| As information technology develops by leaps and bounds,there is a massive explosion in data capacity and data processing capacity.In order to meet the growing demand for communication,the integration of more processing core units on a single chip has become the mainstream development direction.Thanks to the rapid development of Complementary metal oxide semiconductor(CMOS)on-chip technology,billions of transistors can be integrated on a chip,Multiprocessor systems-on-chip(MPSo Cs)are also widely favored in various fields.As more performance requirements are designed into the chip,traditional electrical interconnects are no longer able to meet the communication needs of large scale multi-core chips due to significant delay,signal crosstalk and other parasitic effects,and the search for better on-chip interconnects is imminent.In this context,Optical networks-on-chip(ONo Cs),which use optical media to interconnect chips and have the advantages of high bandwidth,low power consumption and low latency that Electric networks-on-chip(ENo Cs)cannot match,have come into the limelight.ONo Cs are responsible for interconnecting and communicating between the Intellectual property(IP).Its topology reflects the location and connectivity of the network nodes,and is the first step in implementing the communication routing protocol,which has a critical impact on network communication quality,reliability and cost.In ONo Cs,packets are sent from the IP core of the source node and routed to the IP core of the destination node through several routers for inter-node communication.However,in order to meet different communication requirements and find the optimal communication mode,the network topology used for packet transmission will be different.At present,Mesh,Torus and Fatree are the most widely used topologies in ONo Cs.Torus structure has the advantages of high connectivity and expansibility despite its simple structure due to its annular structure.However,with the continuous expansion of ONo Cs scale and the continuous improvement of communication quality requirements,the traditional Torus structure has been unable to meet the requirements.This paper proposes a new Double-path ONo Cs based on Torus topology,named DPtorus.The DPtorus consists of two layers: one layer is a Torus network divided into clusters of structural units,the other layer is an all-pass optical network.The two-layer network is connected with each other by optical through holes,so that there are two communication modes to choose from in the communication process between the source node and the target node in the network.According to the hop number comparison of two communication paths,the communication path between nodes is selected optimally.The main contents of this paper are as follows:First of all,the theoretical foundations of ONo Cs are described,silicon-based optical waveguides,Micro-ring resonators(MR)based on Silicon-on-insulator(SOI)on insulated substrates are introduced,and mathematical models for the loss of basic optical switching units are constructed.Secondly,Torus network is described and analysed,and the loss calculation models regarding the different structures are discussed.This is followed by the design of the DPtorus network,as well as the proposal of a double-path decision routing protocol for DPtorus network;in addition,an overview of the optical routing exchange mechanism is given.Finally,Matlab is used to compare the transmission loss of DPtorus and Torus network,and it was concluded that the loss of DPtorus is lower than that of Torus;then,based on the OPNET simulation platform,the End-to-end delay(ETE delay)and Network throughput of the two architectures were compared at different scales,and the results showed that the DPtorus have better network performance. |
