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

////                                                              ////

////                                                              ////

////  This file is part of the SDRAM Controller project           ////

////  http://www.opencores.org/cores/sdr_ctrl/                    ////

////                                                              ////

////  Description                                                 ////

////  SDRAM CTRL definitions.                                     ////

////                                                              ////

////  To Do:                                                      ////

////    nothing                                                   ////

////                                                              ////

//   Version  :0.1 - Test Bench automation is improvised with     ////

//             seperate data,address,burst length fifo.           ////

//             Now user can create different write and            ////

//             read sequence                                      ////

//                                                                ////

////  Author(s):                                                  ////

////      - Dinesh Annayya, dinesha@opencores.org                 ////

////                                                              ////

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

////                                                              ////

//// Copyright (C) 2000 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                     ////

////                                                              ////

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

`timescale 1ns/1ps

// This testbench verify with SDRAM TOP

module tb_top;

parameter P_SYS  = 10;     //    200MHz

parameter P_SDR  = 20;     //    100MHz

// General

reg            RESETN;

reg            sdram_clk;

reg            sys_clk;

initial sys_clk = 0;

initial sdram_clk = 0;

always #(P_SYS/2) sys_clk = !sys_clk;

always #(P_SDR/2) sdram_clk = !sdram_clk;

parameter      dw              = 32;  // data width

parameter      tw              = 8;   // tag id width

parameter      bl              = 5;   // burst_lenght_width

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

// WISH BONE Interface

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

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

// Wish Bone Interface

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

reg             wb_stb_i           ;

wire            wb_ack_o           ;

reg  [25:0]     wb_addr_i          ;

reg             wb_we_i            ; // 1 - Write, 0 - Read

reg  [dw-1:0]   wb_dat_i           ;

reg  [dw/8-1:0] wb_sel_i           ; // Byte enable

wire  [dw-1:0]  wb_dat_o           ;

reg             wb_cyc_i           ;

reg   [2:0]     wb_cti_i           ;

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

// SDRAM I/F

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

`ifdef SDR_32BIT

   wire [31:0]           Dq                 ; // SDRAM Read/Write Data Bus

   wire [3:0]            sdr_dqm            ; // SDRAM DATA Mask

`elsif SDR_16BIT

   wire [15:0]           Dq                 ; // SDRAM Read/Write Data Bus

   wire [1:0]            sdr_dqm            ; // SDRAM DATA Mask

`else

   wire [7:0]           Dq                 ; // SDRAM Read/Write Data Bus

   wire [0:0]           sdr_dqm            ; // SDRAM DATA Mask

`endif

wire [1:0]            sdr_ba             ; // SDRAM Bank Select

wire [12:0]           sdr_addr           ; // SDRAM ADRESS

wire                  sdr_init_done      ; // SDRAM Init Done

// to fix the sdram interface timing issue

wire #(2.0) sdram_clk_d   = sdram_clk;

