GE VMIVME-5576 high-speed fiber optic reflective memory

GE VMIVME-5576 high-speed fiber optic reflective memory

Product positioning and core values

GE VMIVME-5576 is a high-speed fiber optic reflective memory module based on the VME bus architecture launched by General Electric (GE). It is designed for industrial real-time control systems, aerospace testing platforms, power system monitoring, and other scenarios that require extremely high real-time and reliable data transmission. This product uses fiber optic as the transmission medium and integrates the low latency characteristics of reflective memory technology to achieve high-speed data sharing and synchronization between multiple nodes, providing accurate and efficient data exchange support for distributed control systems. It is the core data communication component that ensures the collaborative operation of complex systems.

Its core value lies in breaking the delay bottleneck of traditional data transmission. Through a "reflective" data access mechanism, each node in the network can directly read data from shared memory without going through complex protocol parsing and data forwarding processes, greatly improving the response speed and synchronization accuracy of distributed systems, especially suitable for high real-time control scenarios that require multi node collaborative work.

Core technical characteristics

2.1 High speed fiber optic communication architecture

VMIVME-5576 uses optical fiber as the core transmission medium, combined with a dedicated communication chip, to construct a low loss, anti-interference high-speed data transmission link with the following characteristics:

-The ultra-high transmission rate supports multi rate fiber optic interface configuration, with mainstream rates covering 1Gbps, 2Gbps, and 4Gbps, which can be flexibly selected according to system requirements. The single channel data transmission delay is as low as nanoseconds, far superior to traditional Ethernet and serial communication methods, ensuring real-time transmission of control instructions and data.

-The long-distance transmission capability relies on the low attenuation characteristics of fiber optic transmission, and under single-mode fiber configuration, the transmission distance can reach over 10km; Under multi-mode fiber configuration, it can also achieve hundreds of meters of transmission, meeting the connection requirements of long-distance nodes in large distributed systems without the need for additional signal amplification equipment deployment.

-Fiber optic transmission with strong anti-interference performance is based on optical signals and is not affected by electromagnetic interference (EMI), radio frequency interference (RFI), and grounding loops. It can maintain stable communication in industrial strong electromagnetic environments and complex electromagnetic scenarios in aerospace, avoiding system failures caused by data transmission errors.

2.2 Reflection Memory Core Mechanism

The core advantage of this module lies in the application of reflective memory technology, which achieves efficient sharing of multi node data through hardware level memory mapping and data synchronization

-The distributed memory sharing module allocates independent memory regions on each node. When a node writes data, the hardware automatically "reflects" the data to the corresponding memory addresses of all other nodes in the network, allowing all nodes to obtain a consistent view of the data and achieving the effect of "write and share".

-When low latency data access nodes access shared data, they do not need to make data requests and responses through the network protocol stack, and can directly perform read and write operations on locally mapped memory. The access latency is equivalent to local memory access, effectively ensuring the fast response requirements of real-time control systems.

-The built-in hardware synchronization mechanism ensures data consistency and supports multi node data synchronization based on clock signals or trigger signals, ensuring that all nodes maintain temporal consistency in reading shared data and avoiding control logic disorder caused by data asynchrony.

2.3 VME bus adaptation and expansion capability

As a VME bus module, VMIVME-5576 is perfectly adapted to the VMEbus specification, with good compatibility and system scalability:

-The standard VME bus interface follows the VMEbus Rev. C. specification, supports 32-bit/64 bit data width and multiple address mapping modes, and can be directly inserted into a chassis that complies with the VME standard. It works seamlessly with other VME modules (such as CPU modules and I/O modules), reducing the difficulty of system integration.

-The flexible memory configuration module has a built-in configurable memory capacity, with regular configurations covering 16MB, 32MB, and 64MB. It supports users to expand according to their data storage needs, meeting the shared data storage requirements of distributed systems of different scales.

