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

////                                                              ////

////  tb_eth_top.v                                                ////

////                                                              ////

////  This file is part of the Ethernet IP core project           ////

////  http://www.opencores.org/cores/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 1.2  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 "eth_defines.v"

`include "eth_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;

reg    [1:0]  WB_ACK_I;

wire  [31:0]  WB_DAT_O;

wire          WB_ACK_O;

wire          WB_ERR_O;

wire   [1:0]  WB_REQ_O;

wire   [1:0]  WB_ND_O;

wire          WB_RD_O;

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 GSR;

reg WishboneBusy;

reg StartTB;

reg [9:0] TxBDIndex;

reg [9:0] RxBDIndex;

// 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), .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), .wb_req_o(WB_REQ_O),

        .wb_ack_i(WB_ACK_I), .wb_nd_o(WB_ND_O),   .wb_rd_o(WB_RD_O),

  //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_padoen_o(Mdo_OE)

);

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;

  WB_ACK_I  =  2'h0;

  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;

end

// Reset pulse

initial

begin

  GSR           =  1'b1;

  WB_RST_I      =  1'b1;

  #100 WB_RST_I =  1'b1;

  GSR           =  1'b1;

  #100 WB_RST_I =  1'b0;

  GSR           =  1'b0;

  #100 StartTB  =  1'b1;

end

assign glbl.GSR = GSR;

// Generating WB_CLK_I clock

always

begin

//  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 #15 WB_CLK_I = ~WB_CLK_I;  // 2*10 ns -> 33.3 MHz    

//  forever #18 WB_CLK_I = ~WB_CLK_I;  // 2*18 ns -> 27.7 MHz    

//  forever #100 WB_CLK_I = ~WB_CLK_I;

end

// Generating MTxClk clock

always

begin

  #3 forever #20 MTxClk = ~MTxClk;   // 2*20 ns -> 25 MHz

//  #3 forever #200 MTxClk = ~MTxClk;

end

// Generating MRxClk clock

always

begin

  #16 forever #20 MRxClk = ~MRxClk;   // 2*20 ns -> 25 MHz

//  #16 forever #250 MRxClk = ~MRxClk;

end

initial

begin

  wait(StartTB);  // Start of testbench

  WishboneWrite(32'h00000800, {`ETH_ETHERNET_SPACE, `ETH_REG_SPACE, 6'h0, `ETH_MODER_ADR<<2});    // r_Rst = 1

  WishboneWrite(32'h00000000, {`ETH_ETHERNET_SPACE, `ETH_REG_SPACE, 6'h0, `ETH_MODER_ADR<<2});    // r_Rst = 0

  WishboneWrite(32'h00000080, {`ETH_ETHERNET_SPACE, `ETH_REG_SPACE, 6'h0, `ETH_RX_BD_ADR_ADR<<2});// r_RxBDAddress = 0x80

  WishboneWrite(32'h0002A443, {`ETH_ETHERNET_SPACE, `ETH_REG_SPACE, 6'h0, `ETH_MODER_ADR<<2});    // RxEn, Txen, FullD, CrcEn, Pad, DmaEn, r_IFG

  WishboneWrite(32'h00000004, {`ETH_ETHERNET_SPACE, `ETH_REG_SPACE, 6'h0, `ETH_CTRLMODER_ADR<<2});//r_TxFlow = 1

  SendPacket(16'h0015, 1'b0);

  SendPacket(16'h0043, 1'b1);   // Control frame

  SendPacket(16'h0025, 1'b0);

  SendPacket(16'h0045, 1'b0);

  SendPacket(16'h0025, 1'b0);

  ReceivePacket(16'h0012, 1'b1);    // Initializes RxBD and then Sends a control packet on the MRxD[3:0] signals.

