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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.

 */

module padder1(in, byte_num, out);

    input      [63:0] in;

    input      [2:0]  byte_num;

    output reg [63:0] out;

    always @ (*)

      case (byte_num)

        0: out =             64'h0100000000000000;

        1: out = {in[63:56], 56'h01000000000000};

        2: out = {in[63:48], 48'h010000000000};

        3: out = {in[63:40], 40'h0100000000};

        4: out = {in[63:32], 32'h01000000};

        5: out = {in[63:24], 24'h010000};

        6: out = {in[63:16], 16'h0100};

        7: out = {in[63:8],   8'h01};

      endcase

endmodule