-The multi node networking capability supports various networking topologies such as star and ring, with a maximum of 32 nodes that can be accessed in a single network. After expansion through fiber optic switches, it can achieve larger scale node interconnection and adapt to the application needs of distributed systems ranging from small to large.

2.4 High reliability and redundant design

In response to the high reliability requirements in key fields such as industrial control and aerospace, VMIVME-5576 adopts multiple redundancy and fault protection design:

-The redundant models of the dual fiber channel support dual fiber channel configuration. When the main channel fails (such as fiber breakage or interface failure), the system can automatically switch to the backup channel to ensure uninterrupted data transmission and improve the system's fault tolerance.

-The hardware fault self check is equipped with a comprehensive self check circuit, which can monitor the module power supply status, fiber interface status, memory working status, and communication link quality in real time. When a fault is detected, it will be promptly alerted through the VME bus interrupt signal or status indicator light, making it easy for operation and maintenance personnel to quickly locate the problem.

-Industrial grade environmental adaptability adopts industrial grade components and reinforcement design, with a working temperature range covering -40 ℃~85 ℃. It has strong anti vibration and anti impact capabilities, and can adapt to harsh industrial environments and the application needs of mobile platforms such as vehicles and ships.

Key technical parameters

Bus type

VMEbus Rev. C.1， 32/64 bits

Compatible with standard VME system and supports high-speed data exchange

fiber optic interface

SC/ST connector, single mode/multi-mode optional

Single mode transmission distance ≤ 10km, multi-mode transmission distance ≤ 500m

transmission rate

1Gbps/2Gbps/4Gbps optional

The speed can be adjusted through hardware dialing or software configuration

Reflective memory capacity

16MB/32MB/64MB optional

Support byte, half word, word, and long word level data access

data delay

Data transmission delay between nodes ≤ 500ns

Excluding application layer processing time, only hardware transmission delay

Maximum number of nodes

Single network ≤ 32, supports cascading expansion

Scalable to more nodes through fiber optic switches

Operating Temperature

-40℃~85℃

Industrial grade wide temperature design, suitable for harsh environments

Power supply requirements

VME standard power supply,+5V/± 12V

Power consumption ≤ 15W, low-power design

Redundancy feature

Optional dual fiber channel redundancy

Automatic fault switching, switching time ≤ 1 μ s

Installation and configuration points

4.1 Installation specifications

-Mechanical installation requires inserting the module into a 3U or 6U chassis slot that complies with the VMEbus specification, ensuring that the module is tightly attached to the chassis rail and secured with fixing screws to prevent poor contact caused by vibration; The installation environment should maintain good ventilation and avoid being adjacent to modules with high heat generation to ensure smooth heat dissipation.

-Before connecting optical fibers, the interface end face needs to be cleaned, and dedicated optical fiber jumpers should be used to connect each node module according to the network topology. Single mode and multi-mode optical fibers cannot be mixed; When connecting, pay attention to distinguishing between the transmit (TX) and receive (RX) interfaces to avoid communication interruption caused by reverse connection.

-During the electrical safety installation process, it is necessary to ensure that the system is powered off to avoid circuit damage caused by live plugging and unplugging modules; The module grounding needs to be reliable and connected to the system grounding grid to reduce the impact of electromagnetic interference.

4.2 Configuration Process

-The basic parameter configuration is controlled by the VME bus master node, and GE specific configuration software (such as VMIC reflection memory configuration tool) is used to configure the parameters of each node module, including transmission rate, memory address mapping range, node ID, etc., to ensure that all node parameters are consistent.

-The synchronization mechanism configuration selects the synchronization method according to system requirements, supports external clock synchronization (such as IRIG-B code) or internal self synchronization, configures the synchronization signal input interface and synchronization period, and ensures the time consistency of multi node data access.

-Redundant configuration (optional) If dual fiber channel redundancy is used, the redundancy function needs to be enabled in the configuration software, and the priority and fault switching conditions of the primary and backup channels need to be set. After completion, a channel switching test should be conducted to verify the effectiveness of the redundancy function.