  ReceivePacket(16'h0011, 1'b0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  ReceivePacket(16'h0016, 1'b0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  ReceivePacket(16'h0017, 1'b0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  ReceivePacket(16'h0018, 1'b0);    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_REG_SPACE, 6'h0, `ETH_MODER_ADR<<2});   // Read from MODER register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h0<<2)});       // Read from TxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h1<<2)});       // Read from TxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h2<<2)});       // Read from TxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h3<<2)});       // Read from TxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h4<<2)});       // Read from TxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h80<<2)});       // Read from RxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h81<<2)});       // Read from RxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h82<<2)});       // Read from RxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h83<<2)});       // Read from RxBD register

  WishboneRead({`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (10'h84<<2)});       // Read from RxBD register

  #10000 $stop;

end

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;

//    for(ii=0; (ii<20 & ~WB_ACK_O); ii=ii+1)   // Response on the WISHBONE is limited to 20 WB_CLK_I cycles

//    begin

//      @ (posedge WB_CLK_I);

//    end

//    if(ii==20)

//      begin

//        $display("\nERROR: Task WishboneWrite(Data=0x%0h, Address=0x%0h): Too late or no appeariance of the WB_ACK_O signal, (Time=%0t)", 

//          Data, Address, $time);

//        #50 $stop;

//      end

    wait(WB_ACK_O);   // waiting for acknowledge response

    // Writing information about the access to the screen

    @ (posedge WB_CLK_I);

    if(Address[31:16] == `ETH_ETHERNET_SPACE)

      if(Address[15:12] == `ETH_REG_SPACE)

        $write("\nWrite to register (Data: 0x%x, Reg. Addr: 0x%0x)", Data, Address[9:2]);

      else

      if(Address[15:12] == `ETH_BD_SPACE)

        if(Address[9:2] < tb_eth_top.ethtop.r_RxBDAddress)

          begin

            $write("\nWrite to TxBD (Data: 0x%x, TxBD Addr: 0x%0x)\n", Data, Address[9:2]);

            if(Data[13])

              $write("Send Control packet (PAUSE = 0x%0h)\n", Data[31:16]);

          end

        else

          $write("\nWrite to RxBD (Data: 0x%x, RxBD Addr: 0x%0x)", Data, Address[9:2]);

      else

        $write("\nWB write      Data: 0x%x      Addr: 0x%0x", Data, Address);

    else

      $write("\nWARNING !!! WB write to non-ethernet space (Data: 0x%x, Addr: 0x%0x)", Data, Address);

    #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;

  reg   [31:0] Data;

  integer ii;

  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;

    for(ii=0; (ii<20 & ~WB_ACK_O); ii=ii+1)   // Response on the WISHBONE is limited to 20 WB_CLK_I cycles

    begin

      @ (posedge WB_CLK_I);

      Data = WB_DAT_O;

    end

    if(ii==20)

      begin

        $display("\nERROR: Task WishboneRead(Address=0x%0h): Too late or no appeariance of the WB_ACK_O signal, (Time=%0t)",

          Address, $time);

        #50 $stop;

      end

    @ (posedge WB_CLK_I);

    if(Address[31:16] == `ETH_ETHERNET_SPACE)

      if(Address[15:12] == `ETH_REG_SPACE)

        $write("\nRead from register (Data: 0x%x, Reg. Addr: 0x%0x)", Data, Address[9:2]);

      else

      if(Address[15:12] == `ETH_BD_SPACE)

        if(Address[9:2] < tb_eth_top.ethtop.r_RxBDAddress)

          begin

            $write("\nRead from TxBD (Data: 0x%x, TxBD Addr: 0x%0x)", Data, Address[9:2]);

          end

        else

          $write("\nRead from RxBD (Data: 0x%x, RxBD Addr: 0x%0x)", Data, Address[9:2]);

      else

        $write("\nWB read      Data: 0x%x      Addr: 0x%0x", Data, Address);

    else

      $write("\nWARNING !!! WB read to non-ethernet space (Data: 0x%x, Addr: 0x%0x)", 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 SendPacket;

  input [15:0]  Length;

  input         ControlFrame;

  reg           Wrap;

  reg [31:0]    TempAddr;

  reg [31:0]    TempData;

  begin

    if(TxBDIndex == 3)    // Only 4 buffer descriptors are used

      Wrap = 1'b1;

    else

      Wrap = 1'b0;

    TempAddr = {`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, (TxBDIndex<<2)};

    TempData = {Length[15:0], 1'b1, Wrap, ControlFrame, 5'h0, TxBDIndex[7:0]};  // Ready and Wrap = 1

    #1;

    if(TxBDIndex == 3)    // Only 4 buffer descriptors are used

      TxBDIndex = 0;

    else

      TxBDIndex = TxBDIndex + 1;

    fork

      begin

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

      end

      begin

        if(~ControlFrame)

        WaitingForTxDMARequest(4'h1, Length); // Delay, DMALength

      end

    join

  end

endtask

task ReceivePacket;    // Initializes RxBD and then generates traffic on the MRxD[3:0] signals.

