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-- $Id: rlink_mon.vhd 609 2014-12-07 19:35:25Z mueller $

--

-- Copyright 2007-2014 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:    rlink_mon - sim

-- Description:    rlink monitor (for tb's)

--

-- Dependencies:   -

-- Test bench:     -

-- Tool versions:  xst 8.2-17.7; ghdl 0.18-0.31

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2014-11-08   602   4.0.2  annotate clobber commas

-- 2014-10-25   599   4.0.1  use writeoptint()

-- 2014-10-12   596   4.0    adopt to new escaping, better 8 bit output

-- 2011-12-23   444   3.1    CLK_CYCLE now integer

-- 2011-11-19   427   3.0.2  now numeric_std clean

-- 2010-12-24   347   3.0.1  rename: CP_*->RL->*

-- 2010-12-22   346   3.0    renamed rritb_cpmon -> rlink_mon

-- 2010-06-11   303   2.5.1  fix data9 assignment, always proper width now

-- 2010-06-07   302   2.5    use sop/eop framing instead of soc+chaining

-- 2008-03-24   129   1.0.1  CLK_CYCLE now 31 bits

-- 2007-09-09    81   1.0    Initial version 

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

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use ieee.std_logic_textio.all;

use std.textio.all;

use work.slvtypes.all;

use work.simlib.all;

use work.rlinklib.all;

use work.comlib.all;

entity rlink_mon is                     -- rlink monitor

  generic (

    DWIDTH : positive :=  9);           -- data port width (8 or 9)

  port (

    CLK  : in slbit;                    -- clock

    CLK_CYCLE : in integer := 0;        -- clock cycle number

    ENA  : in slbit := '1';             -- enable monitor output

    RL_DI : in slv(DWIDTH-1 downto 0);  -- rlink: data in

    RL_ENA : in slbit;                  -- rlink: data enable

    RL_BUSY : in slbit;                 -- rlink: data busy

    RL_DO : in slv(DWIDTH-1 downto 0);  -- rlink: data out

    RL_VAL : in slbit;                  -- rlink: data valid

    RL_HOLD : in slbit                  -- rlink: data hold

  );

end rlink_mon;

architecture sim of rlink_mon is

begin

  assert DWIDTH=8 or DWIDTH=9

    report "assert(DWIDTH=8 or DWIDTH=9)" severity failure;

  proc_moni: process

    variable oline : line;

    variable nbusy : integer := 0;

    variable nhold : integer := 0;

    variable edatarx : boolean := false;

    variable edatatx : boolean := false;

    procedure write_val(L: inout line;

                        data: in slv(DWIDTH-1 downto 0);

                        nwait: in integer;

                        txt1: in string(1 to 2);

                        txt2: in string;

                        edata: in boolean) is

      variable data9 : slv9 := (others=>'0');

      variable optxt : string(1 to 8) := ": ??rx  ";

    begin

      if DWIDTH = 9 then

        optxt(3 to 4) := "rl";

      else

        optxt(3 to 4) := "r8";

      end if;

      optxt(5 to 6) := txt1;

      writetimestamp(L, CLK_CYCLE, optxt);

      if DWIDTH = 9 then

        write(L, data(data'left), right, 1);

      else

        write(L, string'(" "));

      end if;

      write(L, data(7 downto 0), right, 9);

      writeoptint(L, txt2, nwait);

      if DWIDTH=9 and data(data'left)='1' then

        -- a copy to data9 needed to allow following case construct

        -- using data directly gives a 'subtype is not locally static' error

        data9 := (others=>'0');

        data9(data'range) := data;

        write(L, string'("  comma"));

        case data9 is

          when c_rlink_dat_sop  => write(L, string'(" sop"));

          when c_rlink_dat_eop  => write(L, string'(" eop"));

          when c_rlink_dat_nak  => write(L, string'(" nak"));

          when c_rlink_dat_attn => write(L, string'(" attn"));

          when others           => write(L, string'(" clobber|oob"));

        end case;

      end if;

      if DWIDTH = 8 then

        if edata then

          write(L, string'("  edata"));

          if data(c_cdata_edf_pref) /= c_cdata_ed_pref or

             (not data(c_cdata_edf_eci)) /= data(c_cdata_edf_ec) then

            write(L, string'(" FAIL: bad format"));

          else

            write(L, string'(" ec="));

            write(L, data(c_cdata_edf_ec));

            data9 := (others=>'0');

            data9(8) := '1';

            data9(c_cdata_edf_ec) := data(c_cdata_edf_ec);

            case data9 is

              when c_rlink_dat_sop  => write(L, string'(" (sop)"));

              when c_rlink_dat_eop  => write(L, string'(" (eop)"));

              when c_rlink_dat_nak  => write(L, string'(" (nak)"));

              when c_rlink_dat_attn => write(L, string'(" (attn)"));

              when "100000" & c_cdata_ec_xon  => write(L, string'(" (xon)"));

              when "100000" & c_cdata_ec_xoff => write(L, string'(" (xoff)"));

              when "100000" & c_cdata_ec_fill => write(L, string'(" (fill)"));

              when "100000" & c_cdata_ec_esc  => write(L, string'(" (esc)"));

              when others =>

                write(L, string'(" FAIL: bad ec"));

            end case;

          end if;

        end if;

        if data = c_cdata_escape then

          write(L, string'("  escape"));

        end if;

      end if;

      writeline(output, L);

    end procedure write_val;

  begin

    loop

      if ENA='0' then                   -- if disabled

        wait until ENA='1';             -- stall process till enabled

      end if;

      wait until rising_edge(CLK); -- check at end of clock cycle

      if RL_ENA = '1' then

        if RL_BUSY = '1' then

          nbusy := nbusy + 1;

        else

          write_val(oline, RL_DI, nbusy, "rx", "  nbusy=", edatarx);

          edatarx := RL_DI=c_cdata_escape;

          nbusy   := 0;

        end if;

      else

        nbusy := 0;

      end if;

      if RL_VAL = '1' then

        if RL_HOLD = '1' then

          nhold := nhold + 1;

        else

          write_val(oline, RL_DO, nhold, "tx", "  nhold=", edatatx);

          edatatx := RL_DO=c_cdata_escape;

          nhold   := 0;

        end if;

      else

        nhold := 0;

      end if;

    end loop;

  end process proc_moni;

end sim;