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-- $Id: sys_tst_rlink_n2.vhd 476 2013-01-26 22:23:53Z mueller $
--
-- Copyright 2010-2011 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:    sys_tst_rlink_n2 - syn
-- Description:    rlink tester design for nexys2
--
-- Dependencies:   vlib/xlib/dcm_sfs
--                 vlib/genlib/clkdivce
--                 bplib/bpgen/bp_rs232_2l4l_iob
--                 bplib/bpgen/sn_humanio_rbus
--                 vlib/rlink/rlink_sp1c
--                 rbd_tst_rlink
--                 vlib/rbus/rb_sres_or_2
--                 vlib/nxcramlib/nx_cram_dummy
--
-- Test bench:     tb/tb_tst_rlink_n2
--
-- Target Devices: generic
-- Tool versions:  xst 12.1, 13.1; ghdl 0.29
--
-- Synthesized (xst):
-- Date         Rev  ise         Target      flop lutl lutm slic t peri
-- 2012-12-27   453 13.3    O76d xc3s1200e-4  754 1605   96 1057 t 14.5
-- 2011-12-18   440 13.1    O40d xc3s1200e-4  754 1605   96 1057 t 16.8
-- 2011-06-26   385 12.1    M53d xc3s1200e-4  688 1500   68  993 t 16.2
-- 2011-04-02   375 12.1    M53d xc3s1200e-4  688 1572   68  994 t 13.8
-- 2010-12-29   351 12.1    M53d xc3s1200e-4  604 1298   68  851 t 14.7
--
-- Revision History: 
-- Date         Rev Version  Comment
-- 2011-12-23   444   1.2    remove clksys output hack
-- 2011-12-18   440   1.1.6  use now rbd_tst_rlink and rlink_sp1c
-- 2011-11-26   433   1.1.5  use nx_cram_dummy now
-- 2011-11-23   432   1.1.4  update O_FLA_CE_N usage
-- 2011-11-17   426   1.1.3  use dcm_sfs now
-- 2011-07-09   391   1.1.2  use now bp_rs232_2l4l_iob
-- 2011-07-08   390   1.1.1  use now sn_humanio
-- 2011-06-26   385   1.1    move s3_humanio_rbus from tst_rlink to top level
-- 2010-12-29   351   1.0    Initial version
------------------------------------------------------------------------------
-- Usage of Nexys 2 Switches, Buttons, LEDs:
--
--    SWI(7:2)  no function (only connected to sn_humanio_rbus)
--       (1)    1 enable XON
--       (0)    0 -> main board RS232 port  - implemented in bp_rs232_2l4l_iob
--              1 -> Pmod B/top RS232 port  /
--
--    LED(7)    SER_MONI.abact
--       (6:2)  no function (only connected to sn_humanio_rbus)
--       (0)    timer 0 busy 
--       (1)    timer 1 busy 
--
--    DSP:      SER_MONI.clkdiv         (from auto bauder)
--    DP(3)     not SER_MONI.txok       (shows tx back preasure)
--      (2)     SER_MONI.txact          (shows tx activity)
--      (1)     not SER_MONI.rxok       (shows rx back preasure)
--      (0)     SER_MONI.rxact          (shows rx activity)
--
 
library ieee;
use ieee.std_logic_1164.all;
 
use work.slvtypes.all;
use work.xlib.all;
use work.genlib.all;
use work.serportlib.all;
use work.rblib.all;
use work.rlinklib.all;
use work.bpgenlib.all;
use work.bpgenrbuslib.all;
use work.nxcramlib.all;
use work.sys_conf.all;
 
