Subversion Repositories pcie_sg_dma

`timescale 1ns / 1ps

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

// Company:  ziti, Uni. HD

// Engineer:  wgao

//            weng.ziti@gmail.com

// 

// Create Date:   16:54:18 04 Nov 2008

// Design Name:   tlpControl

// Module Name:   tf64_pcie_trn.v

// Project Name:  PCIE_SG_DMA

// Target Device:  

// Tool versions:  

// Description:  PIO and DMA are both simulated.

//

// Verilog Test Fixture created by ISE for module: tlpControl

//

// Dependencies:

// 

// Revision:

// Revision 0.01 - File Created

// 

// Revision 1.00 - Released to OpenCores.org   14.09.2011

// 

// Additional Comments:

// 

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

//`define  RANDOM_SEQUENCE

  /*  Time parameters  */

`define  T_HALF_CYCLE_CLK                   4.0

`define  T_HALF_CYCLE_MEMCLK                5.0

`define  T_DELAY_AFTER                      0.0

`define  T_DELTA                            0.1

`define  T_PIO_INTERVAL                    50.0

`define  T_DMA_INTERVAL                   300.0

//`define  T_DMA_TURN_AROUND                100.0

//`define  T_STATISTIC_INTERVAL           10000.0

`define  T_RX_NO_FC_PERIOD            1900000.0

`define  T_TX_NO_FC_PERIOD            1500000.0

  /* Memory size for simulation */

`define  C_ARRAY_DIMENSION              4096

  /* Start indices */

`define  PIO_START_INDEX                'H0300

`define  DMA_START_INDEX                'H0000

  /* Request completion boundary */

`define  C_RCB_16_DW                    'H10

`define  C_RCB_32_DW                    'H20

  /* BAR */

`define  C_BAR0_HIT                    7'H7E

`define  C_BAR1_HIT                    7'H7D

`define  C_BAR2_HIT                    7'H7B

`define  C_BAR3_HIT                    7'H77

`define  C_BAR4_HIT                    7'H6F

`define  C_BAR5_HIT                    7'H5F

`define  C_BAR6_HIT                    7'H3F

`define  C_NO_BAR_HIT                  7'H7F

  /* Requester ID and Completer ID */

`define  C_HOST_WRREQ_ID              16'H0ABC

`define  C_HOST_RDREQ_ID              16'HE1E2

`define  C_HOST_CPLD_ID               16'HC01D

  /* 1st header */

`define  HEADER0_MWR3_                32'H40000000

`define  HEADER0_MWR4_                32'H60000000

`define  HEADER0_MRD3_                32'H00000000

`define  HEADER0_MRD4_                32'H20000000

`define  HEADER0_CPLD                 32'H4A000000

`define  HEADER0_CPL                  32'H0A000000

`define  HEADER0_MSG                  32'H34000001

  /* Message codes */

`define  C_MSG_CODE_INTA               8'H20

`define  C_MSG_CODE_INTA_N             8'H24

  /* Payload type */

`define  USE_PRIVATE                    1

`define  USE_PUBLIC                     0

  /* General registers */

`define  C_ADDR_VERSION                 32'H0000

`define  C_ADDR_IRQ_STAT                32'H0008

`define  C_ADDR_IRQ_EN                  32'H0010

`define  C_ADDR_GSR                     32'H0020

`define  C_ADDR_GCR                     32'H0028

  /* Control registers for special ports */

`define  C_ADDR_MRD_CTRL                32'H0074

`define  C_ADDR_TX_CTRL                 32'H0078

`define  C_ADDR_ICAP                    32'H007C

`define  C_ADDR_EB_STACON               32'H0090

  /* Downstream DMA channel registers */

`define  C_ADDR_DMA_DS_PAH              32'H0050

`define  C_ADDR_DMA_DS_CTRL             32'H006C

`define  C_ADDR_DMA_DS_STA              32'H0070

  /* Upstream DMA channel registers */

`define  C_ADDR_DMA_US_PAH              32'H002C

`define  C_ADDR_DMA_US_CTRL             32'H0048

`define  C_ADDR_DMA_US_STA              32'H004C

  /* DMA-specific constants */

`define  C_DMA_RST_CMD                  32'H0200000A

module tf64_pcie_trn();

