一种基于DDR的PS与PL数据交互方法的设计与实现  

Design and implementation of data interaction method between PS and PL based on DDR

作　　者：陈小宇[1] 李常对 阳梦雪 Chen Xiaoyu;Li Changdui;Yang Mengxue(College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China)

机构地区：[1]华中师范大学物理科学与技术学院,武汉430079

出　　处：《电子测量技术》2021年第24期79-84,共6页Electronic Measurement Technology

摘　　要：针对片上系统芯片中处理系统和可编程逻辑之间数据交互量大的应用,提出了一种基于双倍速率同步动态随机存储器的PS与PL数据交互方法。PS与PL通过访问共同的DDR,按照自定义的协议进行数据交互。将DDR中用于数据交互的空间划分为指令空间和数据空间,PS和PL通过读写指令空间中的指令数据并按照协议分析其所传递的信息,以控制各自的读写进程。PL通过高速片内总线访问DDR,PS利用内存读写工具实现对DDR的读写。测试结果表明该交互方法具有速度快、占用逻辑资源少、使用方便等优点,数据交互速度可达88 MB/s,适用于PS和PL需要实时交互大量数据的应用场景,在基于三维激光雷达的车辆实时高精度定位系统中得到了成功应用。Aiming at the application of large amount of data interaction between processing system and programmable logic in system of chip, a data interaction method between PS and PL based on double data rate synchronous dynamic random access memory is proposed. PS and PL interact with each other according to the custom protocol by accessing the common DDR. The space for data interaction in DDR is divided into instruction space and data space. PS and PL control their reading and writing processes by reading and writing instruction data in instruction space and analyzing the information they transmit according to the protocol. PL accesses DDR through high-speed on-chip bus, and PS uses memory read-write tools to read and write DDR. The test results show that the interaction method has the advantages of high speed, less logic resources and convenient use. The data interaction speed can reach 88 MB/s. It is suitable for the application scenario where PS and PL need to interact a large amount of data in real time. It has been successfully applied in the vehicle real-time high-precision positioning system based on three-dimensional lidar.

关 键 词：片上系统 数据交互 AXI总线 处理系统 可编程逻辑 双倍速率同步动态随机存储器 

分 类 号：TN409[电子电信—微电子学与固体电子学]