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1 19 dilbert57 
--===========================================================================--
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--
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-- MC6809 Microprocessor Test Bench 4
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-- Test Software - SBUG ROM
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--
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--
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-- John Kent 12st April 2003
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--
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-- Version 1.1 - 25th Jan 2004 - John Kent
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-- removed "test_alu" and "test_cc"
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--
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--
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-------------------------------------------------------------------------------
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library ieee;
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   use ieee.std_logic_1164.all;
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   use IEEE.STD_LOGIC_ARITH.ALL;
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   use ieee.numeric_std.all;
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entity my_testbench is
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end my_testbench;
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-------------------------------------------------------------------------------
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-- Architecture for memio Controller Unit
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-------------------------------------------------------------------------------
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architecture behavior of my_testbench is
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  -----------------------------------------------------------------------------
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  -- Signals
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  -----------------------------------------------------------------------------
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  signal cpu_irq    : std_Logic;
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  signal cpu_firq   : std_logic;
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  signal cpu_nmi    : std_logic;
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  -- CPU Interface signals
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  signal SysClk      : Std_Logic;
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  signal cpu_reset   : Std_Logic;
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  signal cpu_rw      : Std_Logic;
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  signal cpu_vma     : Std_Logic;
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  signal cpu_addr    : Std_Logic_Vector(15 downto 0);
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  signal cpu_data_in : Std_Logic_Vector(7 downto 0);
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  signal cpu_data_out: Std_Logic_Vector(7 downto 0);
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  signal cpu_halt    : Std_logic;
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  signal cpu_hold    : Std_logic;
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  signal rom_data_out: Std_Logic_Vector(7 downto 0);
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  signal ram_data_out: Std_Logic_Vector(7 downto 0);
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  signal ram_cs      : Std_Logic;
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component cpu09
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  port (
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         clk:        in std_logic;
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    rst:             in std_logic;
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    rw:      out        std_logic;              -- Asynchronous memory interface
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    vma:             out        std_logic;
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    address:  out       std_logic_vector(15 downto 0);
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    data_in:  in        std_logic_vector(7 downto 0);
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         data_out: out std_logic_vector(7 downto 0);
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         halt:     in  std_logic;
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         hold:     in  std_logic;
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         irq:      in  std_logic;
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         nmi:      in  std_logic;
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         firq:     in  std_logic
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  );
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end component;
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component sbug_rom
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    Port (
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       MEMclk   : in  std_logic;
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       MEMaddr  : in  std_logic_vector (10 downto 0);
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       MEMrdata : out std_logic_vector (7 downto 0)
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    );
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end component;
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component block_ram
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    Port (
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       MEMclk   : in  std_logic;
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       MEMcs    : in  std_logic;
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                 MEMrw    : in  std_logic;
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       MEMaddr  : in  std_logic_vector (10 downto 0);
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       MEMrdata : out std_logic_vector (7 downto 0);
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       MEMwdata : in  std_logic_vector (7 downto 0)
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    );
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end component;
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begin
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my_cpu : cpu09  port map (
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         clk         => SysClk,
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    rst      => cpu_reset,
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    rw       => cpu_rw,
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    vma       => cpu_vma,
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    address   => cpu_addr(15 downto 0),
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    data_in   => cpu_data_in,
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         data_out  => cpu_data_out,
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         halt      => cpu_halt,
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         hold      => cpu_hold,
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         irq       => cpu_irq,
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         nmi       => cpu_nmi,
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         firq      => cpu_firq
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  );
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my_ram : block_ram port map (
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       MEMclk   => SysClk,
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                 MEMcs    => ram_cs,
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                 MEMrw    => cpu_rw,
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       MEMaddr  => cpu_addr(10 downto 0),
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       MEMrdata => ram_data_out,
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       MEMwdata => cpu_data_out
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    );
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my_rom : sbug_rom port map (
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       MEMclk   => SysClk,
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       MEMaddr  => cpu_addr(10 downto 0),
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       MEMrdata => rom_data_out
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    );
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  -- *** Test Bench - User Defined Section ***
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   tb : PROCESS
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        variable count : integer;
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   BEGIN
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        cpu_reset <= '0';
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        SysClk <= '0';
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   cpu_irq <= '0';
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   cpu_nmi <= '0';
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        cpu_firq <= '0';
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   cpu_halt <= '0';
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        cpu_hold <= '0';
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                for count in 0 to 512 loop
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                        SysClk <= '0';
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                        if count = 0 then
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                                cpu_reset <= '1';
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                        elsif count = 1 then
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                                cpu_reset <= '0';
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                        end if;
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                        wait for 100 ns;
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                        SysClk <= '1';
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                        wait for 100 ns;
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                end loop;
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      wait; -- will wait forever
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   END PROCESS;
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-- *** End Test Bench - User Defined Section ***
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  rom : PROCESS( cpu_addr, rom_data_out, ram_data_out )
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  begin
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    if( cpu_addr(15 downto 11) = "11111" ) then
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      cpu_data_in <= rom_data_out;
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                ram_cs <= '0';
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         else
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      cpu_data_in <= ram_data_out;
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                ram_cs <= '1';
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         end if;
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  end process;
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end behavior; --===================== End of architecture =======================--
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