Debug in DS-5 with Cyclone V SoC


I'm using DS-5 Eclipse with the board ADC SoC (Cyclone V). I've finished compiling my project and succesfully built the final file App.axf. Now, I want to use this file to debug with my board. As I've seen in the examples, to debug, the user needs to create a scatter file. Could anyone tell me why the debug process needs a scatter file and do I need to create my own scatter file to debug my project ?? Thank you.