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-- $Id: sn_humanio_demu_rbus.vhd 637 2015-01-25 18:36:40Z mueller $

--

-- Copyright 2013-2014 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:    sn_humanio_demu_rbus - syn

-- Description:    sn_humanio_demu with rbus interceptor

--

-- Dependencies:   bpgen/sn_humanio_demu

--

-- Test bench:     -

--

-- Target Devices: generic

-- Tool versions:  xst 13.3-14.7; ghdl 0.0.29-0.31

--

-- Synthesized (xst):

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

-- 2013-01-06   472 13.3   O76xd xc3s1000-4   160  136    0  124 s  6.1 ns 

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2014-08-15   583   1.1    rb_mreq addr now 16 bit

-- 2013-01-06   472   1.0    Initial version (cloned from sn_humanio_rbus

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

--

-- rbus registers:

--

-- Address   Bits Name        r/w/f  Function

-- bbbbbb00       cntl        r/w/-  Control register and BTN access

--           x:08   btn       r/w/-    r: return hio BTN status

--                                     w: ored with hio BTN to drive BTN

--              3   dsp_en    r/w/-    if 1 display data will be driven by rbus

--              2   dp_en     r/w/-    if 1 display dp's will be driven by rbus

--              1   led_en    r/w/-    if 1 LED will be driven by rri

--              0   swi_en    r/w/-    if 1 SWI will be driven by rri

--

-- bbbbbb01  7:00   swi       r/w/-    r: return hio SWI status

--                                     w: will drive SWI when swi_en=1

--

-- bbbbbb10         led       r/w/-  Interface to LED and DSP_DP

--          15:12     dp      r/w/-    r: returns DSP_DP status

--                                     w: will drive display dp's when dp_en=1

--           7:00     led     r/w/-    r: returns LED status

--                                     w: will drive led's when led_en=1

--

-- bbbbbb11 15:00   dsp       r/w/-    r: return hio DSP_DAT status

--                                     w: will drive DSP_DAT when dsp_en=1

--

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.slvtypes.all;

use work.rblib.all;

use work.bpgenlib.all;

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

entity sn_humanio_demu_rbus is          -- human i/o swi,btn,led only /w rbus

  generic (

    DEBOUNCE : boolean := true;         -- instantiate debouncer for SWI,BTN

    RB_ADDR : slv16 := slv(to_unsigned(16#fef0#,16)));

  port (

    CLK : in slbit;                     -- clock

    RESET : in slbit := '0';            -- reset

    CE_MSEC : in slbit;                 -- 1 ms clock enable

    RB_MREQ : in rb_mreq_type;          -- rbus: request

    RB_SRES : out rb_sres_type;         -- rbus: response

    SWI : out slv8;                     -- switch settings, debounced

    BTN : out slv4;                     -- button settings, debounced

    LED : in slv8;                      -- led data

    DSP_DAT : in slv16;                 -- display data

    DSP_DP : in slv4;                   -- display decimal points

    I_SWI : in slv8;                    -- pad-i: switches

    I_BTN : in slv6;                    -- pad-i: buttons

    O_LED : out slv8                    -- pad-o: leds

  );

end sn_humanio_demu_rbus;

architecture syn of sn_humanio_demu_rbus is

  type regs_type is record

    rbsel : slbit;                      -- rbus select

    swi : slv8;                         -- rbus swi

    btn : slv4;                         -- rbus btn

    led : slv8;                         -- rbus led

    dsp_dat : slv16;                    -- rbus dsp_dat

    dsp_dp  : slv4;                     -- rbus dsp_dp

    ledin : slv8;                       -- led from design

    swieff : slv8;                      -- effective swi

    btneff : slv4;                      -- effective btn

    ledeff : slv8;                      -- effective led

    dpeff : slv4;                       -- effective dsp_dp

    dateff : slv16;                     -- effective dsp_dat

    swi_en : slbit;                     -- enable: swi from rbus

    led_en : slbit;                     -- enable: led from rbus

    dsp_en : slbit;                     -- enable: dsp_dat from rbus

    dp_en : slbit;                      -- enable: dsp_dp  from rbus

  end record regs_type;

  constant regs_init : regs_type := (

    '0',                                -- rbsel

    (others=>'0'),                      -- swi

    (others=>'0'),                      -- btn

    (others=>'0'),                      -- led

    (others=>'0'),                      -- dsp_dat

    (others=>'0'),                      -- dsp_dp

    (others=>'0'),                      -- ledin

    (others=>'0'),                      -- swieff

    (others=>'0'),                      -- btneff

    (others=>'0'),                      -- ledeff

    (others=>'0'),                      -- dpeff

    (others=>'0'),                      -- dateff

    '0','0','0','0'                     -- (swi|led|dsp|dp)_en

  );

  signal R_REGS : regs_type := regs_init;  -- state registers

  signal N_REGS : regs_type := regs_init;  -- next value state regs

  subtype  cntl_rbf_btn      is integer range 11 downto 8;

  constant cntl_rbf_dsp_en:  integer :=  3;

  constant cntl_rbf_dp_en:   integer :=  2;

  constant cntl_rbf_led_en:  integer :=  1;

  constant cntl_rbf_swi_en:  integer :=  0;

  subtype  led_rbf_dp      is integer range 15 downto 12;

  subtype  led_rbf_led     is integer range  7 downto  0;

  constant rbaddr_cntl:  slv2 := "00";  --  0    r/w/-

  constant rbaddr_swi:   slv2 := "01";  --  1    r/w/-

  constant rbaddr_led:   slv2 := "10";  --  2    r/w/-

  constant rbaddr_dsp:   slv2 := "11";  --  3    r/w/-

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

  signal HIO_BTN : slv4 := (others=>'0');

