Please use tb_ethernet.v for testbench. Testbench will soon be 
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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  tb_eth_top.v                                                ////
////                                                              ////
////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/projects/ethmac/                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Igor Mohor (igorM@opencores.org)                      ////
////                                                              ////
////  All additional information is avaliable in the Readme.txt   ////
////  file.                                                       ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// 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, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.13  2002/05/03 10:25:01  mohor
// Testbench supports unaligned accesses.
//
// Revision 1.12  2002/02/26 17:01:09  mohor
// Small fixes for external/internal DMA missmatches.
//
// Revision 1.11  2002/02/16 13:06:59  mohor
// EXTERNAL_DMA used instead of WISHBONE_DMA.
//
// Revision 1.10  2002/02/16 07:22:15  mohor
// Testbench fixed, code simplified, unused signals removed.
//
// Revision 1.9  2002/02/14 20:14:38  billditt
// Added separate tests for Multicast, Unicast, Broadcast
//
// Revision 1.8  2002/02/12 20:24:00  mohor
// HASH0 and HASH1 register read/write added.
//
// Revision 1.7  2002/02/06 14:11:35  mohor
// non-DMA host interface added. Select the right configutation in eth_defines.
//
// Revision 1.6  2001/12/08 12:36:00  mohor
// TX_BD_NUM register added instead of the RB_BD_ADDR.
//
// Revision 1.5  2001/10/19 11:24:04  mohor
// Number of addresses (wb_adr_i) minimized.
//
// Revision 1.4  2001/10/19 08:46:53  mohor
// eth_timescale.v changed to timescale.v This is done because of the
// simulation of the few cores in a one joined project.
//
// Revision 1.3  2001/09/24 14:55:49  mohor
// Defines changed (All precede with ETH_). Small changes because some
// tools generate warnings when two operands are together. Synchronization
// between two clocks domains in eth_wishbonedma.v is changed (due to ASIC
// demands).
//
// Revision 1.2  2001/08/15 14:04:30  mohor
// Signal names changed on the top level for easier pad insertion (ASIC).
//
// Revision 1.1  2001/08/06 14:41:09  mohor
// A define FPGA added to select between Artisan RAM (for ASIC) and Block Ram (For Virtex).
// Include files fixed to contain no path.
// File names and module names changed ta have a eth_ prologue in the name.
// File eth_timescale.v is used to define timescale
// All pin names on the top module are changed to contain _I, _O or _OE at the end.
// Bidirectional signal MDIO is changed to three signals (Mdc_O, Mdi_I, Mdo_O
// and Mdo_OE. The bidirectional signal must be created on the top level. This
// is done due to the ASIC tools.
//
// Revision 1.1  2001/07/30 21:46:09  mohor
// Directory structure changed. Files checked and joind together.
//
//
//
//
//



`include "tb_eth_defines.v"
`include "eth_defines.v"
`include "timescale.v"

module tb_eth_top();


parameter Tp = 1;


reg           WB_CLK_I;
reg           WB_RST_I;
reg   [31:0]  WB_DAT_I;

reg   [31:0]  WB_ADR_I;
reg    [3:0]  WB_SEL_I;
reg           WB_WE_I;
reg           WB_CYC_I;
reg           WB_STB_I;

wire  [31:0]  WB_DAT_O;
wire          WB_ACK_O;
wire          WB_ERR_O;
reg    [1:0]  WB_ACK_I;

// WISHBONE master
wire    [31:0]    m_wb_adr_o;
wire     [3:0]    m_wb_sel_o;
wire              m_wb_we_o;
reg     [31:0]    m_wb_dat_i;
wire    [31:0]    m_wb_dat_o;
wire              m_wb_cyc_o;
wire              m_wb_stb_o;
reg               m_wb_ack_i;
reg               m_wb_err_i;

reg           MTxClk;
wire   [3:0]  MTxD;
wire          MTxEn;
wire          MTxErr;

reg           MRxClk;
reg    [3:0]  MRxD;
reg           MRxDV;
reg           MRxErr;
reg           MColl;
reg           MCrs;

reg           Mdi_I;
wire          Mdo_O;
wire          Mdo_OE;
wire          Mdc_O;


reg [7:0] memory0 [0:65535];
reg [7:0] memory1 [0:65535];
reg [7:0] memory2 [0:65535];
reg [7:0] memory3 [0:65535];

reg WishboneBusy;
reg StartTB;
reg [9:0] TxBDIndex;
reg [9:0] RxBDIndex;

reg LogEnable;

  integer mcd1;
  integer mcd2;

reg [5:0] g_last_txbd;

// Connecting Ethernet top module

eth_top ethtop
(
  // WISHBONE common
  .wb_clk_i(WB_CLK_I), .wb_rst_i(WB_RST_I), .wb_dat_i(WB_DAT_I), .wb_dat_o(WB_DAT_O), 

  // WISHBONE slave
 	.wb_adr_i(WB_ADR_I[11:2]), .wb_sel_i(WB_SEL_I), .wb_we_i(WB_WE_I),   .wb_cyc_i(WB_CYC_I), 
 	.wb_stb_i(WB_STB_I),       .wb_ack_o(WB_ACK_O), .wb_err_o(WB_ERR_O), 
 	
// WISHBONE master
  .m_wb_adr_o(m_wb_adr_o), .m_wb_sel_o(m_wb_sel_o), .m_wb_we_o(m_wb_we_o), .m_wb_dat_i(m_wb_dat_i), 
  .m_wb_dat_o(m_wb_dat_o), .m_wb_cyc_o(m_wb_cyc_o), .m_wb_stb_o(m_wb_stb_o), .m_wb_ack_i(m_wb_ack_i), 
  .m_wb_err_i(m_wb_err_i), 

  //TX
  .mtx_clk_pad_i(MTxClk), .mtxd_pad_o(MTxD), .mtxen_pad_o(MTxEn), .mtxerr_pad_o(MTxErr),

  //RX
  .mrx_clk_pad_i(MRxClk), .mrxd_pad_i(MRxD), .mrxdv_pad_i(MRxDV), .mrxerr_pad_i(MRxErr), 
  .mcoll_pad_i(MColl),    .mcrs_pad_i(MCrs), 
  
  // MIIM
  .mdc_pad_o(Mdc_O), .md_pad_i(Mdi_I), .md_pad_o(Mdo_O), .md_padoe_o(Mdo_OE),
  
  .int_o()
);


bench_cop i_bench_cop
(
  // WISHBONE common
  .wb_clk_i(WB_CLK_I), .wb_rst_i(WB_RST_I), .wb_dat_i(WB_DAT_I), .wb_dat_o(WB_DAT_O), 

  // WISHBONE slave
 	.wb_adr_i(WB_ADR_I[11:2]), .wb_sel_i(WB_SEL_I), .wb_we_i(WB_WE_I),   .wb_cyc_i(WB_CYC_I), 
 	.wb_stb_i(WB_STB_I),       .wb_ack_o(WB_ACK_O), .wb_err_o(WB_ERR_O), 
 	
