Flow Control Mechanism for Wireless Network-on-Chip

Network on chip (NoC) provides a network-based interconnect infrastructure that facilitates the communications among a slew of function cores in a modern System-on-chip (SoC) design. Apart from topology, switching technique and routing strategy adopted in an NoC, flow control scheme that regulates the packet injection rates is another determining factor that impacts the NoC efficiency. In this paper, we propose a Feedback-Based end-to-end congestion control scheme that supports Wireless NoC to make adjustment automatically´ upon receiving a feedback message, the source node will adjust its packet size and transmission rate accordingly. Besides, an arbitration optimization strategy, fast-forward scheme is imported to assign higher priority to the downstream flits at the same input port and to the same next output port, thus lighten the resource waste caused by the rest communication tasks. Finally, simulation results indicate the superiority.