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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  OR1200's DC TAG RAMs                                        ////

////                                                              ////

////  This file is part of the OpenRISC 1200 project              ////

////  http://www.opencores.org/cores/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                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.2  2001/08/09 13:39:33  lampret

// Major clean-up.

//

// Revision 1.1  2001/07/20 00:46:03  lampret

// Development version of RTL. Libraries are missing.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "defines.v"

module dc_tag(

        // Clock and reset

        clk, rst,

        // Internal i/f

        addr, en, we, datain, tag_v, tag

);

parameter dw = 20;

parameter aw = 9;

//

// 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-2:0]         tag;

`ifdef OR1200_NO_DC

//

// Data cache not implemented

//

assign tag = {dw-1{1'b0}};

assign tag_v = 1'b0;

`else

//

// Instantiation of TAG RAM block

//

generic_spram_512x20 dc_tag0(

        .clk(clk),

        .rst(rst),

        .ce(en),

        .we(we),

        .oe(1'b1),

        .addr(addr),

        .di(datain),

        .do({tag_v, tag})

);

`endif

endmodule