => RB_MREQ_M,

        RB_SRES     => RB_SRES_RBMON,

        RB_SRES_SUM => RB_SRES_M

      );

  end generate RBMON;

  RB_SRES_OR : rb_sres_or_2             -- rbus or ---------------------------

    port map (

      RB_SRES_1  => RB_SRES,

      RB_SRES_2  => RB_SRES_RBMON,

      RB_SRES_OR => RB_SRES_M

    );

  RB_MREQ         <= RB_MREQ_M;         -- setup output signals

end syn;