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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                     ////

////                                                              ////

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

// This testbench stand-alone verify the sdram core

`timescale 1ns/1ps

module tb_core;

parameter P_SYS  = 10;     //    100MHz

// General

reg            RESETN;

reg            sdram_clk;

initial sdram_clk = 0;

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

parameter      dw              = 32;  // data width

parameter      tw              = 8;   // tag id width

parameter      bl              = 5;   // burst_lenght_width

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

// Application Interface bus

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

reg                   app_req            ; // Application Request

reg  [8:0]            app_req_len        ; // Burst Request length

wire                  app_req_ack        ; // Application Request Ack

reg [29:0]            app_req_addr       ; // Application Address

reg                   app_req_wr_n       ; // 1 -> Read, 0 -> Write

reg [dw-1:0]          app_wr_data        ; // Write Data

reg [dw/8-1:0]        app_wr_en_n        ; // Write Enable, Active Low

wire                  app_rd_valid       ; // Read Valid

wire                  app_last_rd        ; // Last Read Valid

wire                  app_last_wr        ; // Last Write Valid

wire [dw-1:0]         app_rd_data        ; // Read Data

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

// SDRAM I/F

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

`ifdef SDR_32BIT

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

   wire [31:0]           sdr_dout           ; // SDRAM Data Out

   wire [31:0]           pad_sdr_din        ; // SDRAM Data Input

   wire [3:0]            sdr_den_n          ; // SDRAM Data Enable

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

`elsif SDR_16BIT

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

   wire [15:0]           sdr_dout           ; // SDRAM Data Out

   wire [15:0]           pad_sdr_din        ; // SDRAM Data Input

   wire [1:0]            sdr_den_n          ; // SDRAM Data Enable

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

`else

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

   wire [7:0]           sdr_dout           ; // SDRAM Data Out

   wire [7:0]           pad_sdr_din        ; // SDRAM Data Input

   wire [0:0]           sdr_den_n          ; // SDRAM Data Enable

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

`endif

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

wire [11:0]           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;

wire #(1.0) pad_clk     = sdram_clk_d;

`ifdef SDR_32BIT

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

`elsif SDR_16BIT

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

`else  // 8 BIT SDRAM

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

`endif

      // System

          .clk                (sdram_clk          ),

          .reset_n            (RESETN             ),

          .pad_clk            (pad_clk            ),

`ifdef SDR_32BIT

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

`elsif SDR_16BIT

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

`else

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

`endif

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

/* Request from app */

          .app_req            (app_req            ),    // Transfer Request

          .app_req_addr       (app_req_addr       ),    // SDRAM Address

          .app_req_len        (app_req_len        ),    // Burst Length (in 16 bit words)

          .app_req_wrap       (1'b0               ),    // Wrap mode request (xfr_len = 4)

          .app_req_wr_n       (app_req_wr_n       ),    // 0 => Write request, 1 => read req

          .app_req_ack        (app_req_ack        ),    // Request has been accepted

          .app_wr_data        (app_wr_data        ),

          .app_wr_en_n        (app_wr_en_n        ),

          .app_rd_data        (app_rd_data        ),

          .app_last_rd        (app_last_rd        ),

          .app_last_wr        (app_last_wr        ),

          .app_rd_valid       (app_rd_valid       ),

          .app_wr_next_req    (app_wr_next_req    ),

          .app_req_dma_last   (app_req            ),

/* Interface to SDRAMs */

          .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           ),

          .pad_sdr_din        (Dq                 ),

          .sdr_dout           (sdr_dout           ),

          .sdr_den_n          (sdr_den_n          ),

    /* 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   (12'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

  assign Dq[7:0]    = (sdr_den_n[0] == 1'b0) ? sdr_dout[7:0]   : 8'hZZ;

  assign Dq[15:8]   = (sdr_den_n[1] == 1'b0) ? sdr_dout[15:8]  : 8'hZZ;

  assign Dq[23:16]  = (sdr_den_n[2] == 1'b0) ? sdr_dout[23:16] : 8'hZZ;

  assign Dq[31:24]  = (sdr_den_n[3] == 1'b0) ? sdr_dout[31:24] : 8'hZZ;

mt48lc2m32b2 #(.data_bits(32)) u_sdram32 (

          .Dq                 (Dq                 ) ,

          .Addr               (sdr_addr           ),

          .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

assign Dq[7:0]  = (sdr_den_n[0] == 1'b0) ? sdr_dout[7:0]  : 8'hZZ;

assign Dq[15:8] = (sdr_den_n[1] == 1'b0) ? sdr_dout[15:8] : 8'hZZ;

   IS42VM16400K u_sdram16 (

          .dq                 (Dq                 ),

          .addr               (sdr_addr           ),

          .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

assign Dq[7:0]  = (sdr_den_n[0] == 1'b0) ? sdr_dout[7:0]  : 8'hZZ;

mt48lc8m8a2 #(.data_bits(8)) u_sdram8 (

          .Dq                 (Dq                 ) ,

          .Addr               (sdr_addr           ),

          .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;

   app_req_addr  = 0;

   app_wr_data    = 0;

   app_wr_en_n    = 4'hF;

   app_req_wr_n   = 0;

   app_req        = 0;

   app_req_len    = 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'h4_0FFC,8'h8);

  burst_write(32'h0040_0FF8,8'hF);

  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 16 Write & 16 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();

  $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'h3f)+1);

 #100;

     StartAddr = $random & 32'h003FFFFF;

     burst_write(StartAddr,($random & 8'h3f)+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 sdram_clk);

   app_req        = 1;

   app_wr_en_n    = 0;

   app_req_wr_n   = 1'b0;

   app_req_addr   = Address[31:2];

   app_req_len    = bl;

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

   // wait for app_req_ack == 1

   do begin

       @ (posedge sdram_clk);

   end while(app_req_ack == 1'b0);

   @ (negedge sdram_clk);

   app_req           = 0;

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

      app_wr_data        = $random & 32'hFFFFFFFF;

      dfifo.push_back(app_wr_data);

      do begin

          @ (posedge sdram_clk);

      end while(app_wr_next_req == 1'b0);

          @ (negedge sdram_clk);

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

   end

   app_req           = 0;

   app_wr_en_n       = 4'hF;

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();

   app_req        = 1;

   app_wr_en_n    = 0;

   app_req_wr_n   = 1;

   app_req_addr   = Address[29:2];

   app_req_len    = bl;

      // wait for app_req_ack == 1

      do begin

          @ (posedge sdram_clk);

      end while(app_req_ack == 1'b0);

      @ (negedge sdram_clk);

      app_req           = 0;

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

         wait(app_rd_valid == 1);

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

         if(app_rd_data !== exp_data) begin

             $display("READ ERROR: Burst-No: %d Addr: %x Rxp: %x Exd: %x",j,Address+(j*2),app_rd_data,exp_data);

             ErrCnt = ErrCnt+1;

         end else begin

             $display("READ STATUS: Burst-No: %d Addr: %x Rxd: %x",j,Address+(j*2),app_rd_data);

         end

         @ (posedge sdram_clk);

         @ (negedge sdram_clk);

      end

end

endtask

endmodule