// WISHBONE master
  .m_wb_adr_o(m_wb_adr_o), .m_wb_sel_o(m_wb_sel_o), .m_wb_we_o(m_wb_we_o), .m_wb_dat_i(m_wb_dat_i), 
  .m_wb_dat_o(m_wb_dat_o), .m_wb_cyc_o(m_wb_cyc_o), .m_wb_stb_o(m_wb_stb_o), .m_wb_ack_i(m_wb_ack_i), 
  .m_wb_err_i(m_wb_err_i), 

  //TX
  .mtx_clk_pad_i(MTxClk), .mtxd_pad_o(MTxD), .mtxen_pad_o(MTxEn), .mtxerr_pad_o(MTxErr),

  //RX
  .mrx_clk_pad_i(MRxClk), .mrxd_pad_i(MRxD), .mrxdv_pad_i(MRxDV), .mrxerr_pad_i(MRxErr), 
  .mcoll_pad_i(MColl),    .mcrs_pad_i(MCrs), 
  
  // MIIM
  .mdc_pad_o(Mdc_O), .md_pad_i(Mdi_I), .md_pad_o(Mdo_O), .md_padoe_o(Mdo_OE),
  
  .int_o()
);







initial
begin
  WB_CLK_I  =  1'b0;
  WB_DAT_I  = 32'h0;
  WB_ADR_I  = 32'h0;
  WB_SEL_I  =  4'h0;
  WB_WE_I   =  1'b0;
  WB_CYC_I  =  1'b0;
  WB_STB_I  =  1'b0;

  m_wb_ack_i = 0;
  m_wb_err_i = 0;
  MTxClk    =  1'b0;
  MRxClk    =  1'b0;
  MRxD      =  4'h0;
  MRxDV     =  1'b0;
  MRxErr    =  1'b0;
  MColl     =  1'b0;
  MCrs      =  1'b0;
  Mdi_I     =  1'b0;

  WishboneBusy = 1'b0;
  TxBDIndex = 10'h0;
  RxBDIndex = 10'h0;
  LogEnable = 1'b1;
  g_last_txbd = 6'h0;
end


// Reset pulse
initial
begin
  mcd1 = $fopen("ethernet_tx.log");
  mcd2 = $fopen("ethernet_rx.log");
  WB_RST_I =  1'b1;
  #100 WB_RST_I =  1'b0;
  #100 StartTB  =  1'b1;
end



// Generating WB_CLK_I clock
always
begin
//  forever #2.5 WB_CLK_I = ~WB_CLK_I;  // 2*2.5 ns -> 200.0 MHz    
//  forever #5 WB_CLK_I = ~WB_CLK_I;  // 2*5 ns -> 100.0 MHz    
//  forever #10 WB_CLK_I = ~WB_CLK_I;  // 2*10 ns -> 50.0 MHz    
  forever #12.5 WB_CLK_I = ~WB_CLK_I;  // 2*12.5 ns -> 40 MHz    
//  forever #15 WB_CLK_I = ~WB_CLK_I;  // 2*10 ns -> 33.3 MHz    
//  forever #20 WB_CLK_I = ~WB_CLK_I;  // 2*20 ns -> 25 MHz    
//  forever #25 WB_CLK_I = ~WB_CLK_I;  // 2*25 ns -> 20.0 MHz
//  forever #31.25 WB_CLK_I = ~WB_CLK_I;  // 2*31.25 ns -> 16.0 MHz    
//  forever #50 WB_CLK_I = ~WB_CLK_I;  // 2*50 ns -> 10.0 MHz
//  forever #55 WB_CLK_I = ~WB_CLK_I;  // 2*55 ns ->  9.1 MHz    
end

// Generating MTxClk clock
always
begin
//  #3 forever #20 MTxClk = ~MTxClk;   // 2*20 ns -> 25 MHz
  #3 forever #200 MTxClk = ~MTxClk;   // 2*200 ns -> 2.5 MHz
end

// Generating MRxClk clock
always
begin
//  #16 forever #20 MRxClk = ~MRxClk;   // 2*20 ns -> 25 MHz
  #16 forever #200 MRxClk = ~MRxClk;   // 2*200 ns -> 2.5 MHz
//  #16 forever #62.5 MRxClk = ~MRxClk;   // 2*62.5 ns -> 8 MHz       // just for testing purposes
end


initial
begin
  wait(StartTB);  // Start of testbench
  
  // Reset eth MAC core
  WishboneWrite(32'h00000800, {26'h0, `ETH_MODER_ADR<<2});     // r_Rst = 1
  WishboneWrite(32'h00000000, {26'h0, `ETH_MODER_ADR<<2});     // r_Rst = 0

  InitializeMemory;

// Select which test you want to run:
  //  TestTxAndRx;
    TestFullDuplex;
  //  TestUnicast;
  //  TestBroadcast;
  //  TestMulticast;
end
  
task TestTxAndRx;

 integer ii, jj;
 integer data_in, bd, pointer;

 begin
  WishboneWrite(32'h00000800, {26'h0, `ETH_MODER_ADR<<2});     // r_Rst = 1
  WishboneWrite(32'h00000000, {26'h0, `ETH_MODER_ADR<<2});     // r_Rst = 0
  WishboneWrite(32'h00000080, {26'h0, `ETH_TX_BD_NUM_ADR<<2}); // r_RxBDAddress = 0x80

//  WishboneWrite(32'h0000a06b, {26'h0, `ETH_MODER_ADR<<2});     // RxEn, Txen, CrcEn, Pad en, half duplex, 
  WishboneWrite(32'h0000a46b, {26'h0, `ETH_MODER_ADR<<2});     // RxEn, Txen, CrcEn, Pad en, full duplex, 
//  WishboneWrite(32'h0001a06b, {26'h0, `ETH_MODER_ADR<<2});     // r_RecSmall, RxEn, Txen, CrcEn, Pad en, half duplex, 
                                                               // r_IPG, promisc On, reject broadcast 

  WishboneWrite(32'h00000004, {26'h0, `ETH_CTRLMODER_ADR<<2}); //r_TxFlow = 1

  WishboneWrite(32'h00000002, {26'h0, `ETH_MAC_ADDR1_ADR<<2}); // MAC = 000203040506
  WishboneWrite(32'h03040506, {26'h0, `ETH_MAC_ADDR0_ADR<<2});

/*
// Just few reads
  WishboneRead({26'h0, `ETH_MODER_ADR<<2}, data_in);       // Read from ETH_MODER register
  WishboneRead({26'h0, `ETH_TX_BD_NUM_ADR<<2}, data_in);       // Read from ETH_TX_BD_NUM_ADR register
  WishboneRead({26'h0, `ETH_MAC_ADDR1_ADR<<2}, data_in);       // Read from ETH_MAC_ADDR1_ADR register
  WishboneRead({26'h0, `ETH_MAC_ADDR0_ADR<<2}, data_in);       // Read from ETH_MAC_ADDR0_ADR register
*/




    for(jj=0; jj<8; jj=jj+4)
    begin
      WishboneWriteData(`TX_BUF_BASE + jj, 32'h11111111, 4'hf); // Initializing data to ff
    end

    for(jj=0; jj<8; jj=jj+4)
    begin
      WishboneWriteData(`RX_BUF_BASE + jj, 32'h11111111, 4'hf); // Initializing data to ff
    end

