path: root/src/tb/tb_aes_key_mem.v

//======================================================================
//
// tb_aes_key_mem.v
// ----------------
// Testbench for the AES key memory module.
//
//
// Author: Joachim Strombergson
// Copyright (c) 2014, SUNET
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the following
// conditions are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in
//    the documentation and/or other materials provided with the
//    distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//======================================================================

//------------------------------------------------------------------
// Test module.
//------------------------------------------------------------------
module tb_aes_key_mem();

  //----------------------------------------------------------------
  // Internal constant and parameter definitions.
  //----------------------------------------------------------------
  parameter DEBUG = 1;
  parameter SHOW_SBOX = 0;

  parameter CLK_HALF_PERIOD = 1;
  parameter CLK_PERIOD = 2 * CLK_HALF_PERIOD;

  parameter AES_128_BIT_KEY = 0;
  parameter AES_256_BIT_KEY = 1;

  parameter AES_128_NUM_ROUNDS = 10;
  parameter AES_192_NUM_ROUNDS = 12;
  parameter AES_256_NUM_ROUNDS = 14;

  parameter AES_DECIPHER = 1'b0;
  parameter AES_ENCIPHER = 1'b1;


  //----------------------------------------------------------------
  // Register and Wire declarations.
  //----------------------------------------------------------------
  reg [31 : 0] cycle_ctr;
  reg [31 : 0] error_ctr;
  reg [31 : 0] tc_ctr;

  reg            tb_clk;
  reg            tb_reset_n;
  reg [255 : 0]  tb_key;
  reg            tb_keylen;
  reg            tb_init;
  reg [3 : 0]    tb_round;
  wire [127 : 0] tb_round_key;
  wire           tb_ready;

  wire [31 : 0]  tb_sboxw;
  wire [31 : 0]  tb_new_sboxw;


  //----------------------------------------------------------------
  // Device Under Test.
  //----------------------------------------------------------------
  aes_key_mem dut(
                  .clk(tb_clk),
                  .reset_n(tb_reset_n),

                  .key(tb_key),
                  .keylen(tb_keylen),
                  .init(tb_init),

                  .round(tb_round),
                  .round_key(tb_round_key),
                  .ready(tb_ready),

                  .sboxw(tb_sboxw),
                  .new_sboxw(tb_new_sboxw)
                 );

  // The DUT requirees Sboxes.
  aes_sbox sbox(.sboxw(tb_sboxw), .new_sboxw(tb_new_sboxw));


  //----------------------------------------------------------------
  // clk_gen
  //
  // Always running clock generator process.
  //----------------------------------------------------------------
  always
    begin : clk_gen
      #CLK_HALF_PERIOD;
      tb_clk = !tb_clk;
    end // clk_gen


  //----------------------------------------------------------------
  // sys_monitor()
  //
  // An always running process that creates a cycle counter and
  // conditionally displays information about the DUT.
  //----------------------------------------------------------------
  always
    begin : sys_monitor
      cycle_ctr = cycle_ctr + 1;
      #(CLK_PERIOD);
      if (DEBUG)
        begin
          dump_dut_state();
        end
    end


  //----------------------------------------------------------------
  // dump_dut_state()
  //
  // Dump the state of the dump when needed.
  //----------------------------------------------------------------
  task dump_dut_state;
    begin
      $display("State of DUT");
      $display("------------");
      $display("Inputs and outputs:");
      $display("key       = 0x%032x", dut.key);
      $display("keylen    = 0x%01x, init = 0x%01x, ready = 0x%01x",
               dut.keylen, dut.init, dut.ready);
      $display("round     = 0x%02x", dut.round);
      $display("round_key = 0x%016x", dut.round_key);
      $display("");

      $display("Internal states:");
      $display("key_mem_ctrl = 0x%01x, round_key_update = 0x%01x, round_ctr_reg = 0x%01x, rcon_reg = 0x%01x",
               dut.key_mem_ctrl_reg, dut.round_key_update, dut.round_ctr_reg, dut.rcon_reg);

