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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  or1200_monitor                                              ////

////                                                              ////

////  OR1200 processor monitor module                             ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2009, 2010 Authors and OPENCORES.ORG           ////

////                                                              ////

//// 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, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

`include "timescale.v"

`include "or1200_defines.v"

`include "orpsoc-testbench-defines.v"

`include "test-defines.v"

//

// Top of OR1200 inside test bench

//

`define OR1200_TOP orpsoc_testbench.dut.or1200_top

//

// Enable display_arch_state task

//

//`define OR1200_DISPLAY_ARCH_STATE

//

// Enable disassembly of instructions in execution log

//

//`define OR1200_MONITOR_PRINT_DISASSEMBLY

//

// Top of OR1200 inside test bench

//

`define CPU or1200

`define CPU_cpu or1200_cpu

`define CPU_rf or1200_rf

`define CPU_except or1200_except

`define CPU_ctrl or1200_ctrl

`define CPU_sprs or1200_sprs

module or1200_monitor;

   integer fexe;

   reg [23:0] ref;

   integer    fspr;

   integer    fgeneral;

   integer    flookup;

   integer    r3;

   integer    insns;

   //

   // Initialization

   //

   initial begin

      ref = 0;

      fexe = $fopen({"../out/",`TEST_NAME_STRING,"-executed.log"});

      $timeformat (-9, 2, " ns", 12);

      fspr = $fopen({"../out/",`TEST_NAME_STRING,"-sprs.log"});

      fgeneral = $fopen({"../out/",`TEST_NAME_STRING,"-general.log"});

      flookup = $fopen({"../out/",`TEST_NAME_STRING,"-lookup.log"});

      insns = 0;

   end

   //

   // Get GPR

   //

   task get_gpr;

      input     [4:0]    gpr_no;

      output [31:0]      gpr;

      integer           j;

      begin

 `ifdef OR1200_RFRAM_GENERIC

         for(j = 0; j < 32; j = j + 1) begin

            gpr[j] = `OR1200_TOP.`CPU_cpu.`CPU_rf.rf_a.mem[gpr_no*32+j];

         end

 `else

         //gpr = `OR1200_TOP.`CPU_cpu.`CPU_rf.rf_a.mem[gpr_no];

         gpr = `OR1200_TOP.`CPU_cpu.`CPU_rf.rf_a.get_gpr(gpr_no);

 `endif

      end

   endtask

   //

   // Write state of the OR1200 registers into a file

   //

   // Limitation: only a small subset of register file RAMs

   // are supported

   //

   task display_arch_state;

      reg [5:0] i;

      reg [31:0] r;

      integer    j;

      begin

`ifdef OR1200_DISPLAY_ARCH_STATE

         ref = ref + 1;

         $fdisplay(flookup, "Instruction %d: %t", insns, $time);

         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h", insns,

                 `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc,

                 `OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);

 `ifdef OR1200_MONITOR_PRINT_DISASSEMBLY

         $fwrite(fexe,"\t");

         // Decode the instruction, print it out

         or1200_print_op(`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);

 `endif

         for(i = 0; i < 32; i = i + 1) begin

            if (i % 4 == 0)

              $fdisplay(fexe);

            get_gpr(i, r);

            $fwrite(fexe, "GPR%d: %h  ", i, r);

         end

         $fdisplay(fexe);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.sr;

         $fwrite(fexe, "SR   : %h  ", r);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.epcr;

         $fwrite(fexe, "EPCR0: %h  ", r);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.eear;

         $fwrite(fexe, "EEAR0: %h  ", r);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.esr;

         $fdisplay(fexe, "ESR0 : %h", r);

`endif //  `ifdef OR1200_DISPLAY_ARCH_STATE

`ifdef OR1200_DISPLAY_EXECUTED

         ref = ref + 1;

         $fdisplay(flookup, "Instruction %d: %t", insns, $time);

         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h", insns, `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc, `OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);

`endif

         insns = insns + 1;

end

   endtask // display_arch_state

   /* Keep a trace buffer of the last lot of instructions and addresses

    * "executed",as read from the writeback stage, and cause a $finish if we hit

    * an instruction that is invalid, such as all zeros.

    * Currently, only breaks on an all zero instruction, but should probably be

    * made to break for anything with an X in it too. And of course ideally this

    * shouldn't be needed - but is handy if someone changes something and stops

    * the test continuing forever.

