// ========== Copyright Header Begin ========================================== // // OpenSPARC T2 Processor File: dffre.v // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved // 4150 Network Circle, Santa Clara, California 95054, U.S.A. // // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; version 2 of the License. // // This program 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 General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // // For the avoidance of doubt, and except that if any non-GPL license // choice is available it will apply instead, Sun elects to use only // the General Public License version 2 (GPLv2) at this time for any // software where a choice of GPL license versions is made // available with the language indicating that GPLv2 or any later version // may be used, or where a choice of which version of the GPL is applied is // otherwise unspecified. // // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, // CA 95054 USA or visit www.sun.com if you need additional information or // have any questions. // // ========== Copyright Header End ============================================ /*%W% %G%*/ /***************************************************************** * * File Name : dffre.v * Author Name : John Lo * Description : * * Parent Module: * Child Module: * Interface Mod: many. * Date Created : 3/25/04 * * Copyright (c) 2020, Sun Microsystems, Inc. * Sun Proprietary and Confidential * * Modification : * ****************************************************************/ module dffre (clk,reset,en,d,q); parameter WIDTH = 1; input [WIDTH-1:0] d; input reset; input en; input clk; output [WIDTH-1:0] q; reg [WIDTH-1:0] q; always@(posedge clk ) begin if (reset) q[WIDTH-1:0] <= {WIDTH{1'b0}} ; else if (en) q[WIDTH-1:0] <= d[WIDTH-1:0] ; else q[WIDTH-1:0] <= q[WIDTH-1:0] ; end endmodule