Motivation. As more on-chip computation resources are available, the Networks-on-Chip (NoC) power consumption is expected to increase in the future many-core era. Many of these would have to be switched off while inactive to keep power consumption and chip temperature low. However, the NoC infrastructure must be kept alive to serve shared caches and memory accesses. A recent study shows that the proportion of NoC power consumption becomes appreciable in comparison to computation counterpart. A 32 core chip at 45nm substantially raises NoC power ( ~ 42%) among the remaining on-chip active resources (cores, shared caches, memory controllers, PCIe controllers) [1]. Therefore, low power becomes the primary objective for modern NoC designs.

Network Demultiplexer (Net-Demux) is an essential hardware unit in multiple NoCs for traffic distribution between the NoC networks. This paper proposes a novel idea of the placement of Net-Demux at the control plane of switch allocator of the router to improve static power and energy efficiency as compared to conventional data plane placement at the Network Interface (NI).