//  SendPacketX(16'h0064, 1'b0, 2'h3);
//  SendPacketX(16'h0064, 1'b0, 2'h2);
//  SendPacketX(16'h0064, 1'b0, 2'h1);
//  SendPacketX(16'h0064, 1'b0, 2'h0);
//  SendPacket(16'h0064, 1'b0);
//  SendPacket(16'h0011, 1'b0);
//  SendPacket(16'h0012, 1'b0);

fork
  begin
/*
  SendPacketX(16'h0064, 1'b0, 2'h1);
  SendPacketX(16'h0064, 1'b0, 2'h2);
  SendPacketX(16'h0064, 1'b0, 2'h3);
  SendPacketX(16'h0064, 1'b0, 2'h0);
*/
//    SendPacketX(16'h264, 1'b0, 2'h3);
//    SendPacketX(16'h64, 1'b0, 2'h3);
//    SendPacketX(16'h104, 1'b0, 2'h3);
  end
  
  begin
    ReceivePacketX(16'h0040, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0041, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0042, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0043, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0044, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  end

//  begin
//    for(ii=0; ii<10000; ii=ii+1)
//      begin
//        WishboneRead({22'h01, 10'b0}, data_in);  // read back
//        #100;
//      end
//  end
//join

//fork
/*
  begin
    repeat(4)
      begin
        wait(tb_eth_top.ethtop.wishbone.TxStatusWrite);   // wait until tx status is written
        @ (posedge WB_CLK_I)
        #1;
      end
  end
*/  
  begin
    wait(tb_eth_top.ethtop.wishbone.RxStatusWrite);   // wait until rx status is written
  end

join


/*
  SendPacket(16'h0013, 1'b0);
  SendPacket(16'h0014, 1'b0);

  SendPacket(16'h0030, 1'b0);
  SendPacket(16'h0031, 1'b0);
  SendPacket(16'h0032, 1'b0);
  SendPacket(16'h0033, 1'b0);
  SendPacket(16'h0025, 1'b0);
  SendPacket(16'h0045, 1'b0); 
  SendPacket(16'h0025, 1'b0);
  SendPacket(16'h0017, 1'b0);
*/

//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h3);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h2);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h1);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

//  ReceivePacket(16'h0050, 1'b0, `MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0051, 1'b0, `UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0052, 1'b0, `MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0053, 1'b0, `BROADCAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0054, 1'b0, `UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0055, 1'b0, `MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0056, 1'b0, `UNICAST_WRONG_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.


  repeat(1000) @ (posedge MRxClk);        // Waiting some time for all accesses to finish before reading out the statuses.

//  WishboneRead({24'h04, (8'h0<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h1<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h2<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h3<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h4<<2)}, RxBD);       // Read from TxBD register

  for(jj=0; jj<3; jj=jj+1)    // How many TxBD do we want to read?
  begin
      
      WishboneRead({22'h01, ((10'h0+jj[4:0]*2'h2)<<2)}, bd);       // Read from TxBD
      $display("\n(%0t)\t\tRead TxBD %0x = 0x%x", $time, jj, bd);
      if(~bd[15]) // Ready = 0?
        begin
          WishboneRead({22'h01, ((10'h0+jj[4:0]*2'h2+1'h1)<<2)}, pointer);  // Read TxBD pointer
          $display("\t\t\tRead TxBDPointer 0x=%x", pointer);
          $write("\t\t\tData:");
          for(ii=0; ii<bd[31:16]; ii=ii+4)
            begin
              WishboneReadData({pointer[31:2], 2'h0}+ii, data_in);        // Read data from Tx Pointer
              $write("\t0x%x", data_in);
            end
        end
  end


  for(jj=0; jj<3; jj=jj+1)    // How many RxBD do we want to read?
  begin
      
      WishboneRead({22'h01, ((10'h80+jj[4:0]*2'h2)<<2)}, bd);       // Read from RxBD
      $display("\n(%0t)\t\tRead RxBD %0x = 0x%x", $time, jj, bd);
      if(~bd[15]) // Empty = 0?
        begin
          WishboneRead({22'h01, ((10'h80+jj[4:0]*2'h2+1'h1)<<2)}, pointer);  // Read RxBD pointer
          $display("\t\t\tRead RxBDPointer 0x=%x", pointer);
          $write("\t\t\tData:");
          for(ii=0; ii<bd[31:16]+4; ii=ii+4)
            begin
              WishboneReadData({pointer[31:2], 2'h0} + ii, data_in);        // Read data from Rx Pointer
              $write("\t0x%x", data_in);
            end
        end
  end

  WishboneRead({22'h01, (10'h81<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h82<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h83<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h84<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h85<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h86<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h87<<2)}, data_in);       // Read from RxBD register



  #100000 $stop;
 end
endtask //TestTxAndRx





task TestFullDuplex;

 integer ii, jj;
 integer data_in, bd, pointer;
 integer addr;

 begin
  WishboneWrite(32'h00000800, {26'h0, `ETH_MODER_ADR<<2});     // r_Rst = 1
  WishboneWrite(32'h00000000, {26'h0, `ETH_MODER_ADR<<2});     // r_Rst = 0
  WishboneWrite(32'h00000080, {26'h0, `ETH_TX_BD_NUM_ADR<<2}); // r_RxBDAddress = 0x80

  WishboneWrite(32'h0000a40b, {26'h0, `ETH_MODER_ADR<<2});     // CrcEn, Pad en, full duplex, reject broadcast, RxEn, TxEn

  WishboneWrite(32'h00000002, {26'h0, `ETH_MAC_ADDR1_ADR<<2}); // MAC = 000203040506
  WishboneWrite(32'h03040506, {26'h0, `ETH_MAC_ADDR0_ADR<<2});

  initialize_txbd(5);
  initialize_rxbd(6);
  
  send_packet(48'h000123456789, 16'h0064);

  
  /*  
  for(ii=0; ii<12; ii=ii+1) begin
    addr = 32'h400 + ii*4;
    WishboneRead(addr, data_in);
    $display("\n(%0t)\t\tRead TxBD %0x = 0x%x", $time, ii, data_in);
  end

  for(ii=0; ii<14; ii=ii+1) begin
    addr = 32'h600 + ii*4;
    WishboneRead(addr, data_in);
    $display("\n(%0t)\t\tRead RxBD %0x = 0x%x", $time, ii, data_in);
  end
  */

//  WishboneRead({22'h01, 10'b0}, data_in);  // read back
//  WishboneRead({22'h01, ((10'h0+jj[4:0]*2'h2)<<2)}, bd);       // Read from TxBD
  
/*  
  for(jj=0; jj<8; jj=jj+4)
    WishboneWriteData(`TX_BUF_BASE + jj, 32'h11111111, 4'hf); // Initializing data to ff

  for(jj=0; jj<8; jj=jj+4)
    WishboneWriteData(`RX_BUF_BASE + jj, 32'h11111111, 4'hf); // Initializing data to ff


fork
  begin
  SendPacketX(16'h0064, 1'b0, 2'h1);
  SendPacketX(16'h0065, 1'b0, 2'h2);
  SendPacketX(16'h0066, 1'b0, 2'h3);
  SendPacketX(16'h0067, 1'b0, 2'h0);
  end
  
  begin
    ReceivePacketX(16'h0040, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0041, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0042, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0043, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
    ReceivePacketX(16'h0044, 1'b0, `UNICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  end
*/

