一种用于高速通信的虚拟DDR存储器设计及其FPGA实现

Design of Virtual DDR SDRAM Used for High Speed Communications and Its Implementation with FPGA

机群系统中,互连网络性能对整个机群系统的性能有着至关重要的影响,传统互联网络适配器基本上基于PCI接口,节点出口带宽理论上限132MB/s犤1犦。论文提出虚拟DDR(DoubleDataRateSDRAM)存储器这一概念,定义了虚拟DDR存储器的行为,并将其用于基于DDR内存接口的互联网络适配器中,该互联网络适配器在主板时钟频率100MHz时,节点带宽上限达到1600MB/s,带宽比基于PCI接口提高了12倍。基于FPGA的实现验证了虚拟DDR存储器及建立其上的网络适配器的可行性和正确性。

In cluster system,the interconnection network is critical to the performance of the cluster system.The traditional network interface card is almost all based on PCI interface,so its maximal output bandwidth is 132MB/s1 in theory.This paper puts forward a new concept of a virtual DDR(Double Data Rate SDRAM)memory,defines its actions and applies it to an interconnection network interface card based on DDR interface.At a frequency of 100MHz,the maximal node output bandwidth of this interconnection network interface card has reached 1600MB/s,which is 12 times faster than the card based on PCI interface.The implementation based on a FPGA chip has verified the feasibility and the correctness of the interconnection network interface card built on the virtual DDR memory,and verified the memory itself.