    */

   integer num_nul_inst;

   initial num_nul_inst = 0;

   task monitor_for_crash;

`define OR1200_MONITOR_CRASH_TRACE_SIZE 32

      //Trace buffer of 32 instructions

      reg [31:0] insn_trace [0:`OR1200_MONITOR_CRASH_TRACE_SIZE-1];

      //Trace buffer of the addresses of those instructions

      reg [31:0] addr_trace [0:`OR1200_MONITOR_CRASH_TRACE_SIZE-1];

      integer i;

     begin

        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h00000000)

          num_nul_inst = num_nul_inst + 1;

        else

          num_nul_inst = 0; // Reset it

        if (num_nul_inst == 1000) // Sat a loop a bit too long...

          begin

             $fdisplay(fgeneral, "ERROR - no instruction at PC %h",

                       `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc);

             $fdisplay(fgeneral, "Crash trace: Last %d instructions: ",

                       `OR1200_MONITOR_CRASH_TRACE_SIZE);

             $fdisplay(fgeneral, "PC\t\tINSTR");

             for(i=`OR1200_MONITOR_CRASH_TRACE_SIZE-1;i>=0;i=i-1) begin

                $fdisplay(fgeneral, "%h\t%h",addr_trace[i], insn_trace[i]);

             end

             #100 $finish;

          end

        else

          begin

             for(i=`OR1200_MONITOR_CRASH_TRACE_SIZE-1;i>0;i=i-1) begin

                insn_trace[i] = insn_trace[i-1];

                addr_trace[i] = addr_trace[i-1];

             end

             insn_trace[0] = `OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn;

             addr_trace[0] = `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc;

          end

     end

   endtask // monitor_for_crash

   //

   // Write state of the OR1200 registers into a file; version for exception

   //

   task display_arch_state_except;

      reg [5:0] i;

      reg [31:0] r;

      integer    j;

      begin

`ifdef OR1200_DISPLAY_ARCH_STATE

         ref = ref + 1;

         $fdisplay(flookup, "Instruction %d: %t", insns, $time);

         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h  (exception)", insns, `OR1200_TOP.`CPU_cpu.`CPU_except.ex_pc, `OR1200_TOP.`CPU_cpu.`CPU_ctrl.ex_insn);

         for(i = 0; i < 32; i = i + 1) begin

            if (i % 4 == 0)

              $fdisplay(fexe);

            get_gpr(i, r);

            $fwrite(fexe, "GPR%d: %h  ", i, r);

         end

         $fdisplay(fexe);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.sr;

         $fwrite(fexe, "SR   : %h  ", r);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.epcr;

         $fwrite(fexe, "EPCR0: %h  ", r);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.eear;

         $fwrite(fexe, "EEAR0: %h  ", r);

         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.esr;

         $fdisplay(fexe, "ESR0 : %h", r);

         insns = insns + 1;

`endif //  `ifdef OR1200_DISPLAY_ARCH_STATE

`ifdef OR1200_DISPLAY_EXECUTED

         ref = ref + 1;

         $fdisplay(flookup, "Instruction %d: %t", insns, $time);

         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h  (exception)", insns,

                 `OR1200_TOP.`CPU_cpu.`CPU_except.ex_pc,

                 `OR1200_TOP.`CPU_cpu.`CPU_ctrl.ex_insn);

         insns = insns + 1;

`endif

end

   endtask

   integer iwb_progress;

   reg [31:0] iwb_progress_addr;

   //

   // WISHBONE bus checker

   //

   always @(posedge `OR1200_TOP.iwb_clk_i)

     if (`OR1200_TOP.iwb_rst_i) begin

        iwb_progress = 0;

        iwb_progress_addr = `OR1200_TOP.iwb_adr_o;

     end

     else begin

        if (`OR1200_TOP.iwb_cyc_o && (iwb_progress != 2)) begin

           iwb_progress = 1;

        end

        if (`OR1200_TOP.iwb_stb_o) begin

           if (iwb_progress >= 1) begin

              if (iwb_progress == 1)

                iwb_progress_addr = `OR1200_TOP.iwb_adr_o;

              iwb_progress = 2;

           end

           else begin

              $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_stb_o raised without `OR1200_TOP.iwb_cyc_o, at %t\n", $time);

              #100 $finish;

           end

        end

        if (`OR1200_TOP.iwb_ack_i & `OR1200_TOP.iwb_err_i) begin

           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_ack_i and `OR1200_TOP.iwb_err_i raised at the same time, at %t\n", $time);

        end

        if ((iwb_progress == 2) && (iwb_progress_addr != `OR1200_TOP.iwb_adr_o)) begin

           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_adr_o changed while waiting for `OR1200_TOP.iwb_err_i/`OR1200_TOP.iwb_ack_i, at %t\n", $time);