//fork
/*
  begin
    repeat(4)
      begin
        wait(tb_eth_top.ethtop.wishbone.TxStatusWrite);   // wait until tx status is written
        @ (posedge WB_CLK_I)
        #1;
      end
  end
*/  

/*
  begin
    wait(tb_eth_top.ethtop.wishbone.RxStatusWrite);   // wait until rx status is written
  end

join
*/

/*
  SendPacket(16'h0013, 1'b0);
  SendPacket(16'h0014, 1'b0);

  SendPacket(16'h0030, 1'b0);
  SendPacket(16'h0031, 1'b0);
  SendPacket(16'h0032, 1'b0);
  SendPacket(16'h0033, 1'b0);
  SendPacket(16'h0025, 1'b0);
  SendPacket(16'h0045, 1'b0); 
  SendPacket(16'h0025, 1'b0);
  SendPacket(16'h0017, 1'b0);
*/

//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h3);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h2);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h1);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacketX(16'h0050, 1'b0, `MULTICAST_XFR, 2'h0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

//  ReceivePacket(16'h0050, 1'b0, `MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0051, 1'b0, `UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0052, 1'b0, `MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0053, 1'b0, `BROADCAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0054, 1'b0, `UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0055, 1'b0, `MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
//  ReceivePacket(16'h0056, 1'b0, `UNICAST_WRONG_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.


  repeat(1000) @ (posedge MRxClk);        // Waiting some time for all accesses to finish before reading out the statuses.

//  WishboneRead({24'h04, (8'h0<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h1<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h2<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h3<<2)}, RxBD);       // Read from TxBD register
//  WishboneRead({24'h04, (8'h4<<2)}, RxBD);       // Read from TxBD register

/*
  for(jj=0; jj<3; jj=jj+1)    // How many TxBD do we want to read?
  begin
      
      WishboneRead({22'h01, ((10'h0+jj[4:0]*2'h2)<<2)}, bd);       // Read from TxBD
      $display("\n(%0t)\t\tRead TxBD %0x = 0x%x", $time, jj, bd);
      if(~bd[15]) // Ready = 0?
        begin
          WishboneRead({22'h01, ((10'h0+jj[4:0]*2'h2+1'h1)<<2)}, pointer);  // Read TxBD pointer
          $display("\t\t\tRead TxBDPointer 0x=%x", pointer);
          $write("\t\t\tData:");
          for(ii=0; ii<bd[31:16]; ii=ii+4)
            begin
              WishboneReadData({pointer[31:2], 2'h0}+ii, data_in);        // Read data from Tx Pointer
              $write("\t0x%x", data_in);
            end
        end
  end


  for(jj=0; jj<3; jj=jj+1)    // How many RxBD do we want to read?
  begin
      
      WishboneRead({22'h01, ((10'h80+jj[4:0]*2'h2)<<2)}, bd);       // Read from RxBD
      $display("\n(%0t)\t\tRead RxBD %0x = 0x%x", $time, jj, bd);
      if(~bd[15]) // Empty = 0?
        begin
          WishboneRead({22'h01, ((10'h80+jj[4:0]*2'h2+1'h1)<<2)}, pointer);  // Read RxBD pointer
          $display("\t\t\tRead RxBDPointer 0x=%x", pointer);
          $write("\t\t\tData:");
          for(ii=0; ii<bd[31:16]+4; ii=ii+4)
            begin
              WishboneReadData({pointer[31:2], 2'h0} + ii, data_in);        // Read data from Rx Pointer
              $write("\t0x%x", data_in);
            end
        end
  end

  WishboneRead({22'h01, (10'h81<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h82<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h83<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h84<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h85<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h86<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h87<<2)}, data_in);       // Read from RxBD register
*/


  #100000 $stop;
 end
endtask //TestFullDuplex



task initialize_txbd;
  input [6:0] txbd_num;
  
  integer i, j;
  integer bd_status_addr, buf_addr, bd_ptr_addr;
  
  for(i=0; i<txbd_num; i=i+1) begin
    buf_addr = `TX_BUF_BASE + i * 32'h600;
    bd_status_addr = `TX_BD_BASE + i * 8;
    bd_ptr_addr = bd_status_addr + 4; 
    
    // Initializing BD - status
    if(i==txbd_num-1)
      WishboneWrite(32'h00007800, bd_status_addr);  // last BD: + WRAP
    else
      WishboneWrite(32'h00005800, bd_status_addr);  // IRQ + PAD + CRC

    WishboneWrite(buf_addr, bd_ptr_addr);   // Initializing BD - pointer
  end
endtask // initialize_txbd


task initialize_rxbd;
  input [6:0] rxbd_num;
  
  integer i, j;
  integer bd_status_addr, buf_addr, bd_ptr_addr;
  
  for(i=0; i<rxbd_num; i=i+1) begin
    buf_addr = `RX_BUF_BASE + i * 32'h600;
    bd_status_addr = `RX_BD_BASE + i * 8;
    bd_ptr_addr = bd_status_addr + 4; 
    
    // Initializing BD - status
    if(i==rxbd_num-1)
      WishboneWrite(32'h0000e000, bd_status_addr);  // last BD: + WRAP
    else
      WishboneWrite(32'h0000c000, bd_status_addr);  // IRQ + PAD + CRC

    WishboneWrite(buf_addr, bd_ptr_addr);   // Initializing BD - pointer
  end
endtask // initialize_rxbd






reg [7:0] LateCollisionCounter;
reg EnableCollisionCounter;
// Making a late collision

initial 
EnableCollisionCounter =0;  // Collision = OFF

always @ (posedge MTxClk)
begin
  if(tb_eth_top.ethtop.wishbone.TxStartFrm)
    begin
      LateCollisionCounter = 0;
    end
  else
  if(EnableCollisionCounter)
    LateCollisionCounter = LateCollisionCounter + 1;
end

// Making a late collision
always @ (posedge MTxClk)
begin
  if(LateCollisionCounter==0)
    MColl = 0;
  else
  if(LateCollisionCounter==150)
    MColl = 1;
  else
  if(LateCollisionCounter==155)
    begin
      MColl = 0;
      MCrs = 0;
      EnableCollisionCounter=0;
      LateCollisionCounter=1;
    end
end


// Switching Carrier Sense ON and OFF
always @ (posedge MTxClk)
begin
  wait(tb_eth_top.ethtop.wishbone.TxStartFrm);
  MCrs=1;
  wait(tb_eth_top.ethtop.wishbone.TxEndFrm || !MCrs);
  MCrs=0;
end


task TestUnicast;

 integer ii, jj;
 integer data_in, bd, pointer;

 begin
  $display("\nBegin TestUnicast \n");
  WishboneWrite(32'h00000800, {26'h0, `ETH_MODER_ADR, 2'h0});     // r_Rst = 1
  WishboneWrite(32'h00000000, {26'h0, `ETH_MODER_ADR, 2'h0});     // r_Rst = 0
  WishboneWrite(32'h00000080, {26'h0, `ETH_TX_BD_NUM_ADR, 2'h0}); // r_RxBDAddress = 0x80
  WishboneWrite(32'h0000204b, {26'h0, `ETH_MODER_ADR, 2'h0});     // RxEn, Txen, CrcEn, no Pad, r_IFG, promisc off, broadcast off
  WishboneWrite(32'h00000004, {26'h0, `ETH_CTRLMODER_ADR, 2'h0}); // r_TxFlow = 1