   // Inputs

   reg  trn_reset_n;

   reg  trn_lnk_up_n;

   reg  trn_clk;

   reg  trn_rsof_n;

   reg  trn_reof_n;

   reg  [63:0] trn_rd;

   reg  [7:0] trn_rrem_n;

   reg  trn_rsrc_rdy_n;

   wire trn_rdst_rdy_n;

   reg  [6:0] trn_rbar_hit_n;

   wire trn_rnp_ok_n;

   reg  trn_rerrfwd_n;

   reg  trn_rsrc_dsc_n;

   wire trn_tsof_n;

   wire trn_teof_n;

   wire [63:0] trn_td;

   wire [7:0] trn_trem_n;

   wire trn_tsrc_rdy_n;

   reg  trn_tdst_rdy_n;

   wire trn_terrfwd_n;

   wire trn_tsrc_dsc_n;

   reg  trn_tdst_dsc_n;

   reg  [3:0] trn_tbuf_av;

//   reg cfg_interrupt_rdy_n;

//   reg [2:0] cfg_interrupt_mmenable;

//   reg cfg_interrupt_msienable;

//   reg [7:0] cfg_interrupt_do;

   reg [5:0] pcie_link_width;

   reg [15:0] cfg_dcommand;

   reg [15:0] localID;

   // Outputs

   wire DDR_wr_v;

   wire DDR_wr_sof;

   wire DDR_wr_eof;

   wire DDR_wr_Shift;

   wire [1:0] DDR_wr_Mask;

   wire [63:0] DDR_wr_din;

   wire DDR_wr_full;

   wire DDR_rdc_v;

   wire DDR_rdc_sof;

   wire DDR_rdc_eof;

   wire DDR_rdc_Shift;

   wire [63:0] DDR_rdc_din;

   wire DDR_rdc_full;

   wire DDR_FIFO_RdEn;

   wire DDR_FIFO_Empty;

   wire [63:0] DDR_FIFO_RdQout;

   reg  mbuf_UserFull;

   wire DDR_Ready;

   wire trn_Blinker;

   reg  mem_clk;

   // FIFO

   wire           eb_FIFO_we;

   wire [64-1:00] eb_FIFO_din;

   wire           eb_FIFO_re;

   wire [72-1:00] eb_FIFO_qout;

   wire [64-1:00] eb_FIFO_Status;

   wire           eb_FIFO_Rst;

   wire           eb_pfull;

   wire           eb_full;

   wire           eb_pempty;

   wire           eb_empty;

   wire [27-1:0]  eb_FIFO_Data_Count;

   // flow control toggles

   reg            Rx_No_Flow_Control;

   reg            Tx_No_Flow_Control;

   // message counters 

   reg  [31:00] Accum_Msg_INTA        = 0;

   reg  [31:00] Accum_Msg_INTA_n      = 0;

   // random seed

   reg [127: 0]  Op_Random;

   // Generated Array

   reg [15:00]  ii;

   reg [31:00]  D_Array[`C_ARRAY_DIMENSION-1:00];

   //

   reg  [ 7: 0] FSM_Trn;

   reg  [31: 0] Hdr_Array[3:0];

   reg  [31: 0] Private_Array[15:0];

   reg  [10: 0] Rx_TLP_Length;

   reg  [ 7: 0] Rx_MWr_Tag;

   reg  [ 4: 0] Rx_MRd_Tag;

   reg  [31:00] Tx_MRd_Addr;

   reg  [31:00] Tx_MRd_Leng;

   reg  [10: 0] tx_MRd_Length;

   reg  [ 7: 0] tx_MRd_Tag;

   reg  [ 7: 0] tx_MRd_Tag_k;

   reg  [31:00] DMA_PA;

   reg  [63:00] DMA_HA;

   reg  [63:00] DMA_BDA;

   reg  [31:00] DMA_Leng;

   reg  [31:00] DMA_L1;

   reg  [31:00] DMA_L2;

   reg  [02:00] DMA_bar;

   reg          DMA_ds_is_Last;

   reg          DMA_us_is_Last;

   reg  [31:00] CplD_Index;

   reg          Desc_tx_MRd_Valid;

   reg  [10:00] Desc_tx_MRd_Leng;

   reg  [31:00] Desc_tx_MRd_Addr;

   reg  [07:00] Desc_tx_MRd_TAG;

   reg          tx_MRd_come;

   reg  [63:00] PIO_Addr;

   reg  [31:00] PIO_Leng;

   reg  [ 3:00] PIO_1st_BE;

   reg  [ 6:00] PIO_bar;

   //

   wire           DBG_dma_start;

