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/*===========================================================================*/

/* Copyright (C) 2001 Authors                                                */

/*                                                                           */

/* This source file may be used and distributed without restriction provided */

/* that this copyright statement is not removed from the file and that any   */

/* derivative work contains the original copyright notice and the associated */

/* disclaimer.                                                               */

/*                                                                           */

/* This source file is free software; you can redistribute it and/or modify  */

/* it under the terms of the GNU Lesser General Public License as published  */

/* by the Free Software Foundation; either version 2.1 of the License, or    */

/* (at your option) any later version.                                       */

/*                                                                           */

/* This source is distributed in the hope that it will be useful, but WITHOUT*/

/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or     */

/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public       */

/* License for more details.                                                 */

/*                                                                           */

/* You should have received a copy of the GNU Lesser General Public License  */

/* along with this source; if not, write to the Free Software Foundation,    */

/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA        */

/*                                                                           */

/*===========================================================================*/

/*                            DEBUG INTERFACE                                */

/*---------------------------------------------------------------------------*/

/* Test the debug interface:                                                 */

/*                           - CPU Control features.                         */

/*                                                                           */

/* Author(s):                                                                */

/*             - Olivier Girard,    olgirard@gmail.com                       */

/*                                                                           */

/*---------------------------------------------------------------------------*/

/* $Rev: 95 $                                                                */

/* $LastChangedBy: olivier.girard $                                          */

/* $LastChangedDate: 2011-02-24 21:37:57 +0100 (Thu, 24 Feb 2011) $          */

/*===========================================================================*/

   integer test_nr;

   integer test_var;

   integer dco_clk_counter;

   always @ (negedge dco_clk)

     dco_clk_counter <=  dco_clk_counter+1;

   integer dbg_clk_counter;

   always @ (negedge dbg_clk)

     dbg_clk_counter <=  dbg_clk_counter+1;

initial

   begin

      $display(" ===============================================");

      $display("|                 START SIMULATION              |");

      $display(" ===============================================");

`ifdef DBG_EN

`ifdef DBG_UART

  `ifdef ASIC

      test_nr = 0;

      #1 dbg_en = 0;

      repeat(30) @(posedge dco_clk);

      stimulus_done = 0;

      // Make sure the CPU always starts executing when the

      // debug interface is disabled during POR.

      // Also make sure that the debug interface clock is stopped

      // and that it is under reset

      //--------------------------------------------------------

      dbg_en  = 0;

      test_nr = 1;

      @(negedge dco_clk) dbg_clk_counter = 0;

      repeat(300) @(posedge dco_clk);

      if (r14 === 16'h0000)         tb_error("====== CPU is stopped event though the debug interface is disabled - test 1 =====");

      if (dbg_clk_counter !== 0)    tb_error("====== DBG_CLK is not stopped (test 1) =====");

      if (dbg_rst          == 1'b0) tb_error("====== DBG_RST signal is not active (test 3) =====");

      test_var = r14;

      // Make sure that enabling the debug interface after the POR

      // don't stop the cpu

      // Also make sure that the debug interface clock is running

      // and that its reset is released

      //--------------------------------------------------------

      dbg_en  = 1;

      test_nr = 2;

      @(negedge dco_clk) dbg_clk_counter = 0;

      repeat(300) @(posedge dco_clk);

      if (r14 === test_var[15:0])   tb_error("====== CPU is stopped when the debug interface is disabled after POR - test 4 =====");

      if (dbg_clk_counter  == 0)    tb_error("====== DBG_CLK is not running (test 5) =====");

      if (dbg_rst         !== 1'b0) tb_error("====== DBG_RST signal is active (test 6) =====");

      // Make sure that disabling the CPU with debug enabled

      // will stop the CPU

      // Also make sure that the debug interface clock is stopped

      // and that it is NOT under reset

      //--------------------------------------------------------

      cpu_en  = 0;

      dbg_en  = 1;

      test_nr = 3;

      #(6*50);

      test_var = r14;

      dbg_clk_counter = 0;

      #(300*50);

      if (r14 !== test_var[15:0])   tb_error("====== CPU is not stopped (test 7) =====");

      if (dbg_clk_counter !== 0)    tb_error("====== DBG_CLK is not running (test 8) =====");

      if (dbg_rst         !== 1'b0) tb_error("====== DBG_RST signal is active (test 9) =====");

      cpu_en  = 1;

      repeat(6) @(negedge dco_clk);

      // Create POR with debug enable and observe the

      // behavior depending on the DBG_RST_BRK_EN define

      //--------------------------------------------------------

      dbg_en  = 1;

      test_nr = 4;

      @(posedge dco_clk); // Generate POR

      reset_n = 1'b0;

      @(posedge dco_clk);

      reset_n = 1'b1;

      repeat(300) @(posedge dco_clk);

  `ifdef DBG_RST_BRK_EN

      if (r14 !== 16'h0000)       tb_error("====== CPU is not stopped with the debug interface enabled and DBG_RST_BRK_EN=1 - test 3 =====");

  `else

      if (r14 === 16'h0000)       tb_error("====== CPU is stopped with the debug interface enabled and DBG_RST_BRK_EN=0 - test 3 =====");