-- ----------------------------------------------------------------------------
 
entity sys_tst_rlink_n2 is              -- top level
                                        -- implements nexys2_fusp_aif
  port (
    I_CLK50 : in slbit;                 -- 50 MHz clock
    I_RXD : in slbit;                   -- receive data (board view)
    O_TXD : out slbit;                  -- transmit data (board view)
    I_SWI : in slv8;                    -- n2 switches
    I_BTN : in slv4;                    -- n2 buttons
    O_LED : out slv8;                   -- n2 leds
    O_ANO_N : out slv4;                 -- 7 segment disp: anodes   (act.low)
    O_SEG_N : out slv8;                 -- 7 segment disp: segments (act.low)
    O_MEM_CE_N : out slbit;             -- cram: chip enable   (act.low)
    O_MEM_BE_N : out slv2;              -- cram: byte enables  (act.low)
    O_MEM_WE_N : out slbit;             -- cram: write enable  (act.low)
    O_MEM_OE_N : out slbit;             -- cram: output enable (act.low)
    O_MEM_ADV_N  : out slbit;           -- cram: address valid (act.low)
    O_MEM_CLK : out slbit;              -- cram: clock
    O_MEM_CRE : out slbit;              -- cram: command register enable
    I_MEM_WAIT : in slbit;              -- cram: mem wait
    O_MEM_ADDR  : out slv23;            -- cram: address lines
    IO_MEM_DATA : inout slv16;          -- cram: data lines
    O_FLA_CE_N : out slbit;             -- flash ce..          (act.low)
    O_FUSP_RTS_N : out slbit;           -- fusp: rs232 rts_n
    I_FUSP_CTS_N : in slbit;            -- fusp: rs232 cts_n
    I_FUSP_RXD : in slbit;              -- fusp: rs232 rx
    O_FUSP_TXD : out slbit              -- fusp: rs232 tx
  );
end sys_tst_rlink_n2;
 
architecture syn of sys_tst_rlink_n2 is
 
  signal CLK :   slbit := '0';
 
  signal RXD :   slbit := '1';
  signal TXD :   slbit := '0';
  signal RTS_N : slbit := '0';
  signal CTS_N : slbit := '0';
 
  signal SWI     : slv8  := (others=>'0');
  signal BTN     : slv4  := (others=>'0');
  signal LED     : slv8  := (others=>'0');
  signal DSP_DAT : slv16 := (others=>'0');
  signal DSP_DP  : slv4  := (others=>'0');
 
  signal RESET   : slbit := '0';
  signal CE_USEC : slbit := '0';
  signal CE_MSEC : slbit := '0';
 
  signal RB_MREQ : rb_mreq_type := rb_mreq_init;
  signal RB_SRES : rb_sres_type := rb_sres_init;
  signal RB_SRES_HIO : rb_sres_type := rb_sres_init;
  signal RB_SRES_TST : rb_sres_type := rb_sres_init;
 
  signal RB_LAM  : slv16 := (others=>'0');
  signal RB_STAT : slv3  := (others=>'0');
 
  signal SER_MONI : serport_moni_type := serport_moni_init;
  signal STAT    : slv8  := (others=>'0');
 
  constant rbaddr_hio   : slv8 := "11000000"; -- 110000xx
 
begin
 
  assert (sys_conf_clksys mod 1000000) = 0
    report "assert sys_conf_clksys on MHz grid"
    severity failure;
 
  RESET <= '0';                         -- so far not used
 
  DCM : dcm_sfs
    generic map (
      CLKFX_DIVIDE   => sys_conf_clkfx_divide,
      CLKFX_MULTIPLY => sys_conf_clkfx_multiply,
      CLKIN_PERIOD   => 20.0)
    port map (
      CLKIN   => I_CLK50,
      CLKFX   => CLK,
      LOCKED  => open
    );
 
  CLKDIV : clkdivce
    generic map (
      CDUWIDTH => 7,
      USECDIV  => sys_conf_clksys_mhz,
      MSECDIV  => 1000)
    port map (
      CLK     => CLK,
      CE_USEC => CE_USEC,
      CE_MSEC => CE_MSEC
    );
 
  IOB_RS232 : bp_rs232_2l4l_iob
    port map (
      CLK      => CLK,
      RESET    => '0',
      SEL      => SWI(0),
      RXD      => RXD,
      TXD      => TXD,
      CTS_N    => CTS_N,
      RTS_N    => RTS_N,
      I_RXD0   => I_RXD,
      O_TXD0   => O_TXD,
      I_RXD1   => I_FUSP_RXD,
      O_TXD1   => O_FUSP_TXD,
      I_CTS1_N => I_FUSP_CTS_N,
      O_RTS1_N => O_FUSP_RTS_N
    );
 