        // Instantiate the Unit Under Test (UUT)

        tlpControl uut (

                .mbuf_UserFull(mbuf_UserFull),

                .trn_Blinker(trn_Blinker),

      .eb_FIFO_we     (eb_FIFO_we    ) , //          : OUT std_logic; 

      .eb_FIFO_din    (eb_FIFO_din   ) , //          : OUT std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      .eb_FIFO_re     (eb_FIFO_re    ) , //          : OUT std_logic; 

      .eb_FIFO_empty  (eb_empty      ) , //          : IN  std_logic; 

      .eb_FIFO_qout   (eb_FIFO_qout[63:0]  ) , //          : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      .eb_FIFO_Data_Count   (eb_FIFO_Data_Count  ) , //          : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      .eb_FIFO_Status (eb_FIFO_Status) , //          : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      .eb_FIFO_Rst    (eb_FIFO_Rst   ) , //          : OUT std_logic;

      .Link_Buf_full  (eb_pfull   ) ,

      .DMA_ds_Start   (DBG_dma_start),

                .DDR_Ready      (DDR_Ready),

                .DDR_wr_sof(DDR_wr_sof),

                .DDR_wr_eof(DDR_wr_eof),

                .DDR_wr_v(DDR_wr_v),

                .DDR_wr_FA(   ),

                .DDR_wr_Shift(DDR_wr_Shift),

                .DDR_wr_Mask(DDR_wr_Mask),

                .DDR_wr_din(DDR_wr_din),

                .DDR_wr_full(DDR_wr_full),

                .DDR_rdc_sof(DDR_rdc_sof),

                .DDR_rdc_eof(DDR_rdc_eof),

                .DDR_rdc_v(DDR_rdc_v),

                .DDR_rdc_FA(   ),

      .DDR_rdc_Shift(DDR_rdc_Shift),

                .DDR_rdc_din(DDR_rdc_din),

                .DDR_rdc_full(DDR_rdc_full),

                .DDR_FIFO_RdEn(DDR_FIFO_RdEn),

                .DDR_FIFO_Empty(DDR_FIFO_Empty),

                .DDR_FIFO_RdQout(DDR_FIFO_RdQout),

                .trn_clk(trn_clk),

                .trn_reset_n(trn_reset_n),

                .trn_lnk_up_n(trn_lnk_up_n),

                .trn_rsof_n(trn_rsof_n),

                .trn_reof_n(trn_reof_n),

                .trn_rd(trn_rd),

      .trn_rrem_n(trn_rrem_n),

                .trn_rerrfwd_n(trn_rerrfwd_n),

                .trn_rsrc_rdy_n(trn_rsrc_rdy_n),

                .trn_rdst_rdy_n(trn_rdst_rdy_n),

                .trn_rnp_ok_n(trn_rnp_ok_n),

                .trn_rsrc_dsc_n(trn_rsrc_dsc_n),

                .trn_rbar_hit_n(trn_rbar_hit_n),

                .trn_tsof_n(trn_tsof_n),

                .trn_teof_n(trn_teof_n),

                .trn_td(trn_td),

      .trn_trem_n(trn_trem_n),

                .trn_terrfwd_n(trn_terrfwd_n),

                .trn_tsrc_rdy_n(trn_tsrc_rdy_n),

                .trn_tdst_rdy_n(trn_tdst_rdy_n),

                .trn_tsrc_dsc_n(trn_tsrc_dsc_n),

                .trn_tdst_dsc_n(trn_tdst_dsc_n),

                .trn_tbuf_av(trn_tbuf_av),

//              .cfg_interrupt_n(cfg_interrupt_n), 

//              .cfg_interrupt_rdy_n(cfg_interrupt_rdy_n), 

//              .cfg_interrupt_mmenable(cfg_interrupt_mmenable), 

//              .cfg_interrupt_msienable(cfg_interrupt_msienable), 

//              .cfg_interrupt_di(cfg_interrupt_di), 

//              .cfg_interrupt_do(cfg_interrupt_do), 

//              .cfg_interrupt_assert_n(cfg_interrupt_assert_n), 

                .pcie_link_width(pcie_link_width),

                .cfg_dcommand(cfg_dcommand),

                .localID(localID)

        );