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

  signal HIO_DSP_DAT : slv16 := (others=>'0');

  signal HIO_DSP_DP  : slv4 := (others=>'0');

begin

  HIO : sn_humanio_demu

    generic map (

      DEBOUNCE => DEBOUNCE)

    port map (

      CLK     => CLK,

      RESET   => RESET,

      CE_MSEC => CE_MSEC,

      SWI     => HIO_SWI,

      BTN     => HIO_BTN,

      LED     => HIO_LED,

      DSP_DAT => HIO_DSP_DAT,

      DSP_DP  => HIO_DSP_DP,

      I_SWI   => I_SWI,

      I_BTN   => I_BTN,

      O_LED   => O_LED

    );

  proc_regs: process (CLK)

  begin

    if rising_edge(CLK) then

      if RESET = '1' then

        R_REGS <= regs_init;

      else

        R_REGS <= N_REGS;

      end if;

    end if;

  end process proc_regs;

  proc_next: process (R_REGS, RB_MREQ, LED, DSP_DAT, DSP_DP,

                      HIO_SWI, HIO_BTN, HIO_DSP_DAT, HIO_DSP_DP)

    variable r : regs_type := regs_init;

    variable n : regs_type := regs_init;

    variable irb_ack  : slbit := '0';

    variable irb_busy : slbit := '0';

    variable irb_err  : slbit := '0';

    variable irb_dout : slv16 := (others=>'0');

    variable irbena   : slbit := '0';

  begin

    r := R_REGS;

    n := R_REGS;

    irb_ack  := '0';

    irb_busy := '0';

    irb_err  := '0';

    irb_dout := (others=>'0');

    irbena  := RB_MREQ.re or RB_MREQ.we;

    -- input register for LED signal

    n.ledin  := LED;

    -- rbus address decoder

    n.rbsel := '0';

    if RB_MREQ.aval='1' and RB_MREQ.addr(15 downto 2)=RB_ADDR(15 downto 2) then

      n.rbsel := '1';

    end if;

    -- rbus transactions

    if r.rbsel = '1' then

      irb_ack := irbena;                  -- ack all accesses

      case RB_MREQ.addr(1 downto 0) is

        when rbaddr_cntl =>

          irb_dout(cntl_rbf_btn)    := HIO_BTN;

          irb_dout(cntl_rbf_dsp_en) := r.dsp_en;

          irb_dout(cntl_rbf_dp_en)  := r.dp_en;

          irb_dout(cntl_rbf_led_en) := r.led_en;

          irb_dout(cntl_rbf_swi_en) := r.swi_en;

          if RB_MREQ.we = '1' then

            n.btn    := RB_MREQ.din(cntl_rbf_btn);

            n.dsp_en := RB_MREQ.din(cntl_rbf_dsp_en);

            n.dp_en  := RB_MREQ.din(cntl_rbf_dp_en);

            n.led_en := RB_MREQ.din(cntl_rbf_led_en);

            n.swi_en := RB_MREQ.din(cntl_rbf_swi_en);

          end if;

        when rbaddr_swi =>

          irb_dout(HIO_SWI'range) := HIO_SWI;

          if RB_MREQ.we = '1' then

            n.swi := RB_MREQ.din(n.swi'range);

          end if;

        when rbaddr_led =>

          irb_dout(led_rbf_dp)  := HIO_DSP_DP;

          irb_dout(led_rbf_led) := r.ledin;

          if RB_MREQ.we = '1' then

            n.dsp_dp := RB_MREQ.din(led_rbf_dp);

            n.led    := RB_MREQ.din(led_rbf_led);

          end if;

        when rbaddr_dsp =>

          irb_dout := HIO_DSP_DAT;

          if RB_MREQ.we = '1' then

            n.dsp_dat := RB_MREQ.din;

          end if;

        when others => null;

      end case;

    end if;

    n.btneff := HIO_BTN or r.btn;

    if r.swi_en = '0' then

      n.swieff := HIO_SWI;

    else

      n.swieff := r.swi;

    end if;

    if r.led_en = '0' then

      n.ledeff := r.ledin;

    else

      n.ledeff := r.led;

    end if;

    if r.dp_en = '0' then

      n.dpeff  := DSP_DP;

    else

      n.dpeff  := r.dsp_dp;

    end if;

    if r.dsp_en = '0' then

      n.dateff := DSP_DAT;

    else

      n.dateff := r.dsp_dat;

    end if;

    N_REGS       <= n;

    BTN         <= R_REGS.btneff;

    SWI         <= R_REGS.swieff;

    HIO_LED     <= R_REGS.ledeff;

    HIO_DSP_DP  <= R_REGS.dpeff;

    HIO_DSP_DAT <= R_REGS.dateff;

    RB_SRES      <= rb_sres_init;

    RB_SRES.ack  <= irb_ack;

    RB_SRES.busy <= irb_busy;

    RB_SRES.err  <= irb_err;

    RB_SRES.dout <= irb_dout;

  end process proc_next;

end syn;