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

--  LEON3 Demonstration design test bench

--  Copyright (C) 2004 Jiri Gaisler, Gaisler Research

--

--  This program is free software; you can redistribute it and/or modify

--  it under the terms of the GNU General Public License as published by

--  the Free Software Foundation; either version 2 of the License, 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 more details.

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

library ieee;

use ieee.std_logic_1164.all;

library gaisler;

use gaisler.libdcom.all;

use gaisler.sim.all;

library techmap;

use techmap.gencomp.all;

library micron;

use micron.components.all;

use work.debug.all;

use work.config.all;    -- configuration

entity testbench is

  generic (

    fabtech   : integer := CFG_FABTECH;

    memtech   : integer := CFG_MEMTECH;

    padtech   : integer := CFG_PADTECH;

    clktech   : integer := CFG_CLKTECH;

    ncpu      : integer := CFG_NCPU;

    disas     : integer := CFG_DISAS;   -- Enable disassembly to console

    dbguart   : integer := CFG_DUART;   -- Print UART on console

    pclow     : integer := CFG_PCLOW;

    clkperiod : integer := 25;          -- system clock period

    romwidth  : integer := 32;          -- rom data width (8/32)

    romdepth  : integer := 16;          -- rom address depth

    sramwidth  : integer := 32;         -- ram data width (8/16/32)

    sramdepth  : integer := 18;         -- ram address depth

    srambanks  : integer := 2           -- number of ram banks

  );

  port (

    pci_rst     : inout std_logic;      -- PCI bus

    pci_clk     : in std_logic;

    pci_gnt     : in std_logic;

    pci_idsel   : in std_logic;

    pci_lock    : inout std_logic;

    pci_ad      : inout std_logic_vector(31 downto 0);

    pci_cbe     : inout std_logic_vector(3 downto 0);

    pci_frame   : inout std_logic;

    pci_irdy    : inout std_logic;

    pci_trdy    : inout std_logic;

    pci_devsel  : inout std_logic;

    pci_stop    : inout std_logic;

    pci_perr    : inout std_logic;

    pci_par     : inout std_logic;

    pci_req     : inout std_logic;

    pci_serr    : inout std_logic;

    pci_host    : in std_logic;

    pci_66      : in std_logic

  );

end;

architecture behav of testbench is

constant promfile  : string := "prom.srec";  -- rom contents

constant sramfile  : string := "sram.srec";  -- ram contents

constant sdramfile : string := "sdram.srec"; -- sdram contents

signal sys_clk : std_logic := '0';

signal sys_rst_in : std_logic := '0';                    -- Reset

constant ct : integer := clkperiod/2;

signal errorn   : std_logic;

signal address : std_logic_vector(27 downto 0);

signal data : std_logic_vector(15 downto 0);

signal xdata : std_logic_vector(31 downto 0);

signal romsn    : std_logic;

signal iosn : std_logic;

signal writen, read     : std_logic;

signal oen      : std_logic;

signal flash_rstn       : std_logic;

signal ddr_clk          : std_logic_vector(1 downto 0);

signal ddr_clkb         : std_logic_vector(1 downto 0);

signal ddr_clk_fb  : std_logic;

signal ddr_clk_fb_out  : std_logic;

signal ddr_cke          : std_logic_vector(1 downto 0);

signal ddr_csb          : std_logic_vector(1 downto 0);

signal ddr_web          : std_logic;                       -- ddr write enable

signal ddr_rasb         : std_logic;                       -- ddr ras

signal ddr_casb         : std_logic;                       -- ddr cas

signal ddr_dm           : std_logic_vector (7 downto 0);    -- ddr dm

signal ddr_dqs          : std_logic_vector (7 downto 0);    -- ddr dqs

signal ddr_ad      : std_logic_vector (12 downto 0);   -- ddr address

signal ddr_ba      : std_logic_vector (1 downto 0);    -- ddr bank address

signal ddr_dq  : std_logic_vector (63 downto 0);   -- ddr data

signal txd1     : std_logic;                    -- UART1 tx data

signal rxd1     : std_logic;                    -- UART1 rx data

signal gpio         : std_logic_vector(31 downto 0);     -- I/O port

signal flash_cex : std_logic;

signal clk125      : std_logic := '0';

signal GND      : std_logic := '0';

signal VCC      : std_logic := '1';

signal NC       : std_logic := 'Z';

constant lresp : boolean := false;

signal dsuen    : std_logic;

signal dsubre   : std_logic;

