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+--------------------------------------------------------------------------
+--
+--  Copyright (C) 1993, Peter J. Ashenden
+--  Mail:	Dept. Computer Science
+--		University of Adelaide, SA 5005, Australia
+--  e-mail:	petera@cs.adelaide.edu.au
+--
+--  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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+--
+--------------------------------------------------------------------------
+--
+--  $RCSfile: dlx_test-bench_cache.vhdl,v $  $Revision: 2.1 $  $Date: 1993/11/02 22:14:11 $
+--
+--------------------------------------------------------------------------
+--
+--  Architecture for test bench for DLX and cache, including clock generator,
+--  memory and bus monitors for both CPU/cache and cache/memory buses.
+--
+
+
+use std.textio.all,
+    work.dlx_types.all,
+    work.mem_types.all;
+
+
+architecture bench_cache of dlx_test is
+
+  component clock_gen
+    port (phi1, phi2 : out bit;
+      	  reset : out bit);
+  end component;
+  
+  component memory
+    port (phi1, phi2 : in bit;
+      	  a : in dlx_address;
+	  d : inout dlx_word_bus bus;
+	  width : in mem_width;
+	  write_enable : in bit;
+          burst : in bit := '0';
+	  mem_enable : in bit;
+	  ready : out bit);
+  end component;
+  
+  component dlx
+    port (phi1, phi2 : in bit;		  -- 2-phase non-overlapping clocks
+          reset : in bit;		  -- synchronous reset input
+          a : out dlx_address;		  -- address bus output
+	  d : inout dlx_word_bus bus;	  -- bidirectional data bus
+	  halt : out bit;		  -- halt indicator
+	  width : out mem_width;	  -- byte/haldword/word indicator
+	  write_enable : out bit;	  -- selects read or write cycle
+	  mem_enable : out bit;		  -- starts memory cycle
+	  ifetch : out bit;		  -- indicates instruction fetch
+	  ready : in bit);		  -- status from memory system
+  end component;
+
+  component cache
+    port (phi1, phi2 : in bit;		  -- 2-phase non-overlapping clocks
+      	  reset : in bit;		  -- synchronous reset input
+          --  connections to CPU
+	  cpu_enable : in bit;		  -- starts memory cycle
+	  cpu_width : in mem_width;	  -- byte/halfword/word indicator
+	  cpu_write : in bit;		  -- selects read or write cycle
+	  cpu_ready : out bit;		  -- status from memory system
+      	  cpu_a : in dlx_address;		  -- address bus output
+	  cpu_d : inout dlx_word_bus bus;	  -- bidirectional data bus
+          --  connections to memory
+	  mem_enable : out bit;		  -- starts memory cycle
+	  mem_width : out mem_width;	  -- byte/halfword/word indicator
+	  mem_write : out bit;		  -- selects read or write cycle
+          mem_burst : out bit;              --  tell memory to burst txfer
+	  mem_ready : in bit;		  -- status from memory system
+      	  mem_a : out dlx_address;	  -- address bus output
+	  mem_d : inout dlx_word_bus bus);  -- bidirectional data bus
+  end component;
+
+  component dlx_bus_monitor
+    port (phi1, phi2 : in bit;		  -- 2-phase non-overlapping clocks
+      	  reset : in bit;		  -- synchronous reset
+      	  a : in dlx_address;		  -- address bus
+	  d : in dlx_word;	  	  -- data bus
+	  halt : in bit;		  -- halt indicator
+	  width : in mem_width;		  -- byte/haldword/word indicator
+	  write_enable : in bit;	  -- selects read or write cycle
+          burst : in bit := '0';          -- indicates more to come in burst
+	  mem_enable : in bit;		  -- starts memory cycle
+	  ifetch : in bit;		  -- indicates instruction fetch
+	  ready : in bit);		  -- status from memory system
+  end component;
+
+  signal phi1, phi2, reset : bit;
+  signal cpu_a, mem_a : dlx_address;
+  signal cpu_d, mem_d : dlx_word_bus bus;
+  signal halt : bit;
+  signal cpu_width, mem_width : mem_width;
+  signal cpu_enable, mem_enable,
+         cpu_write, mem_write,
+         cpu_ready, mem_ready,
+         mem_burst, ifetch : bit;
+  
+begin
+
+  cg : clock_gen
+    port map (phi1, phi2, reset);
+    
+  mem : memory
+    port map (phi1, phi2, mem_a, mem_d,
+              mem_width, mem_write, mem_burst, mem_enable, mem_ready);
+    
+  proc : dlx
+    port map (phi1, phi2, reset, cpu_a, cpu_d, 
+      	      halt, cpu_width, cpu_write, cpu_enable, ifetch, cpu_ready);
+
+  the_cache : cache
+    port map (phi1, phi2, reset,
+              cpu_enable, cpu_width, cpu_write, cpu_ready, cpu_a, cpu_d,
+              mem_enable, mem_width, mem_write, mem_burst, mem_ready, mem_a, mem_d);
+
+  cpu_cache_monitor : dlx_bus_monitor
+    port map (phi1, phi2, reset, cpu_a, cpu_d, 
+      	      halt, cpu_width, cpu_write, open, cpu_enable, ifetch, cpu_ready);
+
+  cache_mem_monitor : dlx_bus_monitor
+    port map (phi1, phi2, reset, mem_a, mem_d, 
+      	      halt, mem_width, mem_write, mem_burst, mem_enable, ifetch, mem_ready);
+
+end bench_cache;