The AI Engine’s 100 N-Body Subsystems crunch the N-Body equations on the input_i and input_j data. It then outputs four data packets on each of the 100 output_i ports. Each output data packet can have a header of 0, 1, 2, or 3. This indicates that it comes from nbody_kernel[0], nbody_kernel[1], nbody_kernel[2], or nbody_kernel[3] in each of the nbody_subsystems. The 100 output_i ports connect to the 100 rx streams on the packet_receiver kernel. The packet_receiver kernel receives four packets from each of the 100 rx streams, and depending on the packet header, writes the data to tx0, tx1, tx2, or tx3 streams.