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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's DC TAG RAMs                                        ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://opencores.org/project,or1k                           ////
////                                                              ////
////  Description                                                 ////
////  Instatiation of data cache tag rams.                        ////
////                                                              ////
////  To Do:                                                      ////
////   - make it smaller and faster                               ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source 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 Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// $Log: or1200_dc_tag.v,v $
// Revision 2.0  2010/06/30 11:00:00  ORSoC
// Minor update: 
// Coding style changed.
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
module or1200_dc_tag(
	// Clock and reset
	clk, rst,
 
`ifdef OR1200_BIST
	// RAM BIST
	mbist_si_i, mbist_so_o, mbist_ctrl_i,
`endif
 
	// Internal i/f
	addr, en, we, datain, tag_v, tag, dirty
);
 
parameter dw = `OR1200_DCTAG_W+1;
parameter aw = `OR1200_DCTAG;
 
//
// I/O
//
input				clk;
input				rst;
input	[aw-1:0]		addr;
input				en;
input				we;
input	[dw-1:0]		datain;
output				tag_v;
output	[dw-3:0]		tag;
output  			dirty;
 
 
`ifdef OR1200_BIST
//
// RAM BIST
//
input mbist_si_i;
input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;
output mbist_so_o;
`endif
 
`ifdef OR1200_NO_DC
 
//
// Data cache not implemented
//
assign tag = {dw-1{1'b0}};
assign tag_v = 1'b0;
`ifdef OR1200_BIST
assign mbist_so_o = mbist_si_i;
`endif
 
`else
 
//
// Instantiation of TAG RAM block
//
// Data widths are tag width plus one for valid
   or1200_spram #
     (
      .aw(`OR1200_DCTAG),
      .dw(`OR1200_DCTAG_W + 1)
      )
   dc_tag0
     (
`ifdef OR1200_BIST
      // RAM BIST
      .mbist_si_i(mbist_si_i),
      .mbist_so_o(mbist_so_o),
      .mbist_ctrl_i(mbist_ctrl_i),
`endif
      .clk(clk),
      .ce(en),
      .we(we),
      .addr(addr),
      .di(datain),
      .doq({tag, tag_v, dirty})
      );
`endif
 
endmodule // or1200_dc_tag