      $display("prev_key0_reg = 0x%016x, prev_key0_new = 0x%016x, prev_key0_we = 0x%01x",
               dut.prev_key0_reg, dut.prev_key0_new, dut.prev_key0_we);
      $display("prev_key1_reg = 0x%016x, prev_key1_new = 0x%016x, prev_key1_we = 0x%01x",
               dut.prev_key1_reg, dut.prev_key1_new, dut.prev_key1_we);

      $display("w0 = 0x%04x, w1 = 0x%04x, w2 = 0x%04x, w3 = 0x%04x",
               dut.round_key_gen.w0, dut.round_key_gen.w1,
               dut.round_key_gen.w2, dut.round_key_gen.w3);
      $display("w4 = 0x%04x, w5 = 0x%04x, w6 = 0x%04x, w7 = 0x%04x",
               dut.round_key_gen.w4, dut.round_key_gen.w5,
               dut.round_key_gen.w6, dut.round_key_gen.w7);
      $display("sboxw = 0x%04x, new_sboxw = 0x%04x, rconw = 0x%04x",
               dut.sboxw, dut.new_sboxw, dut.round_key_gen.rconw);
      $display("tw = 0x%04x, trw = 0x%04x", dut.round_key_gen.tw, dut.round_key_gen.trw);
      $display("key_mem_new = 0x%016x, key_mem_we = 0x%01x",
               dut.key_mem_new, dut.key_mem_we);
      $display("");

      if (SHOW_SBOX)
        begin
          $display("Sbox functionality:");
          $display("sboxw = 0x%08x", sbox.sboxw);
          $display("tmp_new_sbox0 = 0x%02x, tmp_new_sbox1 = 0x%02x, tmp_new_sbox2 = 0x%02x, tmp_new_sbox3",
                   sbox.tmp_new_sbox0, sbox.tmp_new_sbox1, sbox.tmp_new_sbox2, sbox.tmp_new_sbox3);
          $display("new_sboxw = 0x%08x", sbox.new_sboxw);
          $display("");
        end
    end
  endtask // dump_dut_state


  //----------------------------------------------------------------
  // reset_dut()
  //
  // Toggle reset to put the DUT into a well known state.
  //----------------------------------------------------------------
  task reset_dut;
    begin
      $display("*** Toggle reset.");
      tb_reset_n = 0;
      #(2 * CLK_PERIOD);
      tb_reset_n = 1;
    end
  endtask // reset_dut


  //----------------------------------------------------------------
  // init_sim()
  //
  // Initialize all counters and testbed functionality as well
  // as setting the DUT inputs to defined values.
  //----------------------------------------------------------------
  task init_sim;
    begin
      cycle_ctr = 0;
      error_ctr = 0;
      tc_ctr    = 0;

      tb_clk     = 0;
      tb_reset_n = 1;
      tb_key     = {8{32'h00000000}};
      tb_keylen  = 0;
      tb_init    = 0;
      tb_round   = 4'h0;
    end
  endtask // init_sim


  //----------------------------------------------------------------
  // wait_ready()
  //
  // Wait for the ready flag in the dut to be set.
  //
  // Note: It is the callers responsibility to call the function
  // when the dut is actively processing and will in fact at some
  // point set the flag.
  //----------------------------------------------------------------
  task wait_ready;
    begin
      while (!tb_ready)
        begin
          #(CLK_PERIOD);
        end
    end
  endtask // wait_ready


  //----------------------------------------------------------------
  // check_key()
  //
  // Check a given key in the dut key memory against a given
  // expected key.
  //----------------------------------------------------------------
  task check_key(input [3 : 0] key_nr, input [127 : 0] expected);
    begin
      tb_round = key_nr;
      #(CLK_PERIOD);
      if (tb_round_key == expected)
        begin
          $display("** key 0x%01x matched expected round key.", key_nr);
          $display("** Got:      0x%016x **", tb_round_key);
        end
      else
        begin
          $display("** Error: key 0x%01x did not match expected round key. **", key_nr);
          $display("** Expected: 0x%016x **", expected);
          $display("** Got:      0x%016x **", tb_round_key);
          error_ctr = error_ctr + 1;
        end
      $display("");
    end
  endtask // check_key