signal dsuact   : std_logic;

begin

-- clock and reset

  sys_clk <= not sys_clk after ct * 1 ns;

  sys_rst_in <= '0', '1' after 200 ns;

  rxd1 <= 'H'; errorn <= 'H';

  ddr_clk_fb <= ddr_clk_fb_out;

  clk125 <= not clk125 after 6.75 ns;

  cpu : entity work.leon3mp

      generic map ( fabtech, memtech, padtech, ncpu, disas, dbguart, pclow )

      port map ( sys_rst_in, sys_clk, clk125, errorn, flash_rstn, address,

        data, dsuen, dsubre, dsuact, oen, writen, read, iosn, romsn,

        ddr_clk, ddr_clkb, ddr_clk_fb, ddr_clk_fb_out, ddr_cke, ddr_csb,

        ddr_web, ddr_rasb, ddr_casb, ddr_dm, ddr_dqs, ddr_ad, ddr_ba, ddr_dq,

        txd1, rxd1,

--      gpio,

        pci_rst, pci_clk, pci_gnt, pci_idsel, pci_lock, pci_ad, pci_cbe,

        pci_frame, pci_irdy, pci_trdy, pci_devsel, pci_stop, pci_perr, pci_par,

        pci_req, pci_serr, pci_host, pci_66

        );

  ddrmem : for i in 0 to 1 generate

    u3 : mt46v16m16

    generic map (index => 3, fname => sdramfile, bbits => 64)

    PORT MAP(

      Dq => ddr_dq(15 downto 0), Dqs => ddr_dqs(1 downto 0), Addr => ddr_ad,

      Ba => ddr_ba, Clk => ddr_clk(i),  Clk_n => ddr_clkb(i), Cke => ddr_cke(i),

      Cs_n => ddr_csb(i), Ras_n => ddr_rasb, Cas_n => ddr_casb, We_n => ddr_web,

      Dm => ddr_dm(1 downto 0));

    u2 : mt46v16m16

    generic map (index => 2, fname => sdramfile, bbits => 64)

    PORT MAP(

      Dq => ddr_dq(31 downto 16), Dqs => ddr_dqs(3 downto 2), Addr => ddr_ad,

      Ba => ddr_ba, Clk => ddr_clk(i),  Clk_n => ddr_clkb(i), Cke => ddr_cke(i),

      Cs_n => ddr_csb(i), Ras_n => ddr_rasb, Cas_n => ddr_casb, We_n => ddr_web,

      Dm => ddr_dm(3 downto 2));

    u1 : mt46v16m16

    generic map (index => 1, fname => sdramfile, bbits => 64)

    PORT MAP(

      Dq => ddr_dq(47 downto 32), Dqs => ddr_dqs(5 downto 4), Addr => ddr_ad,

      Ba => ddr_ba, Clk => ddr_clk(i),  Clk_n => ddr_clkb(i), Cke => ddr_cke(i),

      Cs_n => ddr_csb(i), Ras_n => ddr_rasb, Cas_n => ddr_casb, We_n => ddr_web,

      Dm => ddr_dm(5 downto 4));

    u0 : mt46v16m16

    generic map (index => 0, fname => sdramfile, bbits => 64)

    PORT MAP(

      Dq => ddr_dq(63 downto 48), Dqs => ddr_dqs(7 downto 6), Addr => ddr_ad,

      Ba => ddr_ba, Clk => ddr_clk(i),  Clk_n => ddr_clkb(i), Cke => ddr_cke(i),

      Cs_n => ddr_csb(i), Ras_n => ddr_rasb, Cas_n => ddr_casb, We_n => ddr_web,

      Dm => ddr_dm(7 downto 6));

  end generate;

  prom0 : sram16 generic map (index => 4, abits => romdepth, fname => promfile)

        port map (address(romdepth-1 downto 0), data,

                  gnd, gnd, romsn, writen, oen);

   iuerr : process

   begin

     wait for 5000 ns;

     if to_x01(errorn) = '1' then wait on errorn; end if;

     assert (to_x01(errorn) = '1')

       report "*** IU in error mode, simulation halted ***"

         severity failure ;

   end process;

  xdata <= "0000000000000000" & data;

  test0 :  grtestmod

    port map ( sys_rst_in, sys_clk, errorn, address(20 downto 1), xdata,

               iosn, oen, writen, open);

  data <= buskeep(data), (others => 'H') after 250 ns;

  ddr_dq <= buskeep(ddr_dq), (others => 'H') after 250 ns;

end ;