  $display("\n This Uniicast packet will be rejected, wrong address in MAC Address Regs\n");
 
  ReceivePacket(16'h0014, 1'b0,`UNICAST_XFR);    
  
  WishboneWrite(32'h03040506, {26'h0,`ETH_MAC_ADDR0_ADR ,2'h0}); // Mac Address 
  WishboneWrite(32'h00000002, {26'h0,`ETH_MAC_ADDR1_ADR ,2'h0}); // Mac Address
  
  $display("\n Set Proper Unicast Address in MAC_ADDRESS regs, resend packet\n");
  
  ReceivePacket(16'h0015, 1'b0,`UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0016, 1'b0,`MULTICAST_XFR);  // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0017, 1'b0,`UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0018, 1'b0,`BROADCAST_XFR);  // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0019, 1'b0,`UNICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  repeat(5000) @ (posedge MRxClk);        // Waiting some time for all accesses to finish before reading out the statuses.

  WishboneRead({26'h0, `ETH_MODER_ADR}, data_in);   // Read from MODER register

  WishboneRead({22'h01, (10'h80<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h81<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h82<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h83<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h84<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h85<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h86<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h87<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h88<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h89<<2)}, data_in);       // Read from RxBD register


  for(jj=0; jj<5; jj=jj+1)    // How many RxBD do we want to read?
  begin
      
      WishboneRead({22'h01, ((10'h80+jj[4:0]*2'h2)<<2)}, bd);       // Read from RxBD
      $display("\n(%0t)\t\tRead RxBD %0x = 0x%x", $time, jj, bd);
      if(~bd[15]) // Empty = 0?
        begin
          WishboneRead({22'h01, ((10'h80+jj[4:0]*2'h2+1'h1)<<2)}, pointer);  // Read RxBD pointer
          $display("\t\t\tRead RxBDPointer 0x=%x", pointer);
          $write("\t\t\tData:");
          for(ii=0; ii<bd[31:16]+4; ii=ii+4)
            begin
              WishboneReadData({pointer[31:2], 2'h0} + ii, data_in);        // Read data from Rx Pointer
              $write("\t0x%x", data_in);
            end
        end
  end


  
  #100000 $stop;
  $display("\nEnd TestUnicast \n");
end
endtask //TestUnicast

task TestMulticast;

  integer data_in;
  
 begin
  $display("\nBegin TestMulticast \n");
  WishboneWrite(32'h00000800, {26'h0, `ETH_MODER_ADR, 2'h0});     // r_Rst = 1
  WishboneWrite(32'h00000000, {26'h0, `ETH_MODER_ADR, 2'h0});     // r_Rst = 0
  WishboneWrite(32'h00000080, {26'h0, `ETH_TX_BD_NUM_ADR, 2'h0}); // r_RxBDAddress = 0x80
  WishboneWrite(32'h00002043, {26'h0, `ETH_MODER_ADR, 2'h0});     // RxEn, Txen, CrcEn, No Pad, r_IFG, promiscuos off, broadcast enable
  WishboneWrite(32'h00000004, {26'h0, `ETH_CTRLMODER_ADR, 2'h0}); // r_TxFlow = 1
  
  $display("\n This Multicast packet will be rejected by Hash Filter\n");
 
  ReceivePacket(16'h0014, 1'b0,`MULTICAST_XFR);    
  
  WishboneWrite(32'h00400000, {26'h0, `ETH_HASH1_ADR,2'h0}); // set bit 16, multicast hash 36
  WishboneRead({26'h0, `ETH_HASH1_ADR, 2'h0}, data_in);  // read back
  
  $display("\n Set Hash Filter to accept this Multicast packet, resend packet\n");
  
  ReceivePacket(16'h0015, 1'b0,`MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0016, 1'b0,`MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0017, 1'b0,`MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0018, 1'b0,`MULTICAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  repeat(5000) @ (posedge MRxClk);        // Waiting some time for all accesses to finish before reading out the statuses.

  WishboneRead({26'h0, `ETH_MODER_ADR}, data_in);   // Read from MODER register

  WishboneRead({22'h01, (10'h80<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h81<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h82<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h83<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h84<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h85<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h86<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h87<<2)}, data_in);       // Read from RxBD register
                                     
  $display("\nEnd TestMulticast \n");
  #100000 $stop;                     
end
endtask //TestMulticast


task TestBroadcast;

  integer data_in;

 begin
  $display("\n\n\nBegin TestBroadcast");
  WishboneWrite(32'h00000800, {26'h0, `ETH_MODER_ADR, 2'h0});     // r_Rst = 1
  WishboneWrite(32'h00000000, {26'h0, `ETH_MODER_ADR, 2'h0});     // r_Rst = 0
  WishboneWrite(32'h00000080, {26'h0, `ETH_TX_BD_NUM_ADR, 2'h0}); // r_RxBDAddress = 0x80

  WishboneWrite(32'h0000A04b, {26'h0, `ETH_MODER_ADR, 2'h0});     // PadEn, CrcEn, IFG=accept, Reject Broadcast, TxEn, RxEn
  WishboneWrite(32'h00000004, {26'h0, `ETH_CTRLMODER_ADR, 2'h0}); // r_TxFlow = 1

  $display("\nThis Broadcast packet will be rejected, r_BRO = 1");
  ReceivePacket(16'h0014, 1'b0,`BROADCAST_XFR);
  
  $display("\nSet r_Bro = 0, resend packet");
  WishboneWrite(32'h0000A043, {26'h0, `ETH_MODER_ADR, 2'h0});  // PadEn, CrcEn, IFG=accept, Accept Broadcast, TxEn, RxEn
  ReceivePacket(16'h0015, 1'b0,`BROADCAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  $display("\n This Broadcast packet will be rejected, r_BRO = 1");
  WishboneWrite(32'h0000A04b, {26'h0, `ETH_MODER_ADR, 2'h0});     // PadEn, CrcEn, IFG=accept, Reject Broadcast, TxEn, RxEn
  ReceivePacket(16'h0016, 1'b0,`BROADCAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  ReceivePacket(16'h0017, 1'b0,`BROADCAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  $display("\n Set r_Bro = 0, resend packet");
  WishboneWrite(32'h0000A043, {26'h0, `ETH_MODER_ADR, 2'h0});  // PadEn, CrcEn, IFG=accept, Accept Broadcast, TxEn, RxEn
  ReceivePacket(16'h0018, 1'b0,`BROADCAST_XFR);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  repeat(5000) @ (posedge MRxClk);        // Waiting some time for all accesses to finish before reading out the statuses.