  `endif

      // Send uart synchronization frame

      dbg_uart_tx(DBG_SYNC);

      // Check CPU_CTL reset value

      dbg_uart_rd(CPU_CTL);

  `ifdef DBG_RST_BRK_EN

      if (dbg_uart_buf !== 16'h0030) tb_error("====== CPU_CTL wrong reset value -  test 4 =====");

  `else

      if (dbg_uart_buf !== 16'h0010) tb_error("====== CPU_CTL wrong reset value -  test 4 =====");

  `endif

      // Make sure that DBG_EN resets the debug interface

      //--------------------------------------------------------

      test_nr = 5;

      // Let the CPU run

      dbg_uart_wr(CPU_CTL,  16'h0002);

      repeat(300) @(posedge dco_clk);

      dbg_uart_wr(CPU_CTL,   16'h0000);

      dbg_uart_wr(MEM_DATA,  16'haa55);

      dbg_uart_rd(CPU_CTL);

      if (dbg_uart_buf !== 16'h0000)  tb_error("====== CPU_CTL write access failed  - test 5 =====");

      dbg_uart_rd(MEM_DATA);

      if (dbg_uart_buf !== 16'haa55)  tb_error("====== MEM_DATA write access failed - test 6 =====");

      test_var = r14;  // Backup the current register value

      @(posedge dco_clk); // Resets the debug interface

      dbg_en = 1'b0;

      repeat(2) @(posedge dco_clk);

      dbg_en = 1'b1;

      // Make sure that the register was not reseted

      if (r14 < test_var) tb_error("====== CPU was reseted with DBG_EN -  test 7 =====");

      repeat(2) @(posedge dco_clk);

      // Send uart synchronization frame

      dbg_uart_tx(DBG_SYNC);

      // Check CPU_CTL reset value

      dbg_uart_rd(CPU_CTL);

  `ifdef DBG_RST_BRK_EN

      if (dbg_uart_buf !== 16'h0030) tb_error("====== CPU_CTL wrong reset value -  test 8 =====");

  `else

      if (dbg_uart_buf !== 16'h0010) tb_error("====== CPU_CTL wrong reset value -  test 8 =====");

  `endif

      dbg_uart_rd(MEM_DATA);

      if (dbg_uart_buf !== 16'h0000) tb_error("====== MEM_DATA read access failed - test 9 =====");

      // Make sure that RESET_N resets the debug interface

      //--------------------------------------------------------

      test_nr = 6;

      // Let the CPU run

      dbg_uart_wr(CPU_CTL,  16'h0002);

      repeat(300) @(posedge dco_clk);

      dbg_uart_wr(CPU_CTL,   16'h0000);

      dbg_uart_wr(MEM_DATA,  16'haa55);

      dbg_uart_rd(CPU_CTL);

      if (dbg_uart_buf !== 16'h0000)  tb_error("====== CPU_CTL write access failed  - test 10 =====");

      dbg_uart_rd(MEM_DATA);

      if (dbg_uart_buf !== 16'haa55)  tb_error("====== MEM_DATA write access failed - test 11 =====");

      test_nr = 7;

      @(posedge dco_clk); // Generates POR

      reset_n = 1'b0;

      repeat(2) @(posedge dco_clk);

      reset_n = 1'b1;

      // Make sure that the register was reseted

      if (r14 !== 16'h0000) tb_error("====== CPU was not reseted with RESET_N -  test 12 =====");

      repeat(2) @(posedge dco_clk);

      // Send uart synchronization frame

      dbg_uart_tx(DBG_SYNC);

      test_nr = 8;

      // Check CPU_CTL reset value

      dbg_uart_rd(CPU_CTL);

  `ifdef DBG_RST_BRK_EN

      if (dbg_uart_buf !== 16'h0030) tb_error("====== CPU_CTL wrong reset value -  test 8 =====");

  `else

      if (dbg_uart_buf !== 16'h0010) tb_error("====== CPU_CTL wrong reset value -  test 8 =====");

  `endif

      dbg_uart_rd(MEM_DATA);

      if (dbg_uart_buf !== 16'h0000) tb_error("====== MEM_DATA read access failed - test 9 =====");

      // Let the CPU run

      dbg_uart_wr(CPU_CTL,  16'h0002);

      test_nr = 9;

      // Generate IRQ to terminate the test pattern

      irq[1] = 1'b1;

      @(r13);

      irq[1] = 1'b0;

      stimulus_done = 1;

  `else

      $display(" ===============================================");

      $display("|               SIMULATION SKIPPED              |");

      $display("|   (this test is not supported in FPGA mode)   |");

      $display(" ===============================================");

      $finish;

  `endif

`else

       $display(" ===============================================");

       $display("|               SIMULATION SKIPPED              |");

       $display("|   (serial debug interface UART not included)  |");

       $display(" ===============================================");

       $finish;

`endif

`else

       $display(" ===============================================");

       $display("|               SIMULATION SKIPPED              |");

       $display("|      (serial debug interface not included)    |");

       $display(" ===============================================");

       $finish;

`endif

   end