A Shared Priority Policy in Wormhole Cut-Through Switching Based Network-on-Chip

Network-on-Chip (NoC) based conventional wormhole cut-through switching (Con-WCTS) cannot employ the priority based arbitration logic directly,so it is not suitable for the multiprocessor system-on-chip with high real-time requirements.By utilizing the virtual channel technique,this paper constructs a shared priority wormhole cut-through switching (SP-WCTS) network and proposes a method to calculate the worst-case traversing time for the traffic-flow of the SP-WCTS NoC.Furthermore,some experiments are made for comparing the schedulability of Con-WCT,shared priority wormhole switching (SP-WS),SP-WCTS and round robin wormhole switching (RR-WS) NoCs and analyzing the effect of the number of VCs and the total network utilization on the schedulability of these different NoCs.It is shown that the SP-WCTS NoCs can achieves the best schedulability and the number of VCs has a greater effect on the schedulability of the SP-WS than SP-WCTS NoCs.