        // Instantiate the BRAM module

   bram_Control

   bram_controller(

    .DDR_wr_sof(DDR_wr_sof),

    .DDR_wr_eof(DDR_wr_eof),

    .DDR_wr_v(DDR_wr_v),

    .DDR_wr_FA(1'b0),

    .DDR_wr_Shift(DDR_wr_Shift),

    .DDR_wr_Mask(DDR_wr_Mask),

    .DDR_wr_din(DDR_wr_din),

//    .DDR_wr_full(DDR_wr_full), 

    .DDR_rdc_sof(DDR_rdc_sof),

    .DDR_rdc_eof(DDR_rdc_eof),

    .DDR_rdc_v(DDR_rdc_v),

    .DDR_rdc_FA(1'b0),

    .DDR_rdc_Shift(DDR_rdc_Shift),

    .DDR_rdc_din(DDR_rdc_din),

    .DDR_rdc_full(DDR_rdc_full),

    .DDR_FIFO_RdEn(DDR_FIFO_RdEn),

    .DDR_FIFO_Empty(DDR_FIFO_Empty),

    .DDR_FIFO_RdQout(DDR_FIFO_RdQout),

    .DBG_dma_start(DBG_dma_start),

    .DDR_Ready(DDR_Ready),

    .DDR_blinker(DDR_blinker),

    .Sim_Zeichen(Sim_Zeichen),

    .mem_clk(mem_clk),

    .trn_clk(trn_clk),

    .trn_reset_n(trn_reset_n)

    );

   assign  DDR_wr_full = 0;

        // Instantiate the FIFO module

   FIFO_wrapper

   queue_buffer(

         .wr_clk     (  trn_clk        ),

         .wr_en      (  eb_FIFO_we     ),

         .din        (  {8'H0, eb_FIFO_din}    ),

         .pfull      (  eb_pfull       ),

         .full       (  eb_full        ),

         .rd_clk     (  trn_clk        ),

         .rd_en      (  eb_FIFO_re     ),

         .dout       (  eb_FIFO_qout   ),

         .pempty     (  eb_pempty      ),

         .empty      (  eb_empty       ),

         .data_count (  eb_FIFO_Data_Count[14:1]),

         .rst        (  eb_FIFO_Rst    )

         );

   assign  eb_FIFO_Data_Count[26:15] = 0;

   assign  eb_FIFO_Data_Count[0] = 0;

   assign  eb_FIFO_Status = {34'H0, eb_FIFO_Data_Count, eb_pfull, eb_empty};

   // initialiation

        initial begin

                // Initialize Inputs

                trn_clk = 0;

      mem_clk = 1;

                trn_reset_n = 0;

                trn_lnk_up_n = 1;

                trn_rerrfwd_n = 1;

                trn_rsrc_dsc_n = 1;

                trn_tdst_dsc_n = 1;

                trn_tbuf_av = -1;

//              cfg_interrupt_rdy_n = 0;

//              cfg_interrupt_mmenable = 0;

//              cfg_interrupt_msienable = 0;

//              cfg_interrupt_do = 0;

                mbuf_UserFull = 0;

                pcie_link_width = 'H19;

      cfg_dcommand = 'H2000;

                localID = 'HD841;

      Rx_No_Flow_Control = 0;

      Tx_No_Flow_Control = 0;

                // Wait some nanoseconds for global reset to finish

                #100;

                trn_reset_n = 1;

                trn_lnk_up_n = 0;

                #10000;

//      $stop();

        end

   // trn_clk toggles

   always #`T_HALF_CYCLE_CLK

   trn_clk = ~trn_clk;

   // mem_clk toggles

   always #`T_HALF_CYCLE_MEMCLK

   mem_clk = ~mem_clk;

   // Randoms generated for process flow

   always @(posedge trn_clk) begin

     Op_Random[ 31:00] = $random();

     Op_Random[ 63:32] = $random();

     Op_Random[ 95:64] = $random();

     Op_Random[127:96] = $random();

   end

   /// Rx Flow Control

   always # `T_RX_NO_FC_PERIOD

   Rx_No_Flow_Control = ~Rx_No_Flow_Control;

   /// Tx Flow Control

   always # `T_TX_NO_FC_PERIOD

   Tx_No_Flow_Control = ~Tx_No_Flow_Control;

   // Signal prepared for trn_rsrc_rdy_n

   reg trn_rsrc_rdy_n_seed;

   always @(posedge trn_clk) begin

     trn_rsrc_rdy_n_seed <= Op_Random[8] & Op_Random[10] & ~Rx_No_Flow_Control;

   end

   // trn_tdst_rdy_n

   always @(posedge trn_clk )

   begin

     # `T_DELAY_AFTER

      trn_tdst_rdy_n <= (Op_Random[24] & Op_Random[21] & ~Tx_No_Flow_Control) | ~trn_reset_n;

   end

   // Initialization mem in host

   initial begin

     for (ii = 0; ii< `C_ARRAY_DIMENSION; ii= ii+1) begin

`ifdef  RANDOM_SEQUENCE

        D_Array[ii]    <= $random ();

