Subversion Repositories open8_urisc

-- Copyright (c)2006, Jeremy Seth Henry

-- All rights reserved.

--

-- Redistribution and use in source and binary forms, with or without

-- modification, are permitted provided that the following conditions are met:

--     * Redistributions of source code must retain the above copyright

--       notice, this list of conditions and the following disclaimer.

--     * Redistributions in binary form must reproduce the above copyright

--       notice, this list of conditions and the following disclaimer in the

--       documentation and/or other materials provided with the distribution,

--       where applicable (as part of a user interface, debugging port, etc.)

--

-- THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY

-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

-- DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY

-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

-- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-- VHDL Units :  Open8_pkg

-- Description:  Contains constant definitions for the Open8 processor

-- Revision History

-- Author          Date     Change

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

-- Seth Henry      07/22/06 Design Start

library ieee;

use ieee.std_logic_1164.all;

package Open8_pkg is

  -- These subtypes can be used with external peripherals to simplify

  --  connection to the core. 

  subtype ADDRESS_TYPE is std_logic_vector(15 downto 0);

  subtype DATA_TYPE    is std_logic_vector(7 downto 0);

  -- Note: INTERRUPT_BUNDLE must be exactly the same width as DATA_TYPE

  subtype INTERRUPT_BUNDLE is DATA_TYPE;

  -- Component declaration

  component Open8_CPU is

  generic(

    Stack_Start_Addr         : ADDRESS_TYPE;

    Allow_Stack_Address_Move : std_logic := '0';

    ISR_Start_Addr           : ADDRESS_TYPE;

    Program_Start_Addr       : ADDRESS_TYPE;

    Default_Interrupt_Mask   : DATA_TYPE;

    Enable_CPU_Halt          : std_logic := '0';

    Enable_Auto_Increment    : std_logic := '0' );

  port(

    Clock                    : in  std_logic;

    Reset                    : in  std_logic;

    CPU_Halt                 : in  std_logic;

    Interrupts               : in  INTERRUPT_BUNDLE;

    Address                  : out ADDRESS_TYPE;

    Rd_Data                  : in  DATA_TYPE;

    Rd_Enable                : out std_logic;

    Wr_Data                  : out DATA_TYPE;

    Wr_Enable                : out std_logic );

  end component;

end Open8_pkg;

package body Open8_pkg is

end package body;