  //----------------------------------------------------------------
  // test_key_128()
  //
  // Test 128 bit keys. Due to array problems, the result check
  // is fairly ugly.
  //----------------------------------------------------------------
  task test_key_128(input [255 : 0] key,
                    input [127 : 0] expected00,
                    input [127 : 0] expected01,
                    input [127 : 0] expected02,
                    input [127 : 0] expected03,
                    input [127 : 0] expected04,
                    input [127 : 0] expected05,
                    input [127 : 0] expected06,
                    input [127 : 0] expected07,
                    input [127 : 0] expected08,
                    input [127 : 0] expected09,
                    input [127 : 0] expected10
                   );
    begin
      $display("** Testing with 128-bit key 0x%16x", key[255 : 128]);
      $display("");

      tb_key = key;
      tb_keylen = AES_128_BIT_KEY;
      tb_init = 1;
      #(2 * CLK_PERIOD);
      tb_init = 0;
      wait_ready();

      check_key(4'h0, expected00);
      check_key(4'h1, expected01);
      check_key(4'h2, expected02);
      check_key(4'h3, expected03);
      check_key(4'h4, expected04);
      check_key(4'h5, expected05);
      check_key(4'h6, expected06);
      check_key(4'h7, expected07);
      check_key(4'h8, expected08);
      check_key(4'h9, expected09);
      check_key(4'ha, expected10);

      tc_ctr = tc_ctr + 1;
    end
  endtask // test_key_128


  //----------------------------------------------------------------
  // test_key_256()
  //
  // Test 256 bit keys. Due to array problems, the result check
  // is fairly ugly.
  //----------------------------------------------------------------
  task test_key_256(input [255 : 0] key,
                    input [127 : 0] expected00,
                    input [127 : 0] expected01,
                    input [127 : 0] expected02,
                    input [127 : 0] expected03,
                    input [127 : 0] expected04,
                    input [127 : 0] expected05,
                    input [127 : 0] expected06,
                    input [127 : 0] expected07,
                    input [127 : 0] expected08,
                    input [127 : 0] expected09,
                    input [127 : 0] expected10,
                    input [127 : 0] expected11,
                    input [127 : 0] expected12,
                    input [127 : 0] expected13,
                    input [127 : 0] expected14
                   );
    begin
      $display("** Testing with 256-bit key 0x%32x", key[255 : 000]);
      $display("");

      tb_key = key;
      tb_keylen = AES_256_BIT_KEY;
      tb_init = 1;
      #(2 * CLK_PERIOD);
      tb_init = 0;

      wait_ready();

      check_key(4'h0, expected00);
      check_key(4'h1, expected01);
      check_key(4'h2, expected02);
      check_key(4'h3, expected03);
      check_key(4'h4, expected04);
      check_key(4'h5, expected05);
      check_key(4'h6, expected06);
      check_key(4'h7, expected07);
      check_key(4'h8, expected08);
      check_key(4'h9, expected09);
      check_key(4'ha, expected10);
      check_key(4'hb, expected11);
      check_key(4'hc, expected12);
      check_key(4'hd, expected13);
      check_key(4'he, expected14);

      tc_ctr = tc_ctr + 1;
    end
  endtask // test_key_256


  //----------------------------------------------------------------
  // display_test_result()
  //
  // Display the accumulated test results.
  //----------------------------------------------------------------
  task display_test_result;
    begin
      if (error_ctr == 0)
        begin
          $display("*** All %02d test cases completed successfully", tc_ctr);
        end
      else
        begin
          $display("*** %02d tests completed - %02d test cases did not complete successfully.",
                   tc_ctr, error_ctr);
        end
    end
  endtask // display_test_result


  //----------------------------------------------------------------
  // aes_key_mem_test
  // The main test functionality.
  //----------------------------------------------------------------
  initial
    begin : aes_key_mem_test
      reg [255 : 0] key128_0;
      reg [255 : 0] key128_1;
      reg [255 : 0] key128_2;
      reg [255 : 0] key128_3;
      reg [255 : 0] nist_key128;
      reg [255 : 0] key256_0;
      reg [255 : 0] key256_1;
      reg [255 : 0] key256_2;
      reg [255 : 0] nist_key256;

      reg [127 : 0] expected_00;
      reg [127 : 0] expected_01;
      reg [127 : 0] expected_02;
      reg [127 : 0] expected_03;
      reg [127 : 0] expected_04;
      reg [127 : 0] expected_05;
      reg [127 : 0] expected_06;
      reg [127 : 0] expected_07;
      reg [127 : 0] expected_08;
      reg [127 : 0] expected_09;
      reg [127 : 0] expected_10;
      reg [127 : 0] expected_11;
      reg [127 : 0] expected_12;
      reg [127 : 0] expected_13;
      reg [127 : 0] expected_14;

