Research On Multi-Access Source Arbitration Control Scheme Based On DDR3

With the rapid development of the QKD system,there are more and more external access source modules integrated on the QKD system.Each access source module will compete for the access control right of DDR3 resources,thus affecting the performance and running speed of the QKD system,in order to solve the problem,this paper proposes a multi-access source arbitration control scheme based on DDR3.Based on the analysis of the advantages and disadvantages of the existing arbitration,this paper proposes a new arbitration control scheme.The first-level arbitration circuit is used to arbitrate the read and write commands,and add packet header information to the commands to facilitate the next-level circuit arbitration.The second-level arbitration circuit is used to deal with the situation that multiple ports access DDR3 resources at the same time.It adopts the method of combining dynamic weighting and round-robin arbitration,and determines the initial weight value through the port flow value to realize the dynamic adjustment of the weight.The third-level arbitration circuit is used to arbitrate the commands for accessing DDR3.By using the method of combining timeout and polling arbitration,the commands can access DDR3 resources in an orderly manner.According to the design scheme,this paper then builds a verification platform for module-level and system-level functional simulation verification.The arbitration scheme proposed in this paper can meet the requirements of both real-time and target bandwidth,quickly realize complex arbitration functions,and achieve the optimization goal of high throughput rate.The self-adjusting weight dynamic arbitration algorithm determines the priority weight of each access source according to the statistical bandwidth value of different access sources,and then combining the timeout mechanism and polling arbitration.The arbitration scheme proposed in this paper can be widely used in various works of the QKD system,which is beneficial to improve the performance index of the QKD system,and provides a new idea for further improving the work efficiency of the QKD system,which has important academic significance and engineering application value.