  HIO : sn_humanio_rbus
    generic map (
      DEBOUNCE => sys_conf_hio_debounce,
      RB_ADDR  => rbaddr_hio)
    port map (
      CLK     => CLK,
      RESET   => RESET,
      CE_MSEC => CE_MSEC,
      RB_MREQ => RB_MREQ,
      RB_SRES => RB_SRES_HIO,
      SWI     => SWI,                   
      BTN     => BTN,                   
      LED     => LED,                   
      DSP_DAT => DSP_DAT,               
      DSP_DP  => DSP_DP,
      I_SWI   => I_SWI,                 
      I_BTN   => I_BTN,
      O_LED   => O_LED,
      O_ANO_N => O_ANO_N,
      O_SEG_N => O_SEG_N
    );
 
  RLINK : rlink_sp1c
    generic map (
      ATOWIDTH     => 6,
      ITOWIDTH     => 6,
      CPREF        => c_rlink_cpref,
      IFAWIDTH     => 5,
      OFAWIDTH     => 5,
      ENAPIN_RLMON => sbcntl_sbf_rlmon,
      ENAPIN_RBMON => sbcntl_sbf_rbmon,
      CDWIDTH      => 15,
      CDINIT       => sys_conf_ser2rri_cdinit)
    port map (
      CLK      => CLK,
      CE_USEC  => CE_USEC,
      CE_MSEC  => CE_MSEC,
      CE_INT   => CE_MSEC,
      RESET    => RESET,
      ENAXON   => SWI(1),
      ENAESC   => SWI(1),
      RXSD     => RXD,
      TXSD     => TXD,
      CTS_N    => CTS_N,
      RTS_N    => RTS_N,
      RB_MREQ  => RB_MREQ,
      RB_SRES  => RB_SRES,
      RB_LAM   => RB_LAM,
      RB_STAT  => RB_STAT,
      RL_MONI  => open,
      SER_MONI => SER_MONI
    );
 
  RBDTST : entity work.rbd_tst_rlink
    port map (
      CLK         => CLK,
      RESET       => RESET,
      CE_USEC     => CE_USEC,
      RB_MREQ     => RB_MREQ,
      RB_SRES     => RB_SRES_TST,
      RB_LAM      => RB_LAM,
      RB_STAT     => RB_STAT,
      RB_SRES_TOP => RB_SRES,
      RXSD        => RXD,
      RXACT       => SER_MONI.rxact,
      STAT        => STAT
    );
 
  RB_SRES_OR1 : rb_sres_or_2
    port map (
      RB_SRES_1  => RB_SRES_HIO,
      RB_SRES_2  => RB_SRES_TST,
      RB_SRES_OR => RB_SRES
    );
 
  SRAM_PROT : nx_cram_dummy            -- connect CRAM to protection dummy
    port map (
      O_MEM_CE_N  => O_MEM_CE_N,
      O_MEM_BE_N  => O_MEM_BE_N,
      O_MEM_WE_N  => O_MEM_WE_N,
      O_MEM_OE_N  => O_MEM_OE_N,
      O_MEM_ADV_N => O_MEM_ADV_N,
      O_MEM_CLK   => O_MEM_CLK,
      O_MEM_CRE   => O_MEM_CRE,
      I_MEM_WAIT  => I_MEM_WAIT,
      O_MEM_ADDR  => O_MEM_ADDR,
      IO_MEM_DATA => IO_MEM_DATA
    );
 
  O_FLA_CE_N  <= '1';                   -- keep Flash memory disabled
 
  DSP_DAT   <= SER_MONI.abclkdiv;
 
  DSP_DP(3) <= not SER_MONI.txok;
  DSP_DP(2) <= SER_MONI.txact;
  DSP_DP(1) <= not SER_MONI.rxok;
  DSP_DP(0) <= SER_MONI.rxact;
 
  LED(7) <= SER_MONI.abact;
  LED(6 downto 2) <= (others=>'0');
  LED(1) <= STAT(1);
  LED(0) <= STAT(0);
 
end syn;