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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Generic 32x32 multiplier                                    ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/cores/or1k/                        ////
////                                                              ////
////  Description                                                 ////
////  Generic 32x32 multiplier with pipeline stages.              ////
////                                                              ////
////  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 1.1.1.1  2001/10/06 10:18:36  igorm
// no message
//
// 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.
//
//
 
`include "timescale.v"
`include "defines.v"
 
// 32x32 multiplier, no input/output registers
// Registers inside Wallace trees every 8 full adder levels,
// with first pipeline after level 4
 
`define W 32
`define WW 64
 
module multp2_32x32 ( X, Y, CLK, RST, P );
 
input   [`W-1:0]  X;
input   [`W-1:0]  Y;
input           CLK;
input           RST;
output  [`WW-1:0]  P;
 
reg     [`WW-1:0]  p0;
reg     [`WW-1:0]  p1;
 
always @(posedge CLK or posedge RST)
        if (RST)
                p0 <= `WW'b0;
        else
                p0 <= #1 X * Y;
 
always @(posedge CLK or posedge RST)
        if (RST)
                p1 <= `WW'b0;
        else
                p1 <= #1 p0;
 
assign P = p1;
 
endmodule