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[/] [apbtoaes128/] [trunk/] [rtl/] [data_swap.v] - Rev 3
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////////////////////////////////////////////////////////////////// //// //// //// AES CORE BLOCK //// //// //// //// This file is part of the APB to AES128 project //// //// http://www.opencores.org/cores/apbtoaes128/ //// //// //// //// Description //// //// Implementation of APB IP core according to //// //// aes128_spec IP core specification document. //// //// //// //// To Do: Things are right here but always all block can suffer changes //// //// //// //// //// //// Author(s): - Felipe Fernandes Da Costa, fefe2560@gmail.com //// Julio Cesar //// ///////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2009 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 //// //// /////////////////////////////////////////////////////////////////// module data_swap #( parameter WIDTH = 32 )( //OUTPUTS output [WIDTH - 1:0] data_swap, //INPUTS input [WIDTH - 1:0] data_in, input [ 1:0] swap_type ); //===================================================================================== // Swap Types //===================================================================================== localparam NO_SWAP = 2'b00; localparam HALF_WORD_SWAP = 2'b01; localparam BYTE_SWAP = 2'b10; localparam BIT_SWAP = 2'b11; localparam TYPES = 4; wire [WIDTH - 1 : 0] words[0 : TYPES - 1]; generate genvar i, j; for(i = 0; i < TYPES; i = i + 1) for(j = 0; j < WIDTH; j = j + 1) begin if(i != 3) assign words[i][j] = data_in[(WIDTH - (WIDTH/2**i)) - 2*(WIDTH/2**i)*(j/(WIDTH/2**i)) + j]; else assign words[i][j] = data_in[WIDTH - 1 - j]; end endgenerate assign data_swap = words[swap_type]; endmodule
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