`else

        D_Array[ii]    <= Inv_Endian ('H8760_0000 + ii + 1);

`endif

     end

   end

  //  Simulation procedure

  initial begin

    // Simulation Initialization

    FSM_Trn               <= 'H00;

    Gap_Insert_Rx;

    PIO_bar               <= -1;

    DMA_bar               <= 'H1;

    Rx_MWr_Tag            <= 'H80;

    Rx_MRd_Tag            <= 'H20;

    // Initialization: TLP

    # 400

      Rx_TLP_Length    <= 'H01;

    # `T_DELTA    // reset TX module

      Hdr_Array[0] <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

      Hdr_Array[1] <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, 4'Hf};

      Hdr_Array[2] <= `C_ADDR_TX_CTRL;

      Private_Array[0] <= 'H0000000A;

    # `T_DELTA

      TLP_Feed_Rx(`USE_PRIVATE, 'H0, `C_BAR0_HIT);

      Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

      Gap_Insert_Rx;

    # `T_DELTA     // Test MRd with 4-DW header  BAR[0]

      Hdr_Array[0] <= `HEADER0_MRD4_ | Rx_TLP_Length[9:0];

      Hdr_Array[1] <= {`C_HOST_RDREQ_ID, 8'HA1, 4'Hf, 4'Hf};

      Hdr_Array[2] <= -1;

      Hdr_Array[3] <= `C_ADDR_VERSION;

    # `T_DELTA

      TLP_Feed_Rx(`USE_PRIVATE, 'H0, `C_BAR0_HIT);

      Gap_Insert_Rx;

    # 100

      Rx_TLP_Length    <= 'H01;

    # `T_DELTA    // reset upstream DMA channel

      Hdr_Array[0] <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

      Hdr_Array[1] <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, 4'Hf};

      Hdr_Array[2] <= `C_ADDR_DMA_US_CTRL;

      Private_Array[0] <= `C_DMA_RST_CMD;

    # `T_DELTA

      TLP_Feed_Rx(`USE_PRIVATE, 'H0, `C_BAR0_HIT);

      Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

      Gap_Insert_Rx;

    # `T_DELTA    // reset downstream DMA channel

      Hdr_Array[0] <= `HEADER0_MWR4_ | Rx_TLP_Length[9:0];

      Hdr_Array[1] <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, 4'Hf};

      Hdr_Array[2] <= -1;

      Hdr_Array[3] <= `C_ADDR_DMA_DS_CTRL;

      Private_Array[0] <= `C_DMA_RST_CMD;

    # `T_DELTA

      TLP_Feed_Rx(`USE_PRIVATE, 'H0, `C_BAR0_HIT);

      Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

      Gap_Insert_Rx;

    # `T_DELTA    // reset Event Buffer FIFO

      Hdr_Array[0] <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

      Hdr_Array[1] <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, 4'Hf};

      Hdr_Array[2] <= `C_ADDR_EB_STACON;

      Private_Array[0] <= 'H0000000A;

    # `T_DELTA

      TLP_Feed_Rx(`USE_PRIVATE, 'H0, `C_BAR0_HIT);

      Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

      Gap_Insert_Rx;

    # `T_DELTA    // Enable INTerrupts

      Hdr_Array[0] <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

      Hdr_Array[1] <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, 4'Hf};

      Hdr_Array[2] <= `C_ADDR_IRQ_EN;

      Private_Array[0] <= 'H0000_0003;

    # `T_DELTA

      TLP_Feed_Rx(`USE_PRIVATE, 'H0, `C_BAR0_HIT);

      Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

      Gap_Insert_Rx;

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

    //                       PIO simulation                            //

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

     # `T_PIO_INTERVAL

       ;

       FSM_Trn          <= 'H04;

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

    //  PIO write & read BAR[0]

       PIO_Addr         <= `C_ADDR_DMA_US_PAH + 'H8;

       PIO_bar          <= `C_BAR0_HIT;

       PIO_1st_BE       <= 4'Hf;

       Gap_Insert_Rx;

       Hdr_Array[0]     <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

       Hdr_Array[1]     <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, PIO_1st_BE};

       Hdr_Array[2]     <= {PIO_Addr[31:2], 2'b00};

       Private_Array[0] <= 'HF000_8888;

