Application of reflective memory network in long-distance distributed system

trueleven

Application of reflective memory network in long-distance distributed system [Copy link]

Reflective Memory NetworkAs a mature technology, after years of development, it is currently in the semi-physical real-time[font=Verdana, Arial, 微软雅黑, 宋体 It is widely used in simulation, aircraft simulator, automatic detection system, engine test bench, power station simulator, high-speed data acquisition, over-the-horizon radar and other application fields. The unique hardware structure of reflective memory simplifies the real-time transmission of large amounts of data to the greatest extent. Software developers do not need to understand the complex data transmission process and retransmission mechanism. Read-only memory read and write operations are performed on the local device, and data synchronization with other nodes in the reflective memory network is automatically completed by hardware. This mechanism makes data transmission simple and fast, and its extremely high ease of use simplifies system design. Reflective Memory NetworkThe global memory, high-speed data transmission and software transparency of the node network in the reflective memory network make the reflective memory card have an incomparable advantage in the multi-machine communication solution. The system block diagram of the reflective memory card is shown in Figure 1. The system is mainly composed of SFF optical module, FPGA control module, SDRAM storage module, power and clock module, and serial deserializer. Among them, the SFF optical module realizes high-speed communication and interconnection between the FPGA control module and other reflective memory cards in the network, providing 2.125Gbps fiber channel connection; the FPGA control module uses high-performance FPGA chips to realize the entire data sending and receiving logic; the onboard 128M or 256M SDRAM is used to temporarily store the shared data of each reflective memory card in the network; the power and clock module provides the required power and clock for the system. The FPGA module transmits the changed data in the memory to other reflective memory nodes in the network through the serial deserializer and SFF optical module; at the same time, if the data in the memory of other reflective memory cards in the network changes, the FPGA module will also receive the changed data transmitted by the SFF optical module through a dedicated serial communication module and write it into the onboard memory to realize the interactive sharing of high-bandwidth data between computers in the LAN. Figure 1: Reflective memory card hardware principle block diagram Figure 2: Ring topology Reflective Memory Network provides a data insertion ring architecture network running at 2.12Gbaud over multimode or single-mode fiber optic cables. Unlike Ethernet systems, transmission between any nodes does not affect communication between other nodes. Reflective Memory Network avoids the complexity required to queue and check packets, ensure proper connectivity, and does not have additional load restrictions or terminal rules. The distance between nodes is up to 10KM. These features allow Reflective Memory to transmit data at rates up to 170 MB/s, far higher than the efficiency of Gigabit Ethernet at 100MB/s. Reflective Memory allows all network nodes to interrupt other or all nodes. Up to 4 interrupts can be assigned and can be customized by the user for reasons such as function, priority and vector. These interrupts can be used for any function, such as mailbox or network data synchronization. When enabled, interrupts are usually used to interrupt one or all network nodes after data transfer. Reflective Memory Real-Time Simulation The website shares a lot of technical information and use cases for download.[宋体] In some distributed systems, the distance between nodes is far, and the reflective memory card uses single-mode optical fiber, and the node distance can reach 10KM. For example, in a certain system, the equipment and the monitoring center must be kept at least 3KM away from it. By distributing the execution process, designers can install computers that can perform digitization and pre-processing operations on the test bench. In this way, in the control room, only a high-speed reflective memory network connection is required to send data back to the main computer, replacing hundreds of discrete wiring up to 3KM. This remote computer then analyzes, archives, formats and displays the data on the tester's data monitor. By using a high-speed reflective memory connection, the operator can observe and respond to changes when they occur, and there will be a slight delay when connecting. By arranging the control personnel and the core processing computer to a safe location away from the variable test, the operator can minimize the danger to personnel and equipment without affecting the test results. As shown in the figure below, China Electronics Technology Institute No. 8 and Real-time Simulation Technology Network conducted a 10KM single-mode optical fiber mass data transmission test. Figure 3: 10 km multimode fiber Microsoft YaHei, Songti] Figure 4: 10 km single-mode optical fiber transmission test site In real-time communication systems, reflective memory cards have gradually become standard. Its principle is easy to understand, the method of use is simple, the anti-interference ability is strong, the real-time performance is high, and it supports interrupt transmission and interruption. The software development code is small, the expansion ability is strong, and there are many application cases. It shortens the system development cycle, saves personnel expenses, and enhances the system robustness. It frees software developers from complex communication protocols and no longer wastes time worrying about bandwidth and uncertain delays for large-scale data transmission. Reflective memory cards are also used in industries including rail transportation, metallurgy, and power system simulation. The Real-time Simulation Technology Network shares a large number of use cases for download. This content is originally created by trueleven, a user of EEWORLD forum. If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source.

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The picture needs to be slightly adjusted haha I didn't have a complete face to learn when I came

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