`ifdef SDR_32BIT

   sdrc_top #(.SDR_DW(32),.SDR_BW(4)) u_dut(

`elsif SDR_16BIT

   sdrc_top #(.SDR_DW(16),.SDR_BW(2)) u_dut(

`else  // 8 BIT SDRAM

   sdrc_top #(.SDR_DW(8),.SDR_BW(1)) u_dut(

`endif

      // System

`ifdef SDR_32BIT

          .cfg_sdr_width      (2'b00              ), // 32 BIT SDRAM

`elsif SDR_16BIT

          .cfg_sdr_width      (2'b01              ), // 16 BIT SDRAM

`else

          .cfg_sdr_width      (2'b10              ), // 8 BIT SDRAM

`endif

          .cfg_colbits        (2'b00              ), // 8 Bit Column Address

/* WISH BONE */

          .wb_rst_i           (!RESETN            ),

          .wb_clk_i           (sys_clk            ),

          .wb_stb_i           (wb_stb_i           ),

          .wb_ack_o           (wb_ack_o           ),

          .wb_addr_i          (wb_addr_i          ),

          .wb_we_i            (wb_we_i            ),

          .wb_dat_i           (wb_dat_i           ),

          .wb_sel_i           (wb_sel_i           ),

          .wb_dat_o           (wb_dat_o           ),

          .wb_cyc_i           (wb_cyc_i           ),

          .wb_cti_i           (wb_cti_i           ),

/* Interface to SDRAMs */

          .sdram_clk          (sdram_clk          ),

          .sdram_resetn       (RESETN             ),

          .sdr_cs_n           (sdr_cs_n           ),

          .sdr_cke            (sdr_cke            ),

          .sdr_ras_n          (sdr_ras_n          ),

          .sdr_cas_n          (sdr_cas_n          ),

          .sdr_we_n           (sdr_we_n           ),

          .sdr_dqm            (sdr_dqm            ),

          .sdr_ba             (sdr_ba             ),

          .sdr_addr           (sdr_addr           ),

          .sdr_dq             (Dq                 ),

    /* Parameters */

          .sdr_init_done      (sdr_init_done      ),

          .cfg_req_depth      (2'h3               ),            //how many req. buffer should hold

          .cfg_sdr_en         (1'b1               ),

          .cfg_sdr_mode_reg   (13'h033            ),

          .cfg_sdr_tras_d     (4'h4               ),

          .cfg_sdr_trp_d      (4'h2               ),

          .cfg_sdr_trcd_d     (4'h2               ),

          .cfg_sdr_cas        (3'h3               ),

          .cfg_sdr_trcar_d    (4'h7               ),

          .cfg_sdr_twr_d      (4'h1               ),

          .cfg_sdr_rfsh       (12'h100            ), // reduced from 12'hC35

          .cfg_sdr_rfmax      (3'h6               )

);

`ifdef SDR_32BIT

mt48lc2m32b2 #(.data_bits(32)) u_sdram32 (

          .Dq                 (Dq                 ) ,

          .Addr               (sdr_addr[10:0]     ),

          .Ba                 (sdr_ba             ),

          .Clk                (sdram_clk_d        ),

          .Cke                (sdr_cke            ),

          .Cs_n               (sdr_cs_n           ),

          .Ras_n              (sdr_ras_n          ),

          .Cas_n              (sdr_cas_n          ),

          .We_n               (sdr_we_n           ),

          .Dqm                (sdr_dqm            )

     );

`elsif SDR_16BIT

   IS42VM16400K u_sdram16 (

          .dq                 (Dq                 ),

          .addr               (sdr_addr[11:0]     ),

          .ba                 (sdr_ba             ),

          .clk                (sdram_clk_d        ),

          .cke                (sdr_cke            ),

          .csb                (sdr_cs_n           ),

          .rasb               (sdr_ras_n          ),

          .casb               (sdr_cas_n          ),

          .web                (sdr_we_n           ),

          .dqm                (sdr_dqm            )

    );

`else

mt48lc8m8a2 #(.data_bits(8)) u_sdram8 (

          .Dq                 (Dq                 ) ,

          .Addr               (sdr_addr[11:0]     ),

          .Ba                 (sdr_ba             ),

          .Clk                (sdram_clk_d        ),

          .Cke                (sdr_cke            ),

          .Cs_n               (sdr_cs_n           ),

          .Ras_n              (sdr_ras_n          ),

          .Cas_n              (sdr_cas_n          ),

          .We_n               (sdr_we_n           ),

          .Dqm                (sdr_dqm            )

     );

`endif

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

// data/address/burst length FIFO

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

int dfifo[$]; // data fifo

int afifo[$]; // address  fifo

int bfifo[$]; // Burst Length fifo

reg [31:0] read_data;

reg [31:0] ErrCnt;

int k;

reg [31:0] StartAddr;

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

// Test Case

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

initial begin //{

  ErrCnt          = 0;

   wb_addr_i      = 0;

   wb_dat_i      = 0;

   wb_sel_i       = 4'h0;

   wb_we_i        = 0;

   wb_stb_i       = 0;

   wb_cyc_i       = 0;

  RESETN    = 1'h1;

 #100

  // Applying reset

  RESETN    = 1'h0;

  #10000;

  // Releasing reset

  RESETN    = 1'h1;

  #1000;

  wait(u_dut.sdr_init_done == 1);

  #1000;

  $display("-------------------------------------- ");

  $display(" Case-1: Single Write/Read Case        ");

  $display("-------------------------------------- ");

  burst_write(32'h4_0000,8'h4);

 #1000;

  burst_read();

