cache.vhd

一个航天航空用的Sparc处理器（配美国欧洲宇航局用的R_tems嵌入式操作系统）的VHDL源代码

-----------------------------------------------------------------------------
--  This file is a part of the LEON VHDL model
--  Copyright (C) 1999  European Space Agency (ESA)
--
--  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.
--
--  See the file COPYING for the full details of the license.
-----------------------------------------------------------------------------
-- Entity: 	cache
-- File:	cache.vhd
-- Author:	Jiri Gaisler - ESA/ESTEC
-- Description:	Complete cache sub-system with controllers and rams
------------------------------------------------------------------------------
-- Version control:
-- 17-02-1999:	First implemetation
-- 26-09-1999:	Release 1.0
------------------------------------------------------------------------------

library IEEE;
use IEEE.std_logic_1164.all;
use work.config.all;
use work.iface.all;

entity cache is
  port (
    rst   : in  std_logic;
    clk   : in  std_logic;
    ici   : in  icache_in_type;
    ico   : out icache_out_type;
    dci   : in  dcache_in_type;
    dco   : out dcache_out_type;
    mcii : out memory_ic_in_type;
    mcio : in  memory_ic_out_type;
    mcdi : out memory_dc_in_type;
    mcdo : in  memory_dc_out_type
  );
end; 

architecture rtl of cache is

component dcache
  port (
     Rst : in  std_logic;
     Clk : in  std_logic;
     dci : in  dcache_in_type;
     dco : out dcache_out_type;
     ico : in  icache_out_type;
    mcdi : out memory_dc_in_type;
    mcdo : in  memory_dc_out_type;
    dcrami : out dcram_in_type;
    dcramo : in  dcram_out_type
);
end component; 

component icache
  port (
   rst : in  std_logic;
   clk : in  std_logic;
     ici : in  icache_in_type;
     ico : out icache_out_type;
     dci : in  dcache_in_type;
     dco : in  dcache_out_type;
    mcii : out memory_ic_in_type;
    mcio : in  memory_ic_out_type;
    icrami : out icram_in_type;
    icramo : in  icram_out_type
);
end component; 

component cachemem 
  port (
    	clk   : in  std_logic;
	crami : in  cram_in_type;
	cramo : out cram_out_type
  );
end component;

signal icol : icache_out_type;
signal dcol : dcache_out_type;
signal crami : cram_in_type;
signal cramo : cram_out_type;
 
begin

-- instruction cache controller

  icache0 : icache port map (
	rst, clk, ici, icol, dci, dcol, mcii, mcio, 
   	crami.icramin, cramo.icramout
  );

-- data cache controller

  dcache0 : dcache port map (
	rst, clk, dci, dcol, 
	icol, mcdi, mcdo, crami.dcramin, cramo.dcramout
  );

-- tag and data rams

  cachemem0 : cachemem port map (clk, crami, cramo);

  ico <= icol;
  dco <= dcol;

end ;