diff --git a/hw/application_fpga/core/tk1/tb/tb_tk1.v b/hw/application_fpga/core/tk1/tb/tb_tk1.v
index d4026e5..a8d0fc0 100644
--- a/hw/application_fpga/core/tk1/tb/tb_tk1.v
+++ b/hw/application_fpga/core/tk1/tb/tb_tk1.v
@@ -296,6 +296,25 @@ module tb_tk1 ();
   endtask  // init_sim
 
 
+  //----------------------------------------------------------------
+  // restore_mem_bus()
+  //
+  // Restore memory bus to its initial state
+  //----------------------------------------------------------------
+  task restore_mem_bus();
+    begin : restore_mem_bus
+      tb_cpu_addr  = 32'h0;
+      tb_cpu_instr = 1'h0;
+      tb_cpu_valid = 1'h0;
+
+      tb_cs           = 1'h0;
+      tb_we           = 1'h0;
+      tb_address      = 8'h0;
+      tb_write_data   = 32'h0;
+    end
+  endtask
+
+
   //----------------------------------------------------------------
   // write_word()
   //
@@ -674,6 +693,9 @@ module tb_tk1 ();
       tb_monitor     = 0;
       tb_spi_monitor = 0;
 
+      restore_mem_bus();
+      reset_dut();
+
       $display("");
       $display("--- test10: Loopback in SPI Master started.");