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-- $Id: rlink_sp1c_fx2.vhd 672 2015-05-02 21:58:28Z mueller $

--

-- Copyright 2013-2015 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_sp1c_fx2 - syn

-- Description:    rlink_core8 + serport_1clock + fx2 combo

--

-- Dependencies:   rlinklib/rlink_core8

--                 serport/serport_1clock

--                 rlinklib/rlink_rlbmux

--                 fx2lib/fx2_2fifoctl_ic

--                 rbus/rbd_rbmon

--                 rbus/rb_sres_or_2

--

-- Test bench:     -

--

-- Target Devices: generic

-- Tool versions:  xst 13.1-14.7; viv 2014.4; ghdl 0.29-0.31

--

-- Synthesized (xst):

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

-- 2015-05-02   672 14.7  131013 xc6slx16-2   618  875   90  340 s  7.2   -   -

-- 2013-04-20   509 13.3    O76d xc3s1200e-4  441  903  128  637 s  8.7   -   -

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2015-05-02   672   1.3    add rbd_rbmon (optional via generics)

-- 2015-04-11   666   1.2    drop ENAESC, rearrange XON handling

-- 2014-08-28   588   1.1    use new rlink v4 iface generics and 4 bit STAT

-- 2013-04-20   509   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;

use work.fx2lib.all;

entity rlink_sp1c_fx2 is                -- rlink_core8+serport_1clk+fx2_ic 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;           -- ser input fifo addr width  (0=none)

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

    PETOWIDTH : positive := 10;         -- fx2 packet end time-out counter width

    CCWIDTH :   positive :=  5;         -- fx2 chunk counter width

    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;                    -- clock

    CE_USEC : in slbit;                 -- 1 usec clock enable

    CE_MSEC : in slbit;                 -- 1 msec clock enable

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

    RESET  : in slbit;                  -- reset

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

    ENAFX2 : in slbit;                  -- enable fx2 usage

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

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

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

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

    RB_MREQ : out rb_mreq_type;         -- rbus: request

    RB_SRES : in rb_sres_type;          -- rbus: response

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

    RB_STAT : in slv4;                  -- rbus: status flags

    RL_MONI : out rl_moni_type;         -- rlink_core: monitor port

    RLB_MONI : out rlb_moni_type;       -- rlink 8b: monitor port

    SER_MONI : out serport_moni_type;   -- ser: monitor port

    FX2_MONI : out fx2ctl_moni_type;    -- fx2: monitor port

    I_FX2_IFCLK : in slbit;             -- fx2: interface clock

    O_FX2_FIFO : out slv2;              -- fx2: fifo address

    I_FX2_FLAG : in slv4;               -- fx2: fifo flags

    O_FX2_SLRD_N : out slbit;           -- fx2: read enable    (act.low)

    O_FX2_SLWR_N : out slbit;           -- fx2: write enable   (act.low)

    O_FX2_SLOE_N : out slbit;           -- fx2: output enable  (act.low)

    O_FX2_PKTEND_N : out slbit;         -- fx2: packet end     (act.low)

    IO_FX2_DATA : inout slv8            -- fx2: data lines

  );

end entity rlink_sp1c_fx2;

architecture syn of rlink_sp1c_fx2 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 SER_RXDATA : slv8 := (others=>'0');

  signal SER_RXVAL  : slbit := '0';

  signal SER_RXHOLD : slbit := '0';

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

  signal SER_TXENA  : slbit := '0';

  signal SER_TXBUSY : slbit := '0';

  signal FX2_RXDATA   : slv8 := (others=>'0');

  signal FX2_RXVAL    : slbit := '0';

  signal FX2_RXHOLD   : slbit := '0';

  signal FX2_RXAEMPTY : slbit := '0';

  signal FX2_TXDATA   : slv8 := (others=>'0');

  signal FX2_TXENA    : slbit := '0';

  signal FX2_TXBUSY   : slbit := '0';

  signal FX2_TXAFULL  : 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    => '0',                -- not used in FX2 enabled boards

      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_1clock              -- serport interface -----------------

    generic map (

      CDWIDTH   => CDWIDTH,

      CDINIT    => CDINIT,

      RXFAWIDTH => IFAWIDTH,

      TXFAWIDTH => OFAWIDTH)

    port map (

      CLK      => CLK,

      CE_MSEC  => CE_MSEC,

      RESET    => RESET,

      ENAXON   => ENAXON,

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

      RXDATA   => SER_RXDATA,

      RXVAL    => SER_RXVAL,

      RXHOLD   => SER_RXHOLD,

      TXDATA   => SER_TXDATA,

      TXENA    => SER_TXENA,

      TXBUSY   => SER_TXBUSY,

      MONI     => SER_MONI,

      RXSD     => RXSD,

      TXSD     => TXSD,

      RXRTS_N  => RTS_N,

      TXCTS_N  => CTS_N

    );

  RLBMUX : rlink_rlbmux                 -- rlink control mux -----------------

    port map (

      SEL       => ENAFX2,

      RLB_DI    => RLB_DI,

      RLB_ENA   => RLB_ENA,

      RLB_BUSY  => RLB_BUSY,

      RLB_DO    => RLB_DO,

      RLB_VAL   => RLB_VAL,

      RLB_HOLD  => RLB_HOLD,

      P0_RXDATA => SER_RXDATA,

      P0_RXVAL  => SER_RXVAL,

      P0_RXHOLD => SER_RXHOLD,

      P0_TXDATA => SER_TXDATA,

      P0_TXENA  => SER_TXENA,

      P0_TXBUSY => SER_TXBUSY,

      P1_RXDATA => FX2_RXDATA,

      P1_RXVAL  => FX2_RXVAL,

      P1_RXHOLD => FX2_RXHOLD,

      P1_TXDATA => FX2_TXDATA,

      P1_TXENA  => FX2_TXENA,

      P1_TXBUSY => FX2_TXBUSY

    );

  RLB_MONI.rxval  <= RLB_VAL;

  RLB_MONI.rxhold <= RLB_HOLD;

  RLB_MONI.txena  <= RLB_ENA;

  RLB_MONI.txbusy <= RLB_BUSY;

  FX2CNTL : fx2_2fifoctl_ic             -- FX2 interface ---------------------

    generic map (

      RXFAWIDTH  => 5,

      TXFAWIDTH  => 5,

      PETOWIDTH  => PETOWIDTH,

      CCWIDTH    => CCWIDTH,

      RXAEMPTY_THRES => 1,

      TXAFULL_THRES  => 1)

    port map (

      CLK      => CLK,

      RESET    => RESET,

      RXDATA   => FX2_RXDATA,

      RXVAL    => FX2_RXVAL,

      RXHOLD   => FX2_RXHOLD,

      RXAEMPTY => FX2_RXAEMPTY,

      TXDATA   => FX2_TXDATA,

      TXENA    => FX2_TXENA,

      TXBUSY   => FX2_TXBUSY,

      TXAFULL  => FX2_TXAFULL,

      MONI           => FX2_MONI,

      I_FX2_IFCLK    => I_FX2_IFCLK,

      O_FX2_FIFO     => O_FX2_FIFO,

      I_FX2_FLAG     => I_FX2_FLAG,

      O_FX2_SLRD_N   => O_FX2_SLRD_N,

      O_FX2_SLWR_N   => O_FX2_SLWR_N,

      O_FX2_SLOE_N   => O_FX2_SLOE_N,

      O_FX2_PKTEND_N => O_FX2_PKTEND_N,

      IO_FX2_DATA    => IO_FX2_DATA

    );

  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;