  input [15:0] LengthRx;

  input        RxControlFrame;

  reg        WrapRx;

  reg [31:0] TempRxAddr;

  reg [31:0] TempRxData;

  reg abc;

  begin

    if(RxBDIndex == 3)    // Only 4 buffer descriptors are used

      WrapRx = 1'b1;

    else

      WrapRx = 1'b0;

    TempRxAddr = {`ETH_ETHERNET_SPACE, `ETH_BD_SPACE, 2'h0, ((tb_eth_top.ethtop.r_RxBDAddress + RxBDIndex)<<2)};

    TempRxData = {LengthRx[15:0], 1'b1, WrapRx, 6'h0, RxBDIndex[7:0]};  // Ready and WrapRx = 1 or 0

    #1;

    if(RxBDIndex == 3)    // Only 4 buffer descriptors are used

      RxBDIndex = 0;

    else

      RxBDIndex = RxBDIndex + 1;

    abc=1;

    WishboneWrite(TempRxData, TempRxAddr); // Writing status to RxBD

    abc=0;

    fork

      begin

        #200;

        if(RxControlFrame)

          GetControlDataOnMRxD(LengthRx); // LengthRx = PAUSE timer value.

        else

          GetDataOnMRxD(LengthRx); // LengthRx bytes is comming on MRxD[3:0] signals

      end

      begin

        if(RxControlFrame)

          WaitingForRxDMARequest(4'h1, 16'h40); // Delay, DMALength = 64 bytes.

        else

          WaitingForRxDMARequest(4'h1, LengthRx); // Delay, DMALength

      end

    join

  end

endtask

task WaitingForTxDMARequest;

  input [3:0] Delay;

  input [15:0] DMALength;

  integer pp;

  reg [7:0]a, b, c, d;

  for(pp=0; pp*4<DMALength; pp=pp+1)

  begin

    a = 4*pp[7:0]+3;

    b = 4*pp[7:0]+2;

    c = 4*pp[7:0]+1;

    d = 4*pp[7:0]  ;

    @ (posedge WB_REQ_O[0]);

    repeat(Delay) @(posedge WB_CLK_I);

    wait (~WishboneBusy);

    WishboneBusy = 1;

    #1;

    WB_DAT_I = {a, b, c, d};

    WB_ADR_I = {`ETH_ETHERNET_SPACE, `ETH_TX_DATA, pp[11:0]};

    $display("task WaitingForTxDMARequest: pp=%0d, WB_ADR_I=0x%0h, WB_DAT_I=0x%0h", pp, WB_ADR_I, WB_DAT_I);

    WB_WE_I  = 1'b1;

    WB_CYC_I = 1'b1;

    WB_STB_I = 1'b1;

    WB_SEL_I = 4'hf;

    WB_ACK_I[0] = 1'b1;

    @ (posedge WB_CLK_I);

    #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;

    WB_ACK_I[0] = 1'b0;

    #5 WishboneBusy = 0;

  end

endtask

task WaitingForRxDMARequest;

  input [3:0] Delay;

  input [15:0] DMALengthRx;

  integer rr;

  for(rr=0; rr*4<DMALengthRx; rr=rr+1)

  begin

    @ (posedge WB_REQ_O[1]);

    repeat(Delay) @(posedge WB_CLK_I);

    wait (~WishboneBusy);

    WishboneBusy = 1;

    #1;

    WB_ADR_I = {`ETH_ETHERNET_SPACE, `ETH_RX_DATA, rr[11:0]};

    $display("task WaitingForRxDMARequest: rr=%0d, WB_ADR_I=0x%0h, WB_DAT_O=0x%0h", rr, WB_ADR_I, WB_DAT_O);

    WB_WE_I  = 1'b1;

    WB_CYC_I = 1'b1;

    WB_STB_I = 1'b1;

    WB_SEL_I = 4'hf;

    WB_ACK_I[1] = 1'b1;

    @ (posedge WB_CLK_I);

    #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;

    WB_ACK_I[1] = 1'b0;

    #5 WishboneBusy = 0;

  end

endtask

task GetDataOnMRxD;

  input [15:0] Len;

  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=0; tt<Len; tt=tt+1)

    begin

      @ (posedge MRxClk);

      MRxD=tt[3:0];

      @ (posedge MRxClk);

      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