           #100 $finish;

        end

        if (`OR1200_TOP.iwb_ack_i | `OR1200_TOP.iwb_err_i)

          if (iwb_progress == 2) begin

             iwb_progress = 0;

             iwb_progress_addr = `OR1200_TOP.iwb_adr_o;

          end

          else begin

             $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_ack_i/`OR1200_TOP.iwb_err_i raised without `OR1200_TOP.iwb_cyc_i/`OR1200_TOP.iwb_stb_i, at %t\n", $time);

             #100 $finish;

          end

        if ((iwb_progress == 2) && !`OR1200_TOP.iwb_stb_o) begin

           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_stb_o lowered without `OR1200_TOP.iwb_err_i/`OR1200_TOP.iwb_ack_i, at %t\n", $time);

           #100 $finish;

        end

     end

   integer dwb_progress;

reg [31:0] dwb_progress_addr;

//

// WISHBONE bus checker

//

always @(posedge `OR1200_TOP.dwb_clk_i)

  if (`OR1200_TOP.dwb_rst_i)

    dwb_progress = 0;

  else begin

     if (`OR1200_TOP.dwb_cyc_o && (dwb_progress != 2))

       dwb_progress = 1;

     if (`OR1200_TOP.dwb_stb_o)

       if (dwb_progress >= 1) begin

          if (dwb_progress == 1)

            dwb_progress_addr = `OR1200_TOP.dwb_adr_o;

          dwb_progress = 2;

       end

       else begin

          $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_stb_o raised without `OR1200_TOP.dwb_cyc_o, at %t\n", $time);

          #100 $finish;

       end

     if (`OR1200_TOP.dwb_ack_i & `OR1200_TOP.dwb_err_i) begin

        $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_ack_i and `OR1200_TOP.dwb_err_i raised at the same time, at %t\n", $time);

     end

     if ((dwb_progress == 2) && (dwb_progress_addr != `OR1200_TOP.dwb_adr_o)) begin

        $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_adr_o changed while waiting for `OR1200_TOP.dwb_err_i/`OR1200_TOP.dwb_ack_i, at %t\n", $time);

        #100 $finish;

     end

     if (`OR1200_TOP.dwb_ack_i | `OR1200_TOP.dwb_err_i)

       if (dwb_progress == 2) begin

          dwb_progress = 0;

          dwb_progress_addr = `OR1200_TOP.dwb_adr_o;

       end

       else begin

          $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_ack_i/`OR1200_TOP.dwb_err_i raised without `OR1200_TOP.dwb_cyc_i/`OR1200_TOP.dwb_stb_i, at %t\n", $time);

          #100 $finish;

       end

     if ((dwb_progress == 2) && !`OR1200_TOP.dwb_stb_o) begin

        $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_stb_o lowered without `OR1200_TOP.dwb_err_i/`OR1200_TOP.dwb_ack_i, at %t\n", $time);

        #100 $finish;

     end

       end

//

// Hooks for:

// - displaying registers

// - end of simulation

// - access to SPRs

//

   always @(posedge `OR1200_TOP.`CPU_cpu.`CPU_ctrl.clk)

     if (!`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_freeze) begin

//      #2;

        if (((`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn[31:26] != `OR1200_OR32_NOP)

             | !`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn[16])

            & !(`OR1200_TOP.`CPU_cpu.`CPU_except.except_flushpipe &

                `OR1200_TOP.`CPU_cpu.`CPU_except.ex_dslot))

          begin

             display_arch_state;

             monitor_for_crash;

          end

        else

          if (`OR1200_TOP.`CPU_cpu.`CPU_except.except_flushpipe)

            display_arch_state_except;

        // small hack to stop simulation (l.nop 1):

        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0001) begin

           get_gpr(3, r3);

           $fdisplay(fgeneral, "%t: l.nop exit (%h)", $time, r3);

           $finish;

        end

        // debug if test (l.nop 10)

        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_000a) begin

           $fdisplay(fgeneral, "%t: l.nop dbg_if_test", $time);

`ifdef DBG_IF_MODEL

           xess_top.i_xess_fpga.dbg_if_model.dbg_if_test_go = 1;

`endif

        end

        // simulation reports (l.nop 2)

        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0002) begin

           get_gpr(3, r3);

           $fdisplay(fgeneral, "%t: l.nop report (%h)", $time, r3);

        end

        // simulation printfs (l.nop 3)

        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0003) begin

           get_gpr(3, r3);