  WishboneRead({26'h0, `ETH_MODER_ADR}, data_in);   // Read from MODER register

  WishboneRead({22'h01, (10'h80<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h81<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h82<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h83<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h84<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h85<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h86<<2)}, data_in);       // Read from RxBD register
  WishboneRead({22'h01, (10'h87<<2)}, data_in);       // Read from RxBD register

  #100000 $stop;
  $display("\nEnd TestBroadcast \n");
end
endtask //TestBroadcast


always @ (posedge WB_CLK_I)
begin
  if(m_wb_cyc_o & m_wb_stb_o) // Add valid address range
    begin
      repeat(2) @ (posedge WB_CLK_I);
        begin
          m_wb_ack_i <=#Tp 1'b1;
          if(~m_wb_we_o)
            begin
              #Tp;
              if(m_wb_adr_o[1:0] == 2'b00)       // word access
                begin
                  m_wb_dat_i[31:24] = memory3[{m_wb_adr_o[31:2], 2'h0}];
                  m_wb_dat_i[23:16] = memory2[{m_wb_adr_o[31:2], 2'h0}];
                  m_wb_dat_i[15:08] = memory1[{m_wb_adr_o[31:2], 2'h0}];
                  m_wb_dat_i[07:00] = memory0[{m_wb_adr_o[31:2], 2'h0}];
                end
              else if(m_wb_adr_o[1:0] == 2'b10)       // half access
                begin
                  m_wb_dat_i[31:24] = 0;
                  m_wb_dat_i[23:16] = 0;
                  m_wb_dat_i[15:08] = memory1[{m_wb_adr_o[31:2], 2'h0}];
                  m_wb_dat_i[07:00] = memory0[{m_wb_adr_o[31:2], 2'h0}];
                end
              else if(m_wb_adr_o[1:0] == 2'b01)       // byte access
                begin
                  m_wb_dat_i[31:24] = 0;
                  m_wb_dat_i[23:16] = memory2[{m_wb_adr_o[31:2], 2'h0}];
                  m_wb_dat_i[15:08] = 0;
                  m_wb_dat_i[07:00] = 0;
                end
              else if(m_wb_adr_o[1:0] == 2'b11)       // byte access
                begin
                  m_wb_dat_i[31:24] = 0;
                  m_wb_dat_i[23:16] = 0;
                  m_wb_dat_i[15:08] = 0;
                  m_wb_dat_i[07:00] = memory0[{m_wb_adr_o[31:2], 2'h0}];
                end

              $fdisplay(mcd1, "(%0t) master read (0x%0x) = 0x%0x", $time, m_wb_adr_o, m_wb_dat_i);
            end
          else
            begin
              $fdisplay(mcd2, "(%0t) master write (0x%0x) = 0x%0x", $time, m_wb_adr_o, m_wb_dat_o);
              if(m_wb_sel_o[0])
                memory0[m_wb_adr_o] = m_wb_dat_o[7:0];
              if(m_wb_sel_o[1])
                memory1[m_wb_adr_o] = m_wb_dat_o[15:8];
              if(m_wb_sel_o[2])
                memory2[m_wb_adr_o] = m_wb_dat_o[23:16];
              if(m_wb_sel_o[3])
                memory3[m_wb_adr_o] = m_wb_dat_o[31:24];
            end
        end
      @ (posedge WB_CLK_I);
      m_wb_ack_i <=#Tp 1'b0;
    end
end



// Detecting ram_oe and ram_we being active at the same time
always @ (posedge WB_CLK_I)
begin
  if(tb_eth_top.ethtop.wishbone.ram_we & tb_eth_top.ethtop.wishbone.ram_oe)
    begin
      $display("\n\n(%0t)ERROR: ram_we and ram_oe both activated at the same time", $time);
      #1000;
      $stop;
    end
end




always @ (posedge WB_CLK_I)
  if(tb_eth_top.ethtop.wishbone.RxStatusWrite)
    $fdisplay(mcd2, "");  // newline added

task WishboneWrite;
  input [31:0] Data;
  input [31:0] Address;
  integer ii;

  begin
    wait (~WishboneBusy);
    WishboneBusy = 1;
    @ (posedge WB_CLK_I);
    #1;
    WB_ADR_I = Address;
    WB_DAT_I = Data;
    WB_WE_I  = 1'b1;
    WB_CYC_I = 1'b1;
    WB_STB_I = 1'b1;
    WB_SEL_I = 4'hf;


    wait(WB_ACK_O);   // waiting for acknowledge response

    // Writing information about the access to the screen
    @ (posedge WB_CLK_I);
    if(LogEnable)
    begin
      if(~Address[11] & ~Address[10])
        $write("\n(%0t) Write to register (Data: 0x%x, Reg. Addr: 0x%0x)", $time, Data, Address);
      else
      if(~Address[11] & Address[10])
        if(Address[9:2] < tb_eth_top.ethtop.r_TxBDNum)
          begin
            $write("\n(%0t) Write to TxBD (Data: 0x%x, TxBD Addr: 0x%0x)", $time, Data, Address);
            if(Address[9:2] == tb_eth_top.ethtop.r_TxBDNum-2'h2)
              $write("(%0t) Send Control packet\n", $time);
          end
        else
          $write("\n(%0t) Write to RxBD (Data: 0x%x, RxBD Addr: 0x%0x)", $time, Data, Address);
      else
        $write("\n(%0t) WB write ??????????????     Data: 0x%x      Addr: 0x%0x", $time, Data, Address);
    end
    
    #1;
    WB_ADR_I = 32'hx;
    WB_DAT_I = 32'hx;
    WB_WE_I  = 1'bx;
    WB_CYC_I = 1'b0;
    WB_STB_I = 1'b0;
    WB_SEL_I = 4'hx;
    #5 WishboneBusy = 0;
  end
endtask


task WishboneRead;
  input [31:0] Address;
  output[31:0] data;

  begin
    wait (~WishboneBusy);
    WishboneBusy = 1;
    @ (posedge WB_CLK_I);
    #1;
    WB_ADR_I = Address;
    WB_WE_I  = 1'b0;
    WB_CYC_I = 1'b1;
    WB_STB_I = 1'b1;
    WB_SEL_I = 4'hf;
    #3;
    wait(WB_ACK_O);   // waiting for acknowledge response
    @ (posedge WB_CLK_I);
      data = WB_DAT_O;
      if(~Address[11] & ~Address[10])
//        $write("\n(%0t) Read from register (Data: 0x%x, Reg. Addr: 0x%0x)", $time, WB_DAT_O, Address);
        $write("\n(%0t) Read from register (Data: 0x%x, Reg. Addr: 0x%0x)", $time, data, Address);
      else
      if(~Address[11] & Address[10])
        if(Address[9:2] < tb_eth_top.ethtop.r_TxBDNum)
//          ; //$write("\n(%0t) Read from TxBD (Data: 0x%x, TxBD Addr: 0x%0x)", $time, WB_DAT_O, Address);
          ; //$write("\n(%0t) Read from TxBD (Data: 0x%x, TxBD Addr: 0x%0x)", $time, data, Address);
        else
//          ;//$write("\n(%0t) Read from RxBD (Data: 0x%x, RxBD Addr: 0x%0x)", $time, WB_DAT_O, Address);
          ;//$write("\n(%0t) Read from RxBD (Data: 0x%x, RxBD Addr: 0x%0x)", $time, data, Address);
      else
//        $write("\n(%0t) WB read  ?????????    Data: 0x%x      Addr: 0x%0x", $time, WB_DAT_O, Address);
        $write("\n(%0t) WB read  ?????????    Data: 0x%x      Addr: 0x%0x", $time, data, Address);
    #1;
    WB_ADR_I = 32'hx;
    WB_WE_I  = 1'bx;
    WB_CYC_I = 1'b0;
    WB_STB_I = 1'b0;
    WB_SEL_I = 4'hx;
    #5 WishboneBusy = 0;
  end
endtask