  // Repeat one more time to analysis the

  // SDRAM state change for same col/row address

  $display("-------------------------------------- ");

  $display(" Case-2: Repeat same transfer once again ");

  $display("----------------------------------------");

  burst_write(32'h4_0000,8'h4);

  burst_read();

  burst_write(32'h0040_0000,8'h5);

  burst_read();

  $display("----------------------------------------");

  $display(" Case-3 Create a Page Cross Over        ");

  $display("----------------------------------------");

  burst_write(32'h0000_0FF0,8'h8);

  burst_write(32'h0001_0FF4,8'hF);

  burst_write(32'h0002_0FF8,8'hF);

  burst_write(32'h0003_0FFC,8'hF);

  burst_write(32'h0004_0FE0,8'hF);

  burst_write(32'h0005_0FE4,8'hF);

  burst_write(32'h0006_0FE8,8'hF);

  burst_write(32'h0007_0FEC,8'hF);

  burst_write(32'h0008_0FD0,8'hF);

  burst_write(32'h0009_0FD4,8'hF);

  burst_write(32'h000A_0FD8,8'hF);

  burst_write(32'h000B_0FDC,8'hF);

  burst_write(32'h000C_0FC0,8'hF);

  burst_write(32'h000D_0FC4,8'hF);

  burst_write(32'h000E_0FC8,8'hF);

  burst_write(32'h000F_0FCC,8'hF);

  burst_write(32'h0010_0FB0,8'hF);

  burst_write(32'h0011_0FB4,8'hF);

  burst_write(32'h0012_0FB8,8'hF);

  burst_write(32'h0013_0FBC,8'hF);

  burst_write(32'h0014_0FA0,8'hF);

  burst_write(32'h0015_0FA4,8'hF);

  burst_write(32'h0016_0FA8,8'hF);

  burst_write(32'h0017_0FAC,8'hF);

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  $display("----------------------------------------");

  $display(" Case:4 4 Write & 4 Read                ");

  $display("----------------------------------------");

  burst_write(32'h4_0000,8'h4);

  burst_write(32'h5_0000,8'h5);

  burst_write(32'h6_0000,8'h6);

  burst_write(32'h7_0000,8'h7);

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  $display("---------------------------------------");

  $display(" Case:5 24 Write & 24 Read With Different Bank and Row ");

  $display("---------------------------------------");

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

  // Address Decodeing:

  //  with cfg_col bit configured as: 00

  //    <12 Bit Row> <2 Bit Bank> <8 Bit Column> <2'b00>

  //

  burst_write({12'h000,2'b00,8'h00,2'b00},8'h4);   // Row: 0 Bank : 0

  burst_write({12'h000,2'b01,8'h00,2'b00},8'h5);   // Row: 0 Bank : 1

  burst_write({12'h000,2'b10,8'h00,2'b00},8'h6);   // Row: 0 Bank : 2

  burst_write({12'h000,2'b11,8'h00,2'b00},8'h7);   // Row: 0 Bank : 3

  burst_write({12'h001,2'b00,8'h00,2'b00},8'h4);   // Row: 1 Bank : 0

  burst_write({12'h001,2'b01,8'h00,2'b00},8'h5);   // Row: 1 Bank : 1

  burst_write({12'h001,2'b10,8'h00,2'b00},8'h6);   // Row: 1 Bank : 2

  burst_write({12'h001,2'b11,8'h00,2'b00},8'h7);   // Row: 1 Bank : 3

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_write({12'h002,2'b00,8'h00,2'b00},8'h4);   // Row: 2 Bank : 0

  burst_write({12'h002,2'b01,8'h00,2'b00},8'h5);   // Row: 2 Bank : 1

  burst_write({12'h002,2'b10,8'h00,2'b00},8'h6);   // Row: 2 Bank : 2

  burst_write({12'h002,2'b11,8'h00,2'b00},8'h7);   // Row: 2 Bank : 3

  burst_write({12'h003,2'b00,8'h00,2'b00},8'h4);   // Row: 3 Bank : 0

  burst_write({12'h003,2'b01,8'h00,2'b00},8'h5);   // Row: 3 Bank : 1

  burst_write({12'h003,2'b10,8'h00,2'b00},8'h6);   // Row: 3 Bank : 2

  burst_write({12'h003,2'b11,8'h00,2'b00},8'h7);   // Row: 3 Bank : 3

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_write({12'h002,2'b00,8'h00,2'b00},8'h4);   // Row: 2 Bank : 0

