embedded_kcpsm.vhd

描述：LED示范、按钮及开关、视频输出、键入、含Xilinx PicoBlaze微处理器的存储器模块

--
-- EMBEDDED_KCPSM.VHD
--
-- Ken Chapman - Xilinx Ltd - October 2002
--
-- This file instantiates the KCPSM processor macro and connects the 
-- program ROM.
--
-- NOTE: The name of the program ROM will probably need to be changed to 
--       reflect the name of the program (PSM) file applied to the assembler.
--
-- Modified by Balazs Attila-Mihaly to include support for multiple program ROMs
--    The index of the selected ROM is latched while reset is active
------------------------------------------------------------------------------------
--
-- Standard IEEE libraries
--
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
--
------------------------------------------------------------------------------------
--
--
entity embedded_kcpsm is
    Port (      port_id : out std_logic_vector(7 downto 0);
           write_strobe : out std_logic;
            read_strobe : out std_logic;
               out_port : out std_logic_vector(7 downto 0);
                in_port : in std_logic_vector(7 downto 0);
              interrupt : in std_logic;
                  reset : in std_logic;
                    clk : in std_logic;
					switches : in std_logic_vector(7 downto 0));
end embedded_kcpsm;
--
------------------------------------------------------------------------------------
--
-- Start of test achitecture
--
architecture connectivity of embedded_kcpsm is
--
------------------------------------------------------------------------------------
--
-- declaration of KCPSM
--
  component kcpsm
    Port (      address : out std_logic_vector(7 downto 0);
            instruction : in std_logic_vector(15 downto 0);
                port_id : out std_logic_vector(7 downto 0);
           write_strobe : out std_logic;
               out_port : out std_logic_vector(7 downto 0);
            read_strobe : out std_logic;
                in_port : in std_logic_vector(7 downto 0);
              interrupt : in std_logic;
                  reset : in std_logic;
                    clk : in std_logic);
    end component;
--
-- declaration of program ROM
--
	component AsyncROM_00 is
	    Port ( address : in std_logic_vector(7 downto 0);
	           instruction : out std_logic_vector(15 downto 0));
	end component;

	component AsyncROM_01 is
	    Port ( address : in std_logic_vector(7 downto 0);
	           instruction : out std_logic_vector(15 downto 0));
	end component;

	component AsyncROM_10 is
	    Port ( address : in std_logic_vector(7 downto 0);
	           instruction : out std_logic_vector(15 downto 0));
	end component;

	component AsyncROM_11 is
	    Port ( address : in std_logic_vector(7 downto 0);
	           instruction : out std_logic_vector(15 downto 0));
	end component;
--
------------------------------------------------------------------------------------
--
-- Signals used to connect KCPSM to program ROM
--
signal     address : std_logic_vector(7 downto 0);
signal instruction : std_logic_vector(15 downto 0);

signal switch_count : std_logic_vector(1 downto 0);
signal instruction_00, instruction_01, instruction_10, instruction_11 : std_logic_vector(15 downto 0);
--
------------------------------------------------------------------------------------
--
-- Start of test circuit description
--
begin

  processor: kcpsm
    port map(      address => address,
               instruction => instruction,
                   port_id => port_id,
              write_strobe => write_strobe,
                  out_port => out_port,
               read_strobe => read_strobe,
                   in_port => in_port,
                 interrupt => interrupt,
                     reset => reset,
                       clk => clk);

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

	-- The possible programs
	AS00 : AsyncROM_00 port map ( address, instruction_00 );
	AS01 : AsyncROM_01 port map ( address, instruction_01 );
	AS10 : AsyncROM_10 port map ( address, instruction_10 );
	AS11 : AsyncROM_11 port map ( address, instruction_11 );

	-- Latch to store which program will be used
	process (reset, switches)
	begin
		if (RESET = '1') then
			switch_count <= switches(1 downto 0);				
		end if;
	end process; 

	-- MUX
	with switch_count select
		instruction <= instruction_11 when "11",
			instruction_01 when "01",
			instruction_10 when "10",
			instruction_00 when others;		
end connectivity;

------------------------------------------------------------------------------------
--
-- END OF FILE EMBEDDED_KCPSM.VHD
--
------------------------------------------------------------------------------------