The Design Of 3D NoC Routing And The Research On Algorithm For Thermal Dissipation Management

With the continuous development of integrated circuit technology and the continuous improvment of chip integrated density in three dimensional network-on-chip, the heat dissipation problem of NoC chip will be inevitable. The router structure and routing algorithm of NoC are the key factor affecting the heat dissipation performance. Therefore, the research on router and routing algorithm is especially important to solve the heat problem.This paper firstly maked a study of heat problem and analyzed the differences of general 3D NoC routing algorithm in the heat performance, then it established the implementation scheme of real-time temperature sensor and heat routing algorithm. Real-time temperature perception is necessary for solving heat problems, this paper constructed the temperature model through the analysis of 3D NoC router structure. Then, it designed the temperature sensor based on RTL class model after the transformation of router structure, and simulated the temperature sensing performance in Modelsim. Aimed at the flow and temperature information sharing problem, this paper studied a path-based Copy-Modify multicast routing algorithm, and added a thermal-traffic information interactive module in the router for the design of thermal-traffic information communication mechanism. For the purpose of 3D NoC heat, based on the temperature sensor and communication mechanism, this paper proposed a staged-collaborative routing algorithm for heat. The algorithm combinated region avoidanced routing and traffic balanced routing, switched routing strategy according to the network temperature and traffic status. At the same time, this paper established of the simulation model of 3D Mesh structure, and verified the performance of routing algorithm in heat and traffic equalization.Compared the simulation results of the designed temperature sensor and Hot Spot, the average error was 3.34% and it could realized the real-time temperature sensing accurately. With no large effect on 3D NoC network delay and throughput.The proposed routing algorithm achieved 34.67% and 14.85% inprovment in temperature-traffic balanced performance compared to Regional avoidance routing algorithm and Vertically Downward Routing algorithm.