一种多优先级变长调度星载IP交换机交换结构的设计  

Design of Switch Fabric in Satellite Onboard IP Switch Based on a Multi-Priority Variable-Length Packets Scheduling

作　　者：沈泽民[1] 乔庐峰[1] 陈庆华[1] 邵世雷[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《电子学报》2014年第10期2045-2049,共5页Acta Electronica Sinica

摘　　要：针对星载IP交换机中硬件资源使用受限的情况,设计实现了一种具有8个优先级、采用指针复制和变长分组调度机制的大容量共享存储交换结构,给出了电路的具体组成、关键调度算法和工作流程.使用Xilinx V4sx55FPGA实现了完整的8×8交换结构,电路共占用了164K字节片上存储器资源和5982个4输入查找表,可以满足三模冗余设计要求.在系统工作主频为100MHz、片外采用SRAM、数据位宽为64的情况下,交换结构的峰值吞吐率可以达到1.6Gbps;片外采用133MHz DDR存储器、位宽为64时,交换结构的峰值吞吐率可以达到4.25Gbps;该交换单元进行多级扩展后,可以满足10Gbps以上的系统设计需求.Considering the hardware resources limitation in the satellite onboard IP switch,a high capacity shared memory switch fabric with 8 priorities,variable-length packets scheduling mechanisms and pointer copy is presented.The specific structure,the key scheduling algorithm and the working processes of the circuits are provided.Xilinx V4sx55 FPGA are used to realize a 8× 8 switch fabric,the circuits occupy 164 K bytes on-chip memory resources and 5982 4 input lookup tables,which can meet the requirements of triple modular redundancy.When the working frequency is 100 MHz,64 bit width off-chip SRAM,the peak throughput of the switch fabric can reach 1.6Gbps.Using 64 bit width,133 MHz DDR off-chip memory,the peak throughputs can reach 4.25 Gbps.The fabric can be used in multi-stage switch fabrics which can meet the demand of throughputs over 10 Gbps.

关 键 词：星载IP交换机 变长调度 队列管理 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]