      $display("   -= Testbench for aes key mem started =-");
      $display("    =====================================");
      $display("");

      init_sim();
      dump_dut_state();
      reset_dut();

      $display("State after reset:");
      dump_dut_state();
      $display("");

      #(100 *CLK_PERIOD);

      // AES-128 test case 1 key and expected values.
      key128_0    = 256'h0000000000000000000000000000000000000000000000000000000000000000;
      expected_00 = 128'h00000000000000000000000000000000;
      expected_01 = 128'h62636363626363636263636362636363;
      expected_02 = 128'h9b9898c9f9fbfbaa9b9898c9f9fbfbaa;
      expected_03 = 128'h90973450696ccffaf2f457330b0fac99;
      expected_04 = 128'hee06da7b876a1581759e42b27e91ee2b;
      expected_05 = 128'h7f2e2b88f8443e098dda7cbbf34b9290;
      expected_06 = 128'hec614b851425758c99ff09376ab49ba7;
      expected_07 = 128'h217517873550620bacaf6b3cc61bf09b;
      expected_08 = 128'h0ef903333ba9613897060a04511dfa9f;
      expected_09 = 128'hb1d4d8e28a7db9da1d7bb3de4c664941;
      expected_10 = 128'hb4ef5bcb3e92e21123e951cf6f8f188e;

      test_key_128(key128_0,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10);


      // AES-128 test case 2 key and expected values.
      key128_1    = 256'hffffffffffffffffffffffffffffffff00000000000000000000000000000000;
      expected_00 = 128'hffffffffffffffffffffffffffffffff;
      expected_01 = 128'he8e9e9e917161616e8e9e9e917161616;
      expected_02 = 128'hadaeae19bab8b80f525151e6454747f0;
      expected_03 = 128'h090e2277b3b69a78e1e7cb9ea4a08c6e;
      expected_04 = 128'he16abd3e52dc2746b33becd8179b60b6;
      expected_05 = 128'he5baf3ceb766d488045d385013c658e6;
      expected_06 = 128'h71d07db3c6b6a93bc2eb916bd12dc98d;
      expected_07 = 128'he90d208d2fbb89b6ed5018dd3c7dd150;
      expected_08 = 128'h96337366b988fad054d8e20d68a5335d;
      expected_09 = 128'h8bf03f233278c5f366a027fe0e0514a3;
      expected_10 = 128'hd60a3588e472f07b82d2d7858cd7c326;

      test_key_128(key128_1,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10);


      // AES-128 test case 3 key and expected values.
      key128_2    = 256'h000102030405060708090a0b0c0d0e0f00000000000000000000000000000000;
      expected_00 = 128'h000102030405060708090a0b0c0d0e0f;
      expected_01 = 128'hd6aa74fdd2af72fadaa678f1d6ab76fe;
      expected_02 = 128'hb692cf0b643dbdf1be9bc5006830b3fe;
      expected_03 = 128'hb6ff744ed2c2c9bf6c590cbf0469bf41;
      expected_04 = 128'h47f7f7bc95353e03f96c32bcfd058dfd;
      expected_05 = 128'h3caaa3e8a99f9deb50f3af57adf622aa;
      expected_06 = 128'h5e390f7df7a69296a7553dc10aa31f6b;
      expected_07 = 128'h14f9701ae35fe28c440adf4d4ea9c026;
      expected_08 = 128'h47438735a41c65b9e016baf4aebf7ad2;
      expected_09 = 128'h549932d1f08557681093ed9cbe2c974e;
      expected_10 = 128'h13111d7fe3944a17f307a78b4d2b30c5;

      test_key_128(key128_2,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10);


