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-- $Id: sys_tst_sram_n3.vhd 791 2016-07-21 22:01:10Z mueller $
--
-- Copyright 2011-2016 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_sram_n3 - syn
-- Description:    test of nexys3 sram and its controller
--
-- Dependencies:   vlib/xlib/s6_cmt_sfs
--                 vlib/genlib/clkdivce
--                 bplib/bpgen/bp_rs232_2l4l_iob
--                 bplib/bpgen/sn_humanio
--                 vlib/rlink/rlink_sp1c
--                 tst_sram
--                 bplib/nxcramlib/nx_cram_memctl_as
--
-- Test bench:     tb/tb_tst_sram_n3
--
-- Target Devices: generic
-- Tool versions:  xst 13.1-14.7; ghdl 0.29-0.33
--
-- Synthesized (xst):
-- Date         Rev  ise         Target      flop lutl lutm slic t peri
-- 2014-12-20   614 14.7  131013 xc6slx16-2   922 1574   48  574 t  9.6 ns
-- 2014-08-13   581 14.7  131013 xc6slx16-2   765 1261   32  441 t  9.6 ns
-- 2011-12-21   442 13.4    O40d xc6slx16-2   722 1367   32  506 t  9.6 ns
-- 2011-11-27   433 13.4    O40d xc6slx16-2   699 1194   20  406 t  8.9 ns
--
-- Revision History: 
-- Date         Rev Version  Comment
-- 2016-07-10   785   1.5.1  SWI(1) now XON; SWI(0) now portsel
-- 2016-07-09   784   1.5    tst_sram with AWIDTH and 22bit support
-- 2016-03-19   748   1.4.2  define rlink SYSID
-- 2015-04-11   666   1.4.1  rearrange XON handling
-- 2014-08-28   588   1.4    use new rlink v4 iface and 4 bit STAT
-- 2014-08-15   583   1.3    rb_mreq addr now 16 bit
-- 2013-10-06   538   1.2    pll support, use clksys_vcodivide ect
-- 2011-12-21   442   1.1.1  use rlink_sp1c
-- 2011-12-03   435   1.1    use int&ext serport and bp_rs232_2l4l_iob
-- 2011-11-27   433   1.0    Initial version (derived from sys_tst_sram_n2)
------------------------------------------------------------------------------
 
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.serportlib.all;
use work.rblib.all;
use work.rlinklib.all;
use work.bpgenlib.all;
use work.s3boardlib.all;
use work.nxcramlib.all;
use work.sys_conf.all;
 
-- ----------------------------------------------------------------------------
 
entity sys_tst_sram_n3 is               -- top level
                                        -- implements nexys3_fusp_aif
  port (
    I_CLK100 : in slbit;                -- 100 MHz clock
    I_RXD : in slbit;                   -- receive data (board view)
    O_TXD : out slbit;                  -- transmit data (board view)
    I_SWI : in slv8;                    -- n3 switches
    I_BTN : in slv5;                    -- n3 buttons
    O_LED : out slv8;                   -- n3 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_PPCM_CE_N : out slbit;            -- ppcm: ...
    O_PPCM_RST_N : out slbit;           -- ppcm: ...
    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_sram_n3;
 
architecture syn of sys_tst_sram_n3 is
 
  signal CLK :   slbit := '0';
 
  signal CE_USEC :  slbit := '0';
  signal CE_MSEC :  slbit := '0';
 
  signal GBL_RESET : slbit := '0';
 
  signal RXD :   slbit := '1';
  signal TXD :   slbit := '0';
  signal CTS_N : slbit := '0';
  signal RTS_N : slbit := '0';
 
  signal SWI     : slv8  := (others=>'0');
  signal BTN     : slv5  := (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 : rb_sres_type := rb_sres_init;
  signal RB_LAM  : slv16 := (others=>'0');
  signal RB_STAT : slv4 := (others=>'0');
 
  signal SER_MONI : serport_moni_type := serport_moni_init;
 
  signal RB_SRES_TST : rb_sres_type := rb_sres_init;
  signal RB_LAM_TST  : slbit := '0';
 
  signal MEM_RESET : slbit := '0';
  signal MEM_REQ   : slbit := '0';
  signal MEM_WE    : slbit := '0';
  signal MEM_BUSY  : slbit := '0';
  signal MEM_ACK_R : slbit := '0';
  signal MEM_ACK_W : slbit := '0';
  signal MEM_ACT_R : slbit := '0';
  signal MEM_ACT_W : slbit := '0';
  signal MEM_ADDR  : slv22 := (others=>'0');
  signal MEM_BE    : slv4  := (others=>'0');
  signal MEM_DI    : slv32 := (others=>'0');
  signal MEM_DO    : slv32 := (others=>'0');
 
