Subversion Repositories pavr

-- <File header>

-- Project

--    pAVR (pipelined AVR) is an 8 bit RISC controller, compatible with Atmel's

--    AVR core, but about 3x faster in terms of both clock frequency and MIPS.

--    The increase in speed comes from a relatively deep pipeline. The original

--    AVR core has only two pipeline stages (fetch and execute), while pAVR has

--    6 pipeline stages:

--       1. PM    (read Program Memory)

--       2. INSTR (load Instruction)

--       3. RFRD  (decode Instruction and read Register File)

--       4. OPS   (load Operands)

--       5. ALU   (execute ALU opcode or access Unified Memory)

--       6. RFWR  (write Register File)

-- Version

--    0.32

-- Date

--    2002 August 07

-- Author

--    Doru Cuturela, doruu@yahoo.com

-- License

--    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.

--    You should have received a copy of the GNU General Public License

--    along with this program; if not, write to the Free Software

--    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-- </File header>

-- <File info>

-- Test the Data Memory.

-- A trivial read-write test.

-- </File info>

-- <File body>

library ieee;

use ieee.std_logic_1164.all;

library work;

use work.std_util.all;

use work.pavr_util.all;

use work.pavr_constants.all;

entity test_pavr_dm is

end;

architecture test_pavr_dm_arch of test_pavr_dm is

   signal clk, res: std_logic;

   -- Clock counter

   signal cnt: std_logic_vector(7 downto 0);

   -- DM connectivity

   signal pavr_dm_do    : std_logic_vector(7 downto 0);

   signal pavr_dm_wr    : std_logic;

   signal pavr_dm_addr  : std_logic_vector(pavr_dm_addr_w - 1 downto 0);

   signal pavr_dm_di    : std_logic_vector(7 downto 0);

   -- Declare the Data Memory

   component pavr_dm

   port(

      pavr_dm_clk:  in  std_logic;

      pavr_dm_wr:   in  std_logic;

      pavr_dm_addr: in  std_logic_vector(pavr_dm_addr_w - 1 downto 0);

      pavr_dm_di:   in  std_logic_vector(7 downto 0);

      pavr_dm_do:   out std_logic_vector(7 downto 0)

   );

   end component;

   for all: pavr_dm use entity work.pavr_dm(pavr_dm_arch);

begin

   -- Instantiate the Data Memory

   pavr_dm_instance1: pavr_dm

   port map(

      clk,

      pavr_dm_wr,

      pavr_dm_addr,

      pavr_dm_di,

      pavr_dm_do

   );

   generate_clock:

   process

   begin

      clk <= '1';

      wait for 50 ns;

      clk <= '0';

      wait for 50 ns;

   end process generate_clock;

   generate_reset:

   process

   begin

      res <= '0';

      wait for 100 ns;

      res <= '1';

      wait for 110 ns;

      res <= '0';

      wait for 1 ms;

   end process generate_reset;

   test_main:

   process(clk, res,

           cnt,

           pavr_dm_addr, pavr_dm_di

          )

   begin

      if res='1' then

         -- Async reset

         cnt <= int_to_std_logic_vector(0, cnt'length);

      elsif clk'event and clk='1' then

         -- Clock counter

         cnt <= cnt+1;

         -- Initialize inputs.

         pavr_dm_wr <= '0';

         pavr_dm_addr <= int_to_std_logic_vector(0, pavr_dm_addr'length);

         pavr_dm_di <= int_to_std_logic_vector(0, pavr_dm_di'length);

         case std_logic_vector_to_nat(cnt) is

            -- TEST 1. Write DM.

            when 3 =>

               pavr_dm_wr <= '1';

               pavr_dm_addr <= int_to_std_logic_vector(24, pavr_dm_addr'length);

               pavr_dm_di <= int_to_std_logic_vector(16#A9#, pavr_dm_di'length);

            -- TEST 2. Read DM.

            when 4 =>

               pavr_dm_wr <= '0';

               pavr_dm_addr <= int_to_std_logic_vector(24, pavr_dm_addr'length);

            when others =>

               null;

         end case;

      end if;

   end process test_main;

end;

-- </File body>