task WishboneReadData;
  input [31:0] Address;
  output[31:0] data;

  begin
    @ (posedge WB_CLK_I);
    data = {memory3[Address], memory2[Address], memory1[Address], memory0[Address]};
    #5;
  end
endtask


task WishboneWriteData;
  input [31:0] Address;
  input [31:0] data;
  input [3:0]  Select;

  begin
    @ (posedge WB_CLK_I);
    if(Select[0])
      memory0[Address] = data[7:0];
    if(Select[1])
      memory1[Address] = data[15:8];
    if(Select[2])
      memory2[Address] = data[23:16];
    if(Select[3])
      memory3[Address] = data[31:24];
//    $display("\n(%0t) Write data to memory (Data: 0x%x, Addr: 0x%0x)", $time, data, Address);
    #5;
  end
endtask




task SendPacket;
  input [15:0]  Length;
  input         ControlFrame;
  reg           Wrap;
  reg [31:0]    TempAddr;
  reg [31:0]    TempData;
  reg [31:0]    kk;
  
  begin
//    if(TxBDIndex == 6)    // Only 3 buffer descriptors are used 
//      Wrap = 1'b1;
//    else
      Wrap = 1'b0;    // At the moment no wrap bit is set


    // Writing data to buffer
    for(kk=0; kk<Length; kk=kk+4)
    begin
      TempAddr = `TX_BUF_BASE + TxBDIndex * 32'h600 + kk;
      TempData = {kk[7:0], kk[7:0]+2'h1, kk[7:0]+2'h2, kk[7:0]+2'h3};
      WishboneWriteData(TempAddr, TempData, 4'hf); // Writing Data to buffer that is pointed by the BD
    end
    

    // Writing buffer pointer
    TempAddr = {22'h01, ((TxBDIndex*2'h2 + 1'b1)<<2)};
    TempData = `TX_BUF_BASE + TxBDIndex * 32'h600; // 1536 bytes is reserved for one frame
    WishboneWrite(TempData, TempAddr); // Writing Tx pointer

    TempAddr = {22'h01, ((TxBDIndex*2'h2)<<2)};
    TempData = {Length[15:0], 1'b1, 1'b0, Wrap, 3'h0, ControlFrame, 1'b0, TxBDIndex[7:0]};  // Ready and Wrap = 1

    #1;
//    if(TxBDIndex == 6)    // Only 4 buffer descriptors are used
//      TxBDIndex = 0;
//    else
      TxBDIndex = TxBDIndex + 1;

    WishboneWrite(TempData, TempAddr); // Writing status to TxBD
  end
endtask



task SendPacketX;
  input [15:0]  Length;
  input         ControlFrame;
  input  [1:0]  AddrOffset;
  reg           Wrap;
  reg [31:0]    TempAddr;
  reg [31:0]    TempData;
  reg [31:0]    kk;
  reg  [3:0]    Select;
  
  begin
    Wrap = 1'b0;

    case(AddrOffset)
      2'h0 : Select = 4'hf;
      2'h1 : Select = 4'h7;
      2'h2 : Select = 4'h3;
      2'h3 : Select = 4'h1;
    endcase

    // Writing data to buffer
    for(kk=0; kk<Length+4; kk=kk+4)   // Length+4 is because we might start up to 3 bytes later
    begin
      if(kk>0)
        Select = 4'hf;
      TempAddr = `TX_BUF_BASE + TxBDIndex * 32'h600 + kk;
      TempData = {kk[7:0]+3'h1, kk[7:0]+3'h2, kk[7:0]+3'h3, kk[7:0]+3'h4};
      WishboneWriteData(TempAddr, TempData, Select); // Writing Data to buffer that is pointed by the BD
    end
    

    // Writing buffer pointer
    TempAddr = {22'h01, ((TxBDIndex*2'h2 + 1'b1)<<2)};
    TempData = `TX_BUF_BASE + TxBDIndex * 32'h600 + AddrOffset; // 1536 bytes is reserved for one frame
    WishboneWrite(TempData, TempAddr); // Writing Tx pointer

    TempAddr = {22'h01, ((TxBDIndex*2'h2)<<2)};
    TempData = {Length[15:0], 1'b1, 1'b1, Wrap, 3'h0, ControlFrame, 1'b0, TxBDIndex[7:0]};  // Ready, interrupt and Wrap = 1

    #1;
    if(Wrap)
      TxBDIndex = 0;
    else
      TxBDIndex = TxBDIndex + 1;

    WishboneWrite(TempData, TempAddr); // Writing status to TxBD
  end
endtask


task send_packet;
  input [47:0] dest_addr;
  input [15:0] length;

  reg [31:0] BD, ptr;
  reg [31:0] i;
  reg [2:0]  increment;

  reg [31:0]    TempAddr;
  reg [31:0]    TempData;
  reg [15:0]    kk;
  reg  [3:0]    Select;
  
  begin
    bd_status_addr = `TX_BD_BASE + g_last_txbd * 8;

    mama
    WishboneRead(bd_status_addr, BD);           // Read BD
    WishboneRead(bd_status_addr+4, ptr);        // Read buffer pointer

    case(ptr[1:0])
      2'h0 : begin Select = 4'hf; increment = 3'h4 end
      2'h1 : begin Select = 4'h7; increment = 3'h3 end
      2'h2 : begin Select = 4'h3; increment = 3'h2 end
      2'h3 : begin Select = 4'h1; increment = 3'h1 end
    endcase

    // Writing data to buffer
    for(i=ptr; i<(length+ptr); i=i+increment)   // (i=0; i<length; i=i+increment)
    begin
      if(i>ptr)   // After first write all accesses are word accesses
        begin Select = 4'hf; increment=3'h4; end

      TempAddr = `TX_BUF_BASE + TxBDIndex * 32'h600 + kk;
      TempData = {i[7:0]+3'h1, i[7:0]+3'h2, i[7:0]+3'h3, i[7:0]+3'h4};
mama                 
      WishboneWriteData(TempAddr, TempData, Select); // Writing Data to buffer that is pointed by the BD
    end
    

    // Writing buffer pointer
    TempAddr = {22'h01, ((TxBDIndex*2'h2 + 1'b1)<<2)};
    TempData = `TX_BUF_BASE + TxBDIndex * 32'h600 + AddrOffset; // 1536 bytes is reserved for one frame
    WishboneWrite(TempData, TempAddr); // Writing Tx pointer

