TMS320F28335 XINTF - time delay between accessing to external RAM.

I use TMS320F28335 XINTF wit 16 bit data bus. It's connected to RAM IS61LV6416L. I use TI example code: Example_2833xDMA_xintf_to_ram

Almost everything works fine, but I can't understand why do I have that long time delay between access to next RAM cells. I have pluged my probe to chip select pin of zone 7. When I execute code from example, exactly this part :  

  for (i=0; i<BUF_SIZE; i++)
   {
     DMABuf1[i] = 0;
     DMABuf2[i] = i; //it is in external RAM
   }

Why there is about 110ns delay between accessing again to ext. RAM. I need almost no delay(can be 10ns) between one write/read and another.

Writing time is 40ns - which is ok.