Research And Implementation Of 3D Network-on-Chip Router For Heat And Congestion Contrl

With the improvement of 3D integrated circuit technology,the research of Network-on-Chip(NoC)has gradually shifted from 2D to 3D structures.Compared with 2D NoC,the 3D structure shortens global interconnection of NoC and reduces the latency and power consumption.However,due to the use of 3D stacking technology,the density of transistors has been increased,which inevitably aggravates the heat dissipation problem of 3D NoC.Router is the key component of 3D NoC,and its mechanism and structure design have a great impact on the performance of the entire system.The thesis carries out the research on the mechanism and structure of router for avoiding hotspots and congestion in 3D NoC.Firstly,a dual-threshold flow control mechanism based on Credit is proposed to solve the heat dissipation problems in 3D NoC.The mechanism controls the traffic of hotspots in the network through two temperature thresholds.Compared with the traditional flow control mechanism,the proposed flow control mechanism can effectively control the temperature of nodes in 3D NoC to avoid network hot spots.Secondly,for the congestion problem in 3D NoC,this paper proposes a dynamic priority arbitration mechanism based on remaining hops.Compared with the traditional arbitration mechanism,this mechanism preferentially transmits data packets with fewer remaining hops under the premise of ensuring fairness.This arbitration mechanism can reduce the number of data packets waiting in the network to reduce the average transmission delay,and improve network throughput,which can reduce the degree of network congestion.Then a 3D NoC router structure is proposed to implement the foregoing two mechanisms.In particular,the router architecture introduces a new type of non-volatile memory technology to design a public buffer,which can expand the capacity of the buffer to further alleviate congestion in the network.In the simulation environment based on Noxim,the proposed router flow control mechanism,arbitration mechanism and structure are simulated and validated respectively.The experimental results show that the proposed router achieves better performance and reduces network communication power consumption compared with traditional 3D NoC routers.Furthermore,Verilog language is used to model 3D NoC routers at RTL level,and the function verification and cost evaluation of the router are carried out.