  constant sysid_proj  : slv16 := x"0104";   -- tst_sram
  constant sysid_board : slv8  := x"03";     -- nexys3
  constant sysid_vers  : slv8  := x"00";
 
begin
 
  GEN_CLKSYS : s6_cmt_sfs
    generic map (
      VCO_DIVIDE     => sys_conf_clksys_vcodivide,
      VCO_MULTIPLY   => sys_conf_clksys_vcomultiply,
      OUT_DIVIDE     => sys_conf_clksys_outdivide,
      CLKIN_PERIOD   => 10.0,
      CLKIN_JITTER   => 0.01,
      STARTUP_WAIT   => false,
      GEN_TYPE       => sys_conf_clksys_gentype)
    port map (
      CLKIN   => I_CLK100,
      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      => 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
    generic map (
      BWIDTH   => 5)
    port map (
      CLK     => CLK,
      RESET   => '0',
      CE_MSEC => CE_MSEC,
      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 (
      BTOWIDTH     => 6,                --  64 cycles access timeout
      RTAWIDTH     => 12,
      SYSID        => sysid_proj & sysid_board & sysid_vers,
      IFAWIDTH     => 5,                --  32 word input fifo
      OFAWIDTH     => 5,                --  32 word output fifo
      ENAPIN_RLMON => sbcntl_sbf_rlmon,
      ENAPIN_RBMON => sbcntl_sbf_rbmon,
      CDWIDTH      => 13,
      CDINIT       => sys_conf_ser2rri_cdinit,
      RBMON_AWIDTH => 0,
      RBMON_RBADDR => x"ffe8")
    port map (
      CLK      => CLK,
      CE_USEC  => CE_USEC,
      CE_MSEC  => CE_MSEC,
      CE_INT   => CE_MSEC,
      RESET    => GBL_RESET,
      ENAXON   => SWI(1),
      ESCFILL  => '0',
      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
    );
 
  TST : entity work.tst_sram
    generic map (
      RB_ADDR => slv(to_unsigned(2#0000000000000000#,16)),
      AWIDTH  => 22)
    port map (
      CLK       => CLK,
      RESET     => GBL_RESET,
      RB_MREQ   => RB_MREQ,
      RB_SRES   => RB_SRES_TST,
      RB_STAT   => RB_STAT,
      RB_LAM    => RB_LAM_TST,
      SWI       => SWI,
      BTN       => BTN(3 downto 0),
      LED       => LED,
      DSP_DAT   => DSP_DAT,
      MEM_RESET => MEM_RESET,
      MEM_REQ   => MEM_REQ,
      MEM_WE    => MEM_WE,
      MEM_BUSY  => MEM_BUSY,
      MEM_ACK_R => MEM_ACK_R,
      MEM_ACK_W => MEM_ACK_W,
      MEM_ACT_R => MEM_ACT_R,
      MEM_ACT_W => MEM_ACT_W,
      MEM_ADDR  => MEM_ADDR,
      MEM_BE    => MEM_BE,
      MEM_DI    => MEM_DI,
      MEM_DO    => MEM_DO
    );
 
  CRAMCTL : nx_cram_memctl_as
    generic map (
      READ0DELAY => sys_conf_memctl_read0delay,   -- was 2 for 50 MHz
      READ1DELAY => sys_conf_memctl_read1delay,   -- was 2 "
      WRITEDELAY => sys_conf_memctl_writedelay)   -- was 3 "
    port map (
      CLK     => CLK,
      RESET   => MEM_RESET,
      REQ     => MEM_REQ,
      WE      => MEM_WE,
      BUSY    => MEM_BUSY,
      ACK_R   => MEM_ACK_R,
      ACK_W   => MEM_ACK_W,
      ACT_R   => MEM_ACT_R,
      ACT_W   => MEM_ACT_W,
      ADDR    => MEM_ADDR,
      BE      => MEM_BE,
      DI      => MEM_DI,
      DO      => MEM_DO,
      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_PPCM_CE_N  <= '1';                  -- keep parallel PCM memory disabled
  O_PPCM_RST_N <= '1';                  --
 
  RB_SRES   <= RB_SRES_TST;             -- can be sres_or later...
  RB_LAM(0) <= RB_LAM_TST;
 
  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;
 
end syn;