writing_binary_file_systemverilog.sv

function void writing_binary_file(int unsigned total_bytes_to_write=32);
  int fwrite;
  bit [7:0] wdata;
  
  //Open file with binary write mode("wb"), b here specifies binary
  fwrite=$fopen("binary_file.bin","wb");
  if(fwrite==0)
    `uvm_error("NO_FILE_FOUND","Couldn't open file binary_file.bin for writing")
  
  //iterate until all intended bytes are written
  for(int i=0,i<total_bytes_to_write,i++) begin
    //generate current random byte to write
    wdata=$urandom_range(0,255);
    
    //fwrite with %c writes only 1 byte at a time, use "%u" format for writing 32bit data
    $fwrite(fwrite,"%c",wdata);//Note that fwrite doesn't introduce newline character unless added with \n
     
  end 
  //close the file
  $fclose(fwrite)
endfunction