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--

--      Input file         : config_Pkg.vhd

--      Design name        : config_Pkg

--      Author             : Tamar Kranenburg

--      Company            : Delft University of Technology

--                         : Faculty EEMCS, Department ME&CE

--                         : Systems and Circuits group

--

--      Description        : Testbench which instantiates instruction memory, data memory,

--                           core, core address decoder and stdio

--

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library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

library mblite;

use mblite.config_Pkg.all;

use mblite.core_Pkg.all;

use mblite.std_Pkg.all;

entity testbench is

end testbench;

architecture arch of testbench is

    component mblite_stdio is port

    (

        dmem_i : out dmem_in_type;

        dmem_o : in dmem_out_type;

        clk_i  : in std_logic

    );

    end component;

    signal dmem_o : dmem_out_type;

    signal dmem_i : dmem_in_type;

    signal imem_o : imem_out_type;

    signal imem_i : imem_in_type;

    signal s_dmem_o : dmem_out_array_type(CFG_NUM_SLAVES - 1 downto 0);

    signal s_dmem_i : dmem_in_array_type(CFG_NUM_SLAVES - 1 downto 0);

    signal sys_clk_i : std_logic := '0';

    signal sys_int_i : std_logic;

    signal sys_rst_i : std_logic;

    constant rom_size : integer := 16;

    constant ram_size : integer := 16;

    signal sel_o : std_logic_vector(3 downto 0);

    signal ena_o : std_logic;

BEGIN

    sys_clk_i <= not sys_clk_i after 10000 ps;

    sys_rst_i <= '1' after 0 ps, '0' after  150000 ps;

    sys_int_i <= '1' after 500000000 ps, '0' after 500040000 ps;

    -- Warning: an infinite loop like while(1) {} triggers this timeout too!

    -- disable this feature when a premature finish occur.

    timeout: process(sys_clk_i)

    begin

        if NOW = 10 ms then

            report "TIMEOUT" severity FAILURE;

        end if;

        -- BREAK ON EXIT (0xB8000000)

        if compare(imem_i.dat_i, "10111000000000000000000000000000") = '1' then

            -- Make sure the simulator finishes when an error is encountered.

            -- For modelsim: see menu Simulate -> Runtime options -> Assertions

            report "FINISHED" severity FAILURE;

        end if;

    end process;

    stdio : mblite_stdio port map

    (

        dmem_i => s_dmem_i(1),

        dmem_o => s_dmem_o(1),

        clk_i  => sys_clk_i

    );

    s_dmem_i(0).ena_i <= '1';

    sel_o <= s_dmem_o(0).sel_o when s_dmem_o(0).we_o = '1' else (others => '0');

    ena_o <= not sys_rst_i and s_dmem_o(0).ena_o;

    dmem : sram_4en generic map

    (

        WIDTH => CFG_DMEM_WIDTH,

        SIZE => ram_size - 2

    )

    port map

    (

        dat_o => s_dmem_i(0).dat_i,

        dat_i => s_dmem_o(0).dat_o,

        adr_i => s_dmem_o(0).adr_o(ram_size - 1 downto 2),

        wre_i => sel_o,

        ena_i => ena_o,

        clk_i => sys_clk_i

    );

    decoder : core_address_decoder generic map

    (

        G_NUM_SLAVES => CFG_NUM_SLAVES

    )

    port map

    (

        m_dmem_i => dmem_i,

        s_dmem_o => s_dmem_o,

        m_dmem_o => dmem_o,

        s_dmem_i => s_dmem_i,

        clk_i    => sys_clk_i

    );

    imem : sram generic map

    (

        WIDTH => CFG_IMEM_WIDTH,

        SIZE => rom_size - 2

    )

    port map

    (

        dat_o => imem_i.dat_i,

        dat_i => "00000000000000000000000000000000",

        adr_i => imem_o.adr_o(rom_size - 1 downto 2),

        wre_i => '0',

        ena_i => imem_o.ena_o,

        clk_i => sys_clk_i

    );

    core0 : core port map

    (

        imem_o => imem_o,

        dmem_o => dmem_o,

        imem_i => imem_i,

        dmem_i => dmem_i,

        int_i  => sys_int_i,

        rst_i  => sys_rst_i,

        clk_i  => sys_clk_i

    );

end arch;