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-- $Id: sys_tst_rlink_cuff_n2.vhd 476 2013-01-26 22:23:53Z mueller $

--

-- Copyright 2012-2013 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_cuff_n2 - syn

-- Description:    rlink tester design for nexys2 with fx2 interface

--

-- Dependencies:   vlib/xlib/dcm_sfs

--                 vlib/genlib/clkdivce

--                 bplib/bpgen/bp_rs232_2l4l_iob

--                 bplib/bpgen/sn_humanio_rbus

--                 bplib/fx2lib/fx2_2fifoctl_as   [sys_conf_fx2_type="as2"]

--                 bplib/fx2lib/fx2_2fifoctl_ic   [sys_conf_fx2_type="ic2"]

--                 bplib/fx2lib/fx2_3fifoctl_ic   [sys_conf_fx2_type="ic3"]

--                 tst_rlink_cuff

--                 bplib/nxcramlib/nx_cram_dummy

--

-- Test bench:     -

--

-- Target Devices: generic

-- Tool versions:  xst 13.3; ghdl 0.29

--

-- Synthesized (xst):

-- Date         Rev  ise         Target      flop lutl lutm slic t peri ctl/MHz

-- 2013-01-04   469 13.3    O76d xc3s1200e-4  846  1798 160 1215 p 16.3 ic2/ 50

-- 2012-12-29   466 13.3    O76d xc3s1200e-4  808  1739 160 1172 p 16.3 as2/ 50

-- 2013-01-02   467 13.3    O76d xc3s1200e-4  843  1792 160 1209 p 15.2 ic2/ 50

-- 2012-12-29   466 13.3    O76d xc3s1200e-4  863  1850 192 1266 p 13.6 ic3/ 50

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2012-12-29   466   1.0    Initial version; derived from sys_tst_fx2loop_n2

--                           the now obsoleted sys_tst_rlink_n2_cuff design

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

-- Usage of Nexys 2 Switches, Buttons, LEDs:

--

--    SWI(7:3)  no function (only connected to sn_humanio_rbus)

--       (2)    0 -> int/ext RS242 port for rlink

--              1 -> use USB interface for rlink

--       (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)

--    for SWI(2)='0' (serport)

--    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)

--    for SWI(2)='1' (fx2)

--    DP(3)     FX2_TX2BUSY             (shows tx2 back preasure)

--      (2)     FX2_TX2ENA(stretched)   (shows tx2 activity)

--      (1)     FX2_TXENA(streched)     (shows tx activity)

--      (0)     FX2_RXVAL(stretched)    (shows rx activity)

--

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.slvtypes.all;

use work.xlib.all;

use work.genlib.all;

use work.bpgenlib.all;

use work.bpgenrbuslib.all;

use work.rblib.all;

use work.fx2lib.all;

use work.nxcramlib.all;

use work.sys_conf.all;

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

entity sys_tst_rlink_cuff_n2 is         -- top level

                                        -- implements nexys2_fusp_cuff_aif

  port (

    I_CLK50 : in slbit;                 -- 50 MHz board 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

    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 sys_tst_rlink_cuff_n2;

architecture syn of sys_tst_rlink_cuff_n2 is

  signal CLK :   slbit := '0';

  signal RESET : slbit := '0';

  signal CE_USEC :  slbit := '0';

  signal CE_MSEC :  slbit := '0';

  signal RXSD  : slbit := '0';

  signal TXSD  : slbit := '0';

  signal CTS_N : slbit := '0';

  signal RTS_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 RB_MREQ : rb_mreq_type := rb_mreq_init;

  signal RB_SRES_HIO : rb_sres_type := rb_sres_init;

  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 FX2_TX2DATA  : slv8 := (others=>'0');

  signal FX2_TX2ENA   : slbit := '0';

  signal FX2_TX2BUSY  : slbit := '0';

  signal FX2_TX2AFULL : slbit := '0';

  signal FX2_MONI  : fx2ctl_moni_type := fx2ctl_moni_init;

  constant rbaddr_hio   : slv8 := "11000000"; -- 110000xx

begin

  assert (sys_conf_clksys mod 1000000) = 0

    report "assert sys_conf_clksys on MHz grid"

    severity failure;

  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,                    -- good for up to 127 MHz !

      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      => RXSD,

      TXD      => TXSD,

      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

    );

  FX2_CNTL_AS : if sys_conf_fx2_type = "as2" generate

    CNTL : fx2_2fifoctl_as

      generic map (

        RXFAWIDTH  => 5,

        TXFAWIDTH  => 5,

        CCWIDTH    => sys_conf_fx2_ccwidth,

        RXAEMPTY_THRES => 1,

        TXAFULL_THRES  => 1,

        PETOWIDTH  => sys_conf_fx2_petowidth,

        RDPWLDELAY => sys_conf_fx2_rdpwldelay,

        RDPWHDELAY => sys_conf_fx2_rdpwhdelay,

        WRPWLDELAY => sys_conf_fx2_wrpwldelay,

        WRPWHDELAY => sys_conf_fx2_wrpwhdelay,

        FLAGDELAY  => sys_conf_fx2_flagdelay)

      port map (

        CLK      => CLK,

        CE_USEC  => CE_USEC,

        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

      );

  end generate FX2_CNTL_AS;

  FX2_CNTL_IC : if sys_conf_fx2_type = "ic2" generate

    CNTL : fx2_2fifoctl_ic

      generic map (

        RXFAWIDTH  => 5,

        TXFAWIDTH  => 5,

        PETOWIDTH  => sys_conf_fx2_petowidth,

        CCWIDTH    => sys_conf_fx2_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

      );

  end generate FX2_CNTL_IC;

  FX2_CNTL_IC3 : if sys_conf_fx2_type = "ic3" generate

    CNTL : fx2_3fifoctl_ic

      generic map (

        RXFAWIDTH  => 5,

        TXFAWIDTH  => 5,

        PETOWIDTH  => sys_conf_fx2_petowidth,

        CCWIDTH    => sys_conf_fx2_ccwidth,

        RXAEMPTY_THRES => 1,

        TXAFULL_THRES  => 1,

        TX2AFULL_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,

        TX2DATA  => FX2_TX2DATA,

        TX2ENA   => FX2_TX2ENA,

        TX2BUSY  => FX2_TX2BUSY,

        TX2AFULL => FX2_TX2AFULL,

        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

      );

  end generate FX2_CNTL_IC3;

  TST : entity work.tst_rlink_cuff

    port map (

      CLK         => CLK,

      RESET       => '0',

      CE_USEC     => CE_USEC,

      CE_MSEC     => CE_MSEC,

      RB_MREQ_TOP => RB_MREQ,

      RB_SRES_TOP => RB_SRES_HIO,

      SWI         => SWI,

      BTN         => BTN,

      LED         => LED,

      DSP_DAT     => DSP_DAT,

      DSP_DP      => DSP_DP,

      RXSD        => RXSD,

      TXSD        => TXSD,

      RTS_N       => RTS_N,

      CTS_N       => CTS_N,

      FX2_RXDATA  => FX2_RXDATA,

      FX2_RXVAL   => FX2_RXVAL,

      FX2_RXHOLD  => FX2_RXHOLD,

      FX2_TXDATA  => FX2_TXDATA,

      FX2_TXENA   => FX2_TXENA,

      FX2_TXBUSY  => FX2_TXBUSY,

      FX2_TX2DATA => FX2_TX2DATA,

      FX2_TX2ENA  => FX2_TX2ENA,

      FX2_TX2BUSY => FX2_TX2BUSY,

      FX2_MONI    => FX2_MONI

    );

  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

end syn;