Research And Modeling Of Photoelectric Hybrid NoC Based On Shared Transceiver

With the increasing number of computing nodes in system on-chip, the communication efficiency between nodes has become the main bottleneck of system performance. Traditional electric bus and networks on chip performance can not meet the demand of bandwidth and delay at the same time. The network chip structure of photoelectric hybrid has become a new research hotspot.Aiming at the problem that the utilization rate of optical channel in the existing photoelectric hybrid network is not sufficient, a mechanism for sharing adjacent transceiver is proposed, which improves the utilization rate of optical channel and improves the network performance.Firstly, the optical bus chip and the ring network on chip model are established by using the SystemC modeling language, and its performance is analyzed. On this basis, according to the bandwidth and delay parameters of optical devices, the network model of photoelectric hybrid is established by using SystemC modeling language. The NoC with a ring structure is responsible for data transmission of small packets and close loads. The optical bus with a tree structure is responsible for data handling of long distance and large packets. In the process of model simulation, the total number of flits and the delay time of each packet are counted. The performance of the established photoelectric hybrid model is tested under different load levels.The results show that the maximum measured bandwidth of optoelectronic hybrid network on chip is increased by 40.2% compared with the independent optical bus. Because of that when the amount of data in a node is too large and the amount of adjacent nodes is small, the optical channel of the node will be fully utilized. The optical channel of the neighboring nodes will be in the idle state. So that the utilization of optical channels is not sufficient. Therefore,based on the photoelectric hybrid NoC, the scheme of sharing the adjacent node transceiver and its idle optical channel is designed, which improves the utilization rate of the limited number of optical channels and improves the performance of the photoelectric hybrid NoC. In the course of the test, the total number of flits received and the delay time of each packet are counted at different injection rates. Then, the bandwidth and delay under different injection rates are analyzed. The results show that the shared the adjacent node transceiver structure of the photoelectric NoC, compared to non-shared structure of the photoelectric hybrid NoC, in the injection rate percentage of 35 to 90 range, the average delay reduced by 8.74%, the average bandwidth increased by 8.03%.