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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_gmultp2_32x32.v] - Rev 481
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////////////////////////////////////////////////////////////////////// //// //// //// Generic 32x32 multiplier //// //// //// //// This file is part of the OpenRISC 1200 project //// //// http://www.opencores.org/project,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: or1200_gmultp2_32x32.v,v $ // Revision 2.0 2010/06/30 11:00:00 ORSoC // No update // // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "or1200_defines.v" // 32x32 multiplier, no input/output registers // Registers inside Wallace trees every 8 full adder levels, // with first pipeline after level 4 `ifdef OR1200_GENERIC_MULTP2_32X32 `define OR1200_W 32 `define OR1200_WW 64 module or1200_gmultp2_32x32 ( X, Y, CLK, RST, P ); input [`OR1200_W-1:0] X; input [`OR1200_W-1:0] Y; input CLK; input RST; output [`OR1200_WW-1:0] P; reg [`OR1200_WW-1:0] p0; reg [`OR1200_WW-1:0] p1; integer xi; integer yi; // // Conversion unsigned to signed // always @(X) xi = X; // // Conversion unsigned to signed // always @(Y) yi = Y; // // First multiply stage // always @(posedge CLK or `OR1200_RST_EVENT RST) if (RST == `OR1200_RST_VALUE) p0 <= `OR1200_WW'b0; else p0 <= xi * yi; // // Second multiply stage // always @(posedge CLK or `OR1200_RST_EVENT RST) if (RST == `OR1200_RST_VALUE) p1 <= `OR1200_WW'b0; else p1 <= p0; assign P = p1; endmodule `endif