What has been presented so far is the 100 compute unit AI Engine design utilizing all 400 AI Engine tiles. However, to get there you had to create the intermediate AI Engine designs that contain a single compute unit (4 tiles) and 10 compute units (40 tiles). If you wish to run the aiesimulator, hardware emulation, or build an AI Engine NBody Simulator with significantly shorter build times, feel free to build the x1_design or x10_design.