Subversion Repositories 8051

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

////                                                              ////

//// multiply for 8051 Core                                       ////

////                                                              ////

//// This file is part of the 8051 cores project                  ////

//// http://www.opencores.org/cores/8051/                         ////

////                                                              ////

//// Description                                                  ////

//// Implementation of multipication used in alu.v                ////

////                                                              ////

//// To Do:                                                       ////

////  Nothing                                                     ////

////                                                              ////

//// Author(s):                                                   ////

//// - Simon Teran, simont@opencores.org                          ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2001 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                     ////

////                                                              ////

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

//

// ver: 1

//

// synopsys translate_off

`include "oc8051_timescale.v"

// synopsys translate_on

module oc8051_multiply (src1, src2, des1, des2, desOv);

//

// this module is part of alu

// src1         (in)  first operand

// src2         (in)  second operand

// des1         (out) first result

// des2         (out) second result

// desOv        (out) Overflow output

//

input [7:0] src1, src2;

output desOv;

output [7:0] des1, des2;

reg desOv; reg [7:0] des1, des2;

always @(src1 or src2)

begin

  {des2, des1} = src1* src2;

  if (des2!=8'b00000000)

    desOv = 1'b1;

  else

    desOv = 1'b0;

end

endmodule