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/*

 * Copyright 2013, Homer Hsing <homer.hsing@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

 *     in      byte_num     out

 * 0x11223344      0    0x01000000

 * 0x11223344      1    0x11010000

 * 0x11223344      2    0x11220100

 * 0x11223344      3    0x11223301

 */

module padder1(in, byte_num, out);

    input      [31:0] in;

    input      [1:0]  byte_num;

    output reg [31:0] out;

    always @ (*)

      case (byte_num)

        0: out = 32'h1000000;

        1: out = {in[31:24], 24'h010000};

        2: out = {in[31:16], 16'h0100};

        3: out = {in[31:8],   8'h01};

      endcase

endmodule