    TempAddr = {22'h01, ((TxBDIndex*2'h2)<<2)};
    TempData = {length[15:0], 1'b1, 1'b1, Wrap, 3'h0, ControlFrame, 1'b0, TxBDIndex[7:0]};  // Ready, interrupt and Wrap = 1

    #1;
    if(Wrap)
      TxBDIndex = 0;
    else
      TxBDIndex = TxBDIndex + 1;

    WishboneWrite(TempData, TempAddr); // Writing status to TxBD

    if(BD & 32'h2000)     // Wrap bit set ?
      g_last_txbd = 0;
    else
      g_last_txbd = g_last_txbd+1;

  end
endtask // send_packet


task ReceivePacket;    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  input [15:0] LengthRx;
  input        RxControlFrame;
  input [31:0] TransferType;  //Broadcast,Unicast,Multicast
  reg        WrapRx;
  reg [31:0] TempRxAddr;
//  reg [31:0] TempRxData;
  integer TempRxData;
  reg abc;
  begin
//    if(RxBDIndex == 6)    // Only 3 buffer descriptors are used
//      WrapRx = 1'b1;
//    else
      WrapRx = 1'b0;

    TempRxAddr = {22'h01, ((tb_eth_top.ethtop.r_TxBDNum + RxBDIndex*2'h2 + 1'b1)<<2)};
    TempRxData = `RX_BUF_BASE + RxBDIndex * 32'h600; // 1536 bytes is reserved for one frame
    WishboneWrite(TempRxData, TempRxAddr); // Writing Rx pointer

    TempRxAddr = {22'h01, ((tb_eth_top.ethtop.r_TxBDNum + RxBDIndex*2'h2)<<2)};
    TempRxData = {16'h0, 1'b1, 1'b0, WrapRx, 5'h0, RxBDIndex[7:0]};  // Ready and WrapRx = 1 or 0

    #1;
//    if(RxBDIndex == 6)    // Only 4 buffer descriptors are used
//      RxBDIndex = 0;
//    else
      RxBDIndex = RxBDIndex + 1;

    abc=1;
    WishboneWrite(TempRxData, TempRxAddr); // Writing status to RxBD
    abc=0;

      begin
        #200;
        if(RxControlFrame)
          GetControlDataOnMRxD(LengthRx); // LengthRx = PAUSE timer value.
        else
          GetDataOnMRxD(LengthRx, TransferType); // LengthRx bytes is comming on MRxD[3:0] signals
      end

  end
endtask


task ReceivePacketX;    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.
  input [15:0] LengthRx;
  input        RxControlFrame;
  input [31:0] TransferType;  //Broadcast,Unicast,Multicast
  input  [1:0]  AddrOffset;
  reg        WrapRx;
  reg [31:0] TempRxAddr;
  integer TempRxData;
  reg abc;
  begin
    WrapRx = 1'b0;

    TempRxAddr = {22'h01, ((tb_eth_top.ethtop.r_TxBDNum + RxBDIndex*2'h2 + 1'b1)<<2)};
    TempRxData = `RX_BUF_BASE + RxBDIndex * 32'h600 + AddrOffset; // 1536 bytes is reserved for one frame
    WishboneWrite(TempRxData, TempRxAddr); // Writing Rx pointer

    TempRxAddr = {22'h01, ((tb_eth_top.ethtop.r_TxBDNum + RxBDIndex*2'h2)<<2)};
    TempRxData = {16'h0, 1'b1, 1'b1, WrapRx, 5'h0, RxBDIndex[7:0]};  // Ready, interrupt and WrapRx = 1 or 0

    #1;
      RxBDIndex = RxBDIndex + 1;

    abc=1;
    WishboneWrite(TempRxData, TempRxAddr); // Writing status to RxBD
    abc=0;

      begin
        #200;
        if(RxControlFrame)
          GetControlDataOnMRxD(LengthRx); // LengthRx = PAUSE timer value.
        else
          GetDataOnMRxD(LengthRx, TransferType); // LengthRx bytes is comming on MRxD[3:0] signals
      end

  end
endtask


task GetDataOnMRxD;
  input [15:0] Len;
  input [31:0] TransferType;
  integer tt;

  begin
    @ (posedge MRxClk);
    MRxDV=1'b1;
    
    for(tt=0; tt<15; tt=tt+1)
    begin
      MRxD=4'h5;              // preamble
      @ (posedge MRxClk);
    end
    MRxD=4'hd;                // SFD
    
  for(tt=1; tt<(Len+1); tt=tt+1)
     
    begin
	
      @ (posedge MRxClk);
	  if(TransferType == `UNICAST_XFR && tt == 1)
	   MRxD= 4'h0;   // Unicast transfer
	  else if(TransferType == `BROADCAST_XFR && tt < 7)
	   MRxD = 4'hf;
	  else
       MRxD=tt[3:0]; // Multicast transfer

    @ (posedge MRxClk);
	  
	   if(TransferType == `BROADCAST_XFR && tt < 7)
	    MRxD = 4'hf;
	  else
        MRxD=tt[7:4];
    end

    @ (posedge MRxClk);
    MRxDV=1'b0;
  end
endtask


task GetControlDataOnMRxD;
  input [15:0] Timer;
  reg [127:0] Packet;
  reg [127:0] Data;
  reg [31:0] Crc;
  integer tt;

  begin
  Packet = 128'h10082C000010_deadbeef0013_8880_0010; // 0180c2000001 + 8808 + 0001
  Crc = 32'h6014fe08; // not a correct value
  
    @ (posedge MRxClk);
    MRxDV=1'b1;
    
    for(tt=0; tt<15; tt=tt+1)
    begin
      MRxD=4'h5;              // preamble
      @ (posedge MRxClk);
    end
    MRxD=4'hd;                // SFD
    
    for(tt=0; tt<32; tt=tt+1)
    begin
      Data = Packet << (tt*4);
      @ (posedge MRxClk);
      MRxD=Data[127:124];
    end
    
    for(tt=0; tt<2; tt=tt+1)    // timer
    begin
      Data[15:0] = Timer << (tt*8);
      @ (posedge MRxClk);
      MRxD=Data[11:8];
      @ (posedge MRxClk);
      MRxD=Data[15:12];
    end
    
    for(tt=0; tt<42; tt=tt+1)   // padding
    begin
      Data[7:0] = 8'h0;
      @ (posedge MRxClk);
      MRxD=Data[3:0];
      @ (posedge MRxClk);
      MRxD=Data[3:0];
    end
    
    for(tt=0; tt<4; tt=tt+1)    // crc
    begin
      Data[31:0] = Crc << (tt*8);
      @ (posedge MRxClk);
      MRxD=Data[27:24];
      @ (posedge MRxClk);
      MRxD=Data[31:28];
    end
    
    
    
    @ (posedge MRxClk);
    MRxDV=1'b0;
  end
endtask

task InitializeMemory;
  reg [9:0] mem_addr;
  
  begin
    LogEnable = 1'b0;
    $display("\n\n(%0t) Initializing Memory...", $time);
    for(mem_addr=0; mem_addr<=10'h0ff; mem_addr=mem_addr+1'b1)
      WishboneWrite(32'h0, {22'h01, mem_addr<<2}); // Writing status to RxBD
    LogEnable = 1'b1;
  end
endtask




endmodule
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