       Rx_TLP_Length    <= 'H01;

     # `T_DELTA

       TLP_Feed_Rx(`USE_PRIVATE, 'H0, PIO_bar);

       Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

       Gap_Insert_Rx;

     # `T_PIO_INTERVAL

       ;

     # `T_DELTA

       Hdr_Array[0]     <= `HEADER0_MRD3_ | Rx_TLP_Length[9:0];

       Hdr_Array[1]     <= {`C_HOST_RDREQ_ID, 3'H3, Rx_MRd_Tag, 4'Hf, PIO_1st_BE};

       Hdr_Array[2]     <= {PIO_Addr[31:2], 2'b00};

     # `T_DELTA

       TLP_Feed_Rx(`USE_PUBLIC, `PIO_START_INDEX, PIO_bar);

       Rx_MRd_Tag       <= Rx_MRd_Tag + 1;

       Gap_Insert_Rx;

       FSM_Trn          <= 'H08;

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

    //  PIO write & read BAR[1]

       PIO_Addr         <= 'H8000;

       PIO_bar          <= `C_BAR1_HIT;

       PIO_1st_BE       <= 4'Hf;

       Gap_Insert_Rx;

       Hdr_Array[0]     <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

       Hdr_Array[1]     <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, PIO_1st_BE};

       Hdr_Array[2]     <= {PIO_Addr[31:2], 2'b00};

       Private_Array[0] <= 'HA1111111;

       Rx_TLP_Length    <= 'H01;

     # `T_DELTA

       TLP_Feed_Rx(`USE_PRIVATE, 'H0, PIO_bar);

       Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

       Gap_Insert_Rx;

     # `T_PIO_INTERVAL

       ;

     # `T_DELTA

       Hdr_Array[0]     <= `HEADER0_MRD3_ | Rx_TLP_Length[9:0];

       Hdr_Array[1]     <= {`C_HOST_RDREQ_ID, 3'H3, Rx_MRd_Tag, 4'Hf, PIO_1st_BE};

       Hdr_Array[2]     <= {PIO_Addr[31:2], 2'b00};

     # `T_DELTA

       TLP_Feed_Rx(`USE_PRIVATE, `PIO_START_INDEX, PIO_bar);

       Rx_MRd_Tag       <= Rx_MRd_Tag + 1;

       Gap_Insert_Rx;

       FSM_Trn          <= 'H10;

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

    //  PIO write & read BAR[2]

    //  NOTE:  FIFO address is 64-bit aligned, only the lower 32-bit is

    //         accessible by BAR[2] PIO write and is returned in BAR[2] 

    //         PIO read.

       PIO_Addr         <= 'H0;

       PIO_bar          <= `C_BAR2_HIT;

       PIO_1st_BE       <= 4'Hf;

       Gap_Insert_Rx;

       Hdr_Array[0]     <= `HEADER0_MWR3_ | Rx_TLP_Length[9:0];

       Hdr_Array[1]     <= {`C_HOST_WRREQ_ID, Rx_MWr_Tag, 4'Hf, PIO_1st_BE};

       Hdr_Array[2]     <= {PIO_Addr[31:2], 2'b00};

       Private_Array[0] <= 'HB222_2222;

       Rx_TLP_Length    <= 'H01;

     # `T_DELTA

       TLP_Feed_Rx(`USE_PRIVATE, 'H0, PIO_bar);

       Rx_MWr_Tag   <= Rx_MWr_Tag + 1;

       Gap_Insert_Rx;

     # `T_PIO_INTERVAL

       ;

     # `T_DELTA

       Hdr_Array[0]     <= `HEADER0_MRD3_ | Rx_TLP_Length[9:0];

       Hdr_Array[1]     <= {`C_HOST_RDREQ_ID, 3'H3, Rx_MRd_Tag, 4'Hf, PIO_1st_BE};

       Hdr_Array[2]     <= {PIO_Addr[31:2], 2'b00};

     # `T_DELTA

       TLP_Feed_Rx(`USE_PUBLIC, `PIO_START_INDEX, PIO_bar);

       Rx_MRd_Tag       <= Rx_MRd_Tag + 1;

       Gap_Insert_Rx;

       FSM_Trn          <= 'H14;

     # `T_DMA_INTERVAL

       ;

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

    //  DMA write & read BAR[1]

    //  Single-descriptor case

       DMA_PA   <= 'H1234;

       DMA_HA   <= 'H5000;

       DMA_BDA  <= 'Hffff;