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Cheers Dave. I am doing the interactive testbench for now but I am having problems with reading the input data file. I have an array of size 153600 bytes that I save as follows in matlab:

fid = fopen('image_binval.bin', 'w');
fwrite(fid, data_image_1d,'uint8');
 

The main parts of my current systemverilog testbench file are shown below. I am just making sure the correct values are being read in. When I run it in modelsim, src_transaction.data shows the correct data values in the wavewindow until variable i reaches 57672. After that, it just displays a x in between red lines. I can't find where I am going wrong. Any help please?

`define NUMBER_OF_PIXEL_VALUES 153600 
`timescale 1ns / 1ps
 
module sopc_system_tb();
  import verbosity_pkg::*;
 
  // 50MHz clock period
  localparam time CLK50_PERIOD = (1.0e9/50.0e6)*1ns;
 
  // Clock and reset
  logic clk;
  logic rstN;
 
  // Avalon ST
  typedef logic  AvalonSTData_t;
 
  reg   storage_values ; //153600 values for 640x240 image
 
  integer fileInput, r;
 
 
  //the ST transaction is defined using SystemVerilog structure data type
   typedef struct 
  {    int               idles;  //idle is not part of Avalon ST signal, it is used in BFM only
       bit               startofpacket;
       bit               endofpacket;
       AvalonSTData_t    data;
   } transaction_struct;
 
  transaction_struct src_transaction, snk_transaction; 
  int i, j;
  // 50MHz system clock
 initial
  clk = 1'b0;
 always
 # (CLK50_PERIOD/2) clk <= ~clk;
 
  // SOPC system -Set up the Dut
  sopc_system 
  dut
    (
      .clk_0   (clk),
      .reset_n (rstN)
    );
 
 
  // Stimulus
 // ------------------------------------------------------------
 
  initial
  begin
      // Initialize input and output text files
      fileInput  = $fopen("image_binval.bin", "r");
      r = $fread(storage_values, fileInput, 0, `NUMBER_OF_PIXEL_VALUES-1); 
 
      // Initialize the BFM
      // ------------------------------------------------------------
     set_verbosity(`VERBOSITY);
    `SRC.init();
    `SNK.init();
 
      rstN = 0;
     # 50ns rstN <= 1; 
 
      // --------------------------------------------------------
      $display("Simulation Start");
      // --------------------------------------------------------
 
       for (i = 0; i < `NUMBER_OF_PIXEL_VALUES; i++)
         begin 
          @(posedge clk);
          src_transaction.idles          = 0;       
          src_transaction.data           = storage_values;
 
          if (i == 0)   
              src_transaction.startofpacket  = 1;
          else
              src_transaction.startofpacket  = 0;
 
          if (i == `NUMBER_OF_PIXEL_VALUES-1)
              src_transaction.endofpacket    = 1;
          else
              src_transaction.endofpacket    = 0;
 
       end 
   end
 
 
endmodule