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diff --git a/src/tb/tb_keywrap_mkmif.v b/src/tb/tb_keywrap_mkmif.v
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+++ b/src/tb/tb_keywrap_mkmif.v
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+//======================================================================
+//
+// tb_keywrap_mkm.v
+// ----------------
+// Testbench for the mkmif wrapper in keywrap.
+//
+//
+// Author: Joachim Strombergson
+// Copyright (c) 2018, NORDUnet A/S
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// - Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// - 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.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may
+//   be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// 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
+// HOLDER 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.
+//
+//======================================================================
+
+module tb_keywrap_mkm();
+
+  //----------------------------------------------------------------
+  // Parameters.
+  //----------------------------------------------------------------
+  parameter DEBUG = 1;
+
+  parameter CLK_HALF_PERIOD = 1;
+  parameter CLK_PERIOD      = 2 * CLK_HALF_PERIOD;
+
+
+  //----------------------------------------------------------------
+  // Variables, regs and wires.
+  //----------------------------------------------------------------
+  integer cycle_ctr;
+  integer error_ctr;
+  integer tc_ctr;
+
+  reg                            tb_clk;
+  reg                            tb_reset_n;
+
+
+  //----------------------------------------------------------------
+  // Device Under Test.
+  //----------------------------------------------------------------
+  keywrap_mkmif dut(
+                    .clk(tb_clk),
+                    .reset_n(tb_reset_n),
+
+                    .mkm_spi_sclk(),
+                    .mkm_spi_cs_n(),
+                    .mkm_spi_do(),
+                    .mkm_spi_di(),
+
+                    .init(),
+                    .read(),
+                    .write(),
+                    .key_status(),
+                    .ready(),
+
+                    .wr_status(),
+                    .rd_status(),
+                    .wr_key(),
+                    .rd_key
+                   );
+
+
+  //----------------------------------------------------------------
+  // 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);
+    end
+
+
+  //----------------------------------------------------------------
+  // 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     = 1'h0;
+      tb_reset_n = 1'h1
+
+      #(CLK_PERIOD);
+    end
+  endtask // init_sim
+
+
+  //----------------------------------------------------------------
+  // main
+  //----------------------------------------------------------------
+  initial
+    begin : main
+      $display("   -= Testbench for Keywrap mkmif wrapper started =-");
+      $display("    ================================================");
+      $display("");
+
+      init_sim();
+
+      $display("");
+      $display("*** Keywrap mkmif wrapper testbench done. ***");
+      $finish;
+    end // main
+
+endmodule // tb_keywrap_mkm
+
+//======================================================================
+// EOF tb_keywrap_mkm.v
+//======================================================================