Research On The Interconnection Of Multi-core On Chip

With the development of the integrated circuit industry,the chip multi-processors(CMPs)becomes the inevitable trend of the processor development.Interconnection has more impact on high-performance computing chips than single computing units.With the demand of bandwidth increasing,the interconnection among processors becomes the bottleneck of the system.At present,there are two types of on-chip interconnect structure,including bus architecture and network on chip(NoC).The bus architecture is divided into the shared bus and the crossbar.In order to obtain the relative merits of various interconnection methods,in this paper,simulators are used to analyze resource cost and performance.Hierarchical crossbar switch architecture and NoC can overcome the problem of low communication bandwidth and poor scalability.For medium scale multi-processor system,a hierarchical crossbar structure is better in area consumption and network performance.When it comes to the interconnection of large number of nodes,NoC shows a great advantage in load capacity.Besides,the way of data transmission will greatly affects data bandwidth and latency.According to whether to establish a dedicated circuit,we can classify switch mechanism into packet switch mechanism and circuit switch mechanism.This article uses a RTL model to modify network performance and on-chip resource overhead with those two switch mechanisms.When the data package is large,packet switch mechanism shows load imbalance.In this case,circuit switch mechanism has better performance.When the data package is middle,circuit switch mechanism shows better with low injection rate,while packet switch mechanism can solve the problem of network congestion and performs better with injection rate increasing.Routing algorithm decides the path of a data package from the source node to the destination node.In this article,the evaluation of different algorithms focus on throughput and network latency.Considering the shuffle traffic mode that related to fast fourier transform,odd-even algorithm is superior to static XY algorithm for 15%.On the other hand,static XY algorithm performs better under random traffic mode.