           $fdisplay(fgeneral, "%t: l.nop printf (%h)", $time, r3);

        end

        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0004) begin

           // simulation putc (l.nop 4)

           get_gpr(3, r3);

           $write("%c", r3);

           $fdisplay(fgeneral, "%t: l.nop putc (%c)", $time, r3);

        end

        if (`OR1200_TOP.`CPU_cpu.alu_op/*`CPU_sprs.sprs_op*/ ==

            `OR1200_ALUOP_MTSR)  // l.mtspr

          $fdisplay(fspr, "%t: Write to SPR : [%h] <- %h", $time,

                    `OR1200_TOP.`CPU_cpu.alu_op/*`CPU_sprs.spr_addr*/,

                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_dat_o);

        if (`OR1200_TOP.`CPU_cpu.alu_op/*`CPU_sprs.sprs_op*/ ==

            `OR1200_ALUOP_MFSR)  // l.mfspr

          $fdisplay(fspr, "%t: Read from SPR: [%h] -> %h", $time,

                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_addr,

                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.to_wbmux);

     end

`ifdef VERSATILE_SDRAM

 `define SDRAM_TOP design_testbench.sdram0

   // Bit selects to define the bank

   // 32 MB part with 4 banks

 `define SDRAM_BANK_SEL_BITS 24:23

 `define SDRAM_WORD_SEL_TOP_BIT 22

   // Gets instruction word from correct bank

   task get_insn_from_sdram;

      input [31:0] addr;

      output [31:0] insn;

      reg [`SDRAM_WORD_SEL_TOP_BIT-1:0] word_addr;

      begin

         word_addr = addr[`SDRAM_WORD_SEL_TOP_BIT:2];

         if (addr[`SDRAM_BANK_SEL_BITS] == 2'b00)

           begin

              //$display("%t: get_insn_from_sdram bank0, word 0x%h, (%h and %h in SDRAM)", $time, word_addr, `SDRAM_TOP.Bank0[{word_addr,1'b0}], `SDRAM_TOP.Bank0[{word_addr,1'b1}]);         

              insn[15:0] = `SDRAM_TOP.Bank0[{word_addr,1'b1}];

              insn[31:16] = `SDRAM_TOP.Bank0[{word_addr,1'b0}];

           end

      end

   endtask // get_insn_from_sdram

`endif //  `ifdef VERSATILE_SDRAM

`ifdef XILINX_DDR2

 `define DDR2_TOP design_testbench.gen_cs[0]

   // Gets instruction word from correct bank

   task get_insn_from_xilinx_ddr2;

      input [31:0] addr;

      output [31:0] insn;

      reg [16*8-1:0] ddr2_array_line0,ddr2_array_line1,ddr2_array_line2,ddr2_array_line3;

      integer        word_in_line_num;

      begin

        // Get our 4 128-bit chunks (8 half-words in each!! Confused yet?), 16 words total

         `DDR2_TOP.gen[0].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line0);

         `DDR2_TOP.gen[1].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line1);

         `DDR2_TOP.gen[2].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line2);

         `DDR2_TOP.gen[3].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line3);

         case (addr[5:2])

           4'h0:

             begin

                insn[15:0] = ddr2_array_line0[15:0];

                insn[31:16] = ddr2_array_line1[15:0];

             end

           4'h1:

             begin

                insn[15:0] = ddr2_array_line2[15:0];

                insn[31:16] = ddr2_array_line3[15:0];

             end

           4'h2:

             begin

                insn[15:0] = ddr2_array_line0[31:16];

                insn[31:16] = ddr2_array_line1[31:16];

             end

           4'h3:

             begin

                insn[15:0] = ddr2_array_line2[31:16];

                insn[31:16] = ddr2_array_line3[31:16];

             end

           4'h4:

             begin

                insn[15:0] = ddr2_array_line0[47:32];

                insn[31:16] = ddr2_array_line1[47:32];

             end

           4'h5:

             begin

                insn[15:0] = ddr2_array_line2[47:32];

                insn[31:16] = ddr2_array_line3[47:32];

             end

           4'h6:

             begin

                insn[15:0] = ddr2_array_line0[63:48];

                insn[31:16] = ddr2_array_line1[63:48];

             end

           4'h7:

             begin

                insn[15:0] = ddr2_array_line2[63:48];

                insn[31:16] = ddr2_array_line3[63:48];

             end

           4'h8:

             begin

                insn[15:0] = ddr2_array_line0[79:64];

                insn[31:16] = ddr2_array_line1[79:64];