      // AES-128 test case 4 key and expected values.
      key128_3    = 256'h6920e299a5202a6d656e636869746f2a00000000000000000000000000000000;
      expected_00 = 128'h6920e299a5202a6d656e636869746f2a;
      expected_01 = 128'hfa8807605fa82d0d3ac64e6553b2214f;
      expected_02 = 128'hcf75838d90ddae80aa1be0e5f9a9c1aa;
      expected_03 = 128'h180d2f1488d0819422cb6171db62a0db;
      expected_04 = 128'hbaed96ad323d173910f67648cb94d693;
      expected_05 = 128'h881b4ab2ba265d8baad02bc36144fd50;
      expected_06 = 128'hb34f195d096944d6a3b96f15c2fd9245;
      expected_07 = 128'ha7007778ae6933ae0dd05cbbcf2dcefe;
      expected_08 = 128'hff8bccf251e2ff5c5c32a3e7931f6d19;
      expected_09 = 128'h24b7182e7555e77229674495ba78298c;
      expected_10 = 128'hae127cdadb479ba8f220df3d4858f6b1;

      test_key_128(key128_3,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10);


      // NIST AES-128 test case.
      nist_key128 = 256'h2b7e151628aed2a6abf7158809cf4f3c00000000000000000000000000000000;
      expected_00 = 128'h2b7e151628aed2a6abf7158809cf4f3c;
      expected_01 = 128'ha0fafe1788542cb123a339392a6c7605;
      expected_02 = 128'hf2c295f27a96b9435935807a7359f67f;
      expected_03 = 128'h3d80477d4716fe3e1e237e446d7a883b;
      expected_04 = 128'hef44a541a8525b7fb671253bdb0bad00;
      expected_05 = 128'hd4d1c6f87c839d87caf2b8bc11f915bc;
      expected_06 = 128'h6d88a37a110b3efddbf98641ca0093fd;
      expected_07 = 128'h4e54f70e5f5fc9f384a64fb24ea6dc4f;
      expected_08 = 128'head27321b58dbad2312bf5607f8d292f;
      expected_09 = 128'hac7766f319fadc2128d12941575c006e;
      expected_10 = 128'hd014f9a8c9ee2589e13f0cc8b6630ca6;

      $display("Testing the NIST AES-128 key.");
      test_key_128(nist_key128,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10);


      // AES-256 test case 1 key and expected values.
      key256_0    = 256'h000000000000000000000000000000000000000000000000000000000000000;
      expected_00 = 128'h00000000000000000000000000000000;
      expected_01 = 128'h00000000000000000000000000000000;
      expected_02 = 128'h62636363626363636263636362636363;
      expected_03 = 128'haafbfbfbaafbfbfbaafbfbfbaafbfbfb;
      expected_04 = 128'h6f6c6ccf0d0f0fac6f6c6ccf0d0f0fac;
      expected_05 = 128'h7d8d8d6ad77676917d8d8d6ad7767691;
      expected_06 = 128'h5354edc15e5be26d31378ea23c38810e;
      expected_07 = 128'h968a81c141fcf7503c717a3aeb070cab;
      expected_08 = 128'h9eaa8f28c0f16d45f1c6e3e7cdfe62e9;
      expected_09 = 128'h2b312bdf6acddc8f56bca6b5bdbbaa1e;
      expected_10 = 128'h6406fd52a4f79017553173f098cf1119;
      expected_11 = 128'h6dbba90b0776758451cad331ec71792f;
      expected_12 = 128'he7b0e89c4347788b16760b7b8eb91a62;
      expected_13 = 128'h74ed0ba1739b7e252251ad14ce20d43b;
      expected_14 = 128'h10f80a1753bf729c45c979e7cb706385;

      test_key_256(key256_0,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10, expected_11,
                   expected_12, expected_13, expected_14);