  burst_write({12'h002,2'b01,8'h01,2'b00},8'h5);   // Row: 2 Bank : 1

  burst_write({12'h002,2'b10,8'h02,2'b00},8'h6);   // Row: 2 Bank : 2

  burst_write({12'h002,2'b11,8'h03,2'b00},8'h7);   // Row: 2 Bank : 3

  burst_write({12'h003,2'b00,8'h04,2'b00},8'h4);   // Row: 3 Bank : 0

  burst_write({12'h003,2'b01,8'h05,2'b00},8'h5);   // Row: 3 Bank : 1

  burst_write({12'h003,2'b10,8'h06,2'b00},8'h6);   // Row: 3 Bank : 2

  burst_write({12'h003,2'b11,8'h07,2'b00},8'h7);   // Row: 3 Bank : 3

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  burst_read();

  $display("---------------------------------------------------");

  $display(" Case: 6 Random 2 write and 2 read random");

  $display("---------------------------------------------------");

  for(k=0; k < 20; k++) begin

     StartAddr = $random & 32'h003FFFFF;

     burst_write(StartAddr,($random & 8'h0f)+1);

 #100;

     StartAddr = $random & 32'h003FFFFF;

     burst_write(StartAddr,($random & 8'h0f)+1);

 #100;

     burst_read();

 #100;

     burst_read();

 #100;

  end

  #10000;

        $display("###############################");

    if(ErrCnt == 0)

        $display("STATUS: SDRAM Write/Read TEST PASSED");

    else

        $display("ERROR:  SDRAM Write/Read TEST FAILED");

        $display("###############################");

    $finish;

end

task burst_write;

input [31:0] Address;

input [7:0]  bl;

int i;

begin

  afifo.push_back(Address);

  bfifo.push_back(bl);

   @ (negedge sys_clk);

   $display("Write Address: %x, Burst Size: %d",Address,bl);

   for(i=0; i < bl; i++) begin

      wb_stb_i        = 1;

      wb_cyc_i        = 1;

      wb_we_i         = 1;

      wb_sel_i        = 4'b1111;

      wb_addr_i       = Address[31:2]+i;

      wb_dat_i        = $random & 32'hFFFFFFFF;

      dfifo.push_back(wb_dat_i);

      do begin

          @ (posedge sys_clk);

      end while(wb_ack_o == 1'b0);

          @ (negedge sys_clk);

       $display("Status: Burst-No: %d  Write Address: %x  WriteData: %x ",i,wb_addr_i,wb_dat_i);

   end

   wb_stb_i        = 0;

   wb_cyc_i        = 0;

   wb_we_i         = 'hx;

   wb_sel_i        = 'hx;

   wb_addr_i       = 'hx;

   wb_dat_i        = 'hx;

end

endtask

task burst_read;

reg [31:0] Address;

reg [7:0]  bl;

int i,j;

reg [31:0]   exp_data;

begin

   Address = afifo.pop_front();

   bl      = bfifo.pop_front();

   @ (negedge sys_clk);

      for(j=0; j < bl; j++) begin

         wb_stb_i        = 1;

         wb_cyc_i        = 1;

         wb_we_i         = 0;

         wb_addr_i       = Address[31:2]+j;

         exp_data        = dfifo.pop_front(); // Exptected Read Data

         do begin

             @ (posedge sys_clk);

         end while(wb_ack_o == 1'b0);

         if(wb_dat_o !== exp_data) begin

             $display("READ ERROR: Burst-No: %d Addr: %x Rxp: %x Exd: %x",j,wb_addr_i,wb_dat_o,exp_data);

             ErrCnt = ErrCnt+1;

         end else begin

             $display("READ STATUS: Burst-No: %d Addr: %x Rxd: %x",j,wb_addr_i,wb_dat_o);

         end

         @ (negedge sdram_clk);

      end

   wb_stb_i        = 0;

   wb_cyc_i        = 0;

   wb_we_i         = 'hx;

   wb_addr_i       = 'hx;

end

endtask

endmodule