             end

           4'h9:

             begin

                insn[15:0] = ddr2_array_line2[79:64];

                insn[31:16] = ddr2_array_line3[79:64];

             end

           4'ha:

             begin

                insn[15:0] = ddr2_array_line0[95:80];

                insn[31:16] = ddr2_array_line1[95:80];

             end

           4'hb:

             begin

                insn[15:0] = ddr2_array_line2[95:80];

                insn[31:16] = ddr2_array_line3[95:80];

             end

           4'hc:

             begin

                insn[15:0] = ddr2_array_line0[111:96];

                insn[31:16] = ddr2_array_line1[111:96];

             end

           4'hd:

             begin

                insn[15:0] = ddr2_array_line2[111:96];

                insn[31:16] = ddr2_array_line3[111:96];

             end

           4'he:

             begin

                insn[15:0] = ddr2_array_line0[127:112];

                insn[31:16] = ddr2_array_line1[127:112];

             end

           4'hf:

             begin

                insn[15:0] = ddr2_array_line2[127:112];

                insn[31:16] = ddr2_array_line3[127:112];

             end

         endcase // case (addr[5:2])

      end

   endtask // get_insn_from_xilinx_ddr2

`endif

   task get_insn_from_memory;

      input [31:0] id_pc;

      output [31:0] insn;

      begin

         // do a decode of which server we should look in

         case (id_pc[31:28])

`ifdef VERSATILE_SDRAM

           4'h0:

             get_insn_from_sdram(id_pc, insn);

`endif

`ifdef XILINX_DDR2

           4'h0:

             get_insn_from_xilinx_ddr2(id_pc, insn);

`endif

           4'hf:

             // Flash isn't stored in a memory, it's an FSM so just skip/ignore

             insn = `OR1200_TOP.`CPU_cpu.`CPU_ctrl.id_insn;

           default:

             begin

                $fdisplay(fgeneral, "%t: Unknown memory server for address 0x%h", $time,id_pc);

                insn = 32'hxxxxxxxx; // Unknown server

             end

         endcase // case (id_pc[31:28])

      end

   endtask // get_insn_from_memory

    reg [31:0] mem_word;

   reg [31:0] last_addr = 0;

   reg [31:0] last_mem_word;

//`define TRIGGER_FOR_CHECK (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.id_void === 1'b0)

   // Disabled:

`define TRIGGER_FOR_CHECK 0

`define INSN_TO_CHECK `OR1200_TOP.`CPU_cpu.`CPU_ctrl.id_insn

`define PC_TO_CHECK `OR1200_TOP.`CPU_cpu.`CPU_except.id_pc

   // Check instruction in decode stage is what is in the RAM

   always @(posedge `OR1200_TOP.`CPU_cpu.`CPU_ctrl.clk)

     begin

        if (`TRIGGER_FOR_CHECK)

          begin

             // Check if it's a new PC - will also get triggered if the

             // instruction has changed since we last checked it

             if ((`PC_TO_CHECK !== last_addr) ||

                 (last_mem_word != `INSN_TO_CHECK))

               begin

                  // Decode stage not void, check instruction

                  // get PC

                  get_insn_from_memory(`PC_TO_CHECK, mem_word);

                  // Debugging output to prove it's doing something!

                  //$display("%t: Checking instruction for address 0x%h - memory had 0x%h, CPU had 0x%h", $time, `PC_TO_CHECK, mem_word, `INSN_TO_CHECK);

                  if (mem_word !== `INSN_TO_CHECK)

                    begin

                       $fdisplay(fgeneral, "%t: Instruction mismatch for address 0x%h - memory had 0x%h, CPU had 0x%h", $time, `PC_TO_CHECK, mem_word, `INSN_TO_CHECK);

                       #20

                         $finish;

                    end

                  last_addr = `PC_TO_CHECK;

                  last_mem_word = mem_word;

               end // if (`PC_TO_CHECK !== last_addr)

          end

     end // always @ (posedge `OR1200_TOP.`CPU_cpu.`CPU_ctrl.clk)

   /////////////////////////////////////////////////////////////////////////

   // Instruction decode task

   /////////////////////////////////////////////////////////////////////////

`define OR32_OPCODE_POS 31:26

`define OR32_J_BR_IMM_POS 25:0

`define OR32_RD_POS 25:21

`define OR32_RA_POS 20:16

`define OR32_RB_POS 15:11

`define OR32_ALU_OP_POS 3:0

`define OR32_SHROT_OP_POS 7:6

`define OR32_SHROTI_IMM_POS 5:0