      // AES-256 test case 2 key and expected values.
      key256_1    = 256'hffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
      expected_00 = 128'hffffffffffffffffffffffffffffffff;
      expected_01 = 128'hffffffffffffffffffffffffffffffff;
      expected_02 = 128'he8e9e9e917161616e8e9e9e917161616;
      expected_03 = 128'h0fb8b8b8f04747470fb8b8b8f0474747;
      expected_04 = 128'h4a4949655d5f5f73b5b6b69aa2a0a08c;
      expected_05 = 128'h355858dcc51f1f9bcaa7a7233ae0e064;
      expected_06 = 128'hafa80ae5f2f755964741e30ce5e14380;
      expected_07 = 128'heca0421129bf5d8ae318faa9d9f81acd;
      expected_08 = 128'he60ab7d014fde24653bc014ab65d42ca;
      expected_09 = 128'ha2ec6e658b5333ef684bc946b1b3d38b;
      expected_10 = 128'h9b6c8a188f91685edc2d69146a702bde;
      expected_11 = 128'ha0bd9f782beeac9743a565d1f216b65a;
      expected_12 = 128'hfc22349173b35ccfaf9e35dbc5ee1e05;
      expected_13 = 128'h0695ed132d7b41846ede24559cc8920f;
      expected_14 = 128'h546d424f27de1e8088402b5b4dae355e;

      test_key_256(key256_1,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10, expected_11,
                   expected_12, expected_13, expected_14);


      // AES-256 test case 3 key and expected values.
      key256_2    = 256'h000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f;
      expected_00 = 128'h000102030405060708090a0b0c0d0e0f;
      expected_01 = 128'h101112131415161718191a1b1c1d1e1f;
      expected_02 = 128'ha573c29fa176c498a97fce93a572c09c;
      expected_03 = 128'h1651a8cd0244beda1a5da4c10640bade;
      expected_04 = 128'hae87dff00ff11b68a68ed5fb03fc1567;
      expected_05 = 128'h6de1f1486fa54f9275f8eb5373b8518d;
      expected_06 = 128'hc656827fc9a799176f294cec6cd5598b;
      expected_07 = 128'h3de23a75524775e727bf9eb45407cf39;
      expected_08 = 128'h0bdc905fc27b0948ad5245a4c1871c2f;
      expected_09 = 128'h45f5a66017b2d387300d4d33640a820a;
      expected_10 = 128'h7ccff71cbeb4fe5413e6bbf0d261a7df;
      expected_11 = 128'hf01afafee7a82979d7a5644ab3afe640;
      expected_12 = 128'h2541fe719bf500258813bbd55a721c0a;
      expected_13 = 128'h4e5a6699a9f24fe07e572baacdf8cdea;
      expected_14 = 128'h24fc79ccbf0979e9371ac23c6d68de36;

      test_key_256(key256_2,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10, expected_11,
                   expected_12, expected_13, expected_14);


      nist_key256 = 256'h603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4;
      expected_00 = 128'h603deb1015ca71be2b73aef0857d7781;
      expected_01 = 128'h1f352c073b6108d72d9810a30914dff4;
      expected_02 = 128'h9ba354118e6925afa51a8b5f2067fcde;
      expected_03 = 128'ha8b09c1a93d194cdbe49846eb75d5b9a;
      expected_04 = 128'hd59aecb85bf3c917fee94248de8ebe96;
      expected_05 = 128'hb5a9328a2678a647983122292f6c79b3;
      expected_06 = 128'h812c81addadf48ba24360af2fab8b464;
      expected_07 = 128'h98c5bfc9bebd198e268c3ba709e04214;
      expected_08 = 128'h68007bacb2df331696e939e46c518d80;
      expected_09 = 128'hc814e20476a9fb8a5025c02d59c58239;
      expected_10 = 128'hde1369676ccc5a71fa2563959674ee15;
      expected_11 = 128'h5886ca5d2e2f31d77e0af1fa27cf73c3;
      expected_12 = 128'h749c47ab18501ddae2757e4f7401905a;
      expected_13 = 128'hcafaaae3e4d59b349adf6acebd10190d;
      expected_14 = 128'hfe4890d1e6188d0b046df344706c631e;

      test_key_256(nist_key256,
                   expected_00, expected_01, expected_02, expected_03,
                   expected_04, expected_05, expected_06, expected_07,
                   expected_08, expected_09, expected_10, expected_11,
                   expected_12, expected_13, expected_14);


      display_test_result();
      $display("");
      $display("*** AES core simulation done. ***");
      $finish;
    end // aes_key_mem_test
endmodule // tb_aes_key_mem

//======================================================================
// EOF tb_aes_key_mem.v
//======================================================================