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heshamelma |
//////////////////////////////////////////////////////////////////
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// //
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// Write back result select mux //
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// //
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// This file is part of the Edge project //
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// http://www.opencores.org/project,edge //
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// //
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// Description //
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// Multiplixer to choose from different result size //
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// //
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// Author(s): //
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// - Hesham AL-Matary, heshamelmatary@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2014 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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//////////////////////////////////////////////////////////////////
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`define loadWord 3'b000 /* LW (normal load word) */
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`define loadSByte 3'b001 /* LB (load signed byte) */
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`define loadSHWord 3'b010 /* LH (load signed half word) */
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`define loadUByte 3'b011 /* LBU (load unsigned byte) */
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`define loadUHWord 3'b100 /* LHU (load unsgined half word) */
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module mux_WBResult
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#
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(
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parameter N=32
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)
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(
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input[N-1:0] Word,
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input[N-1:0] SByte,
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input[N-1:0] SHWord,
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input[N-1:0] UByte,
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input[N-1:0] UHWord,
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input[2:0] s,
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output reg[N-1:0] WBResult
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);
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always @(*)
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case (s)
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`loadWord: WBResult = Word;
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`loadSByte: WBResult = SByte;
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`loadSHWord: WBResult = SHWord;
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`loadUByte: WBResult = UByte;
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`loadUHWord: WBResult = UHWord;
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default: WBResult = Word;
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endcase
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endmodule
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