VMIC VMIPMC-5565 Reflective Memory PMC Module – VMEbus
The VMIC VMIPMC-5565 is a high-performance reflective memory module in the PMC (PCI Mezzanine Card) form factor, designed for use with VMEbus systems. This module enables high-speed, deterministic data sharing between multiple nodes in a distributed system, with automatic memory replication across all connected nodes. When paired with a VME carrier card, the VMIPMC-5565 provides a powerful solution for real-time control, simulation, and data acquisition applications.
Reflective memory technology allows any write to the local memory to be automatically propagated to all other nodes in the network with extremely low latency, eliminating the need for complex software communication protocols and offloading the host CPU. The VMIPMC-5565 is ideal for applications where multiple processors or systems need to share a common, real-time data pool.
Key Features
Reflective Memory Architecture: Automatic data replication across all network nodes.
High-Speed Operation: Supports data rates up to 170 MB/s or more.
Low Latency: Typical propagation delays of less than 1 microsecond.
PMC Form Factor: Standard PMC module for integration with VME carrier cards.
VMEbus Compatibility: Designed for use with VME-to-PMC adapters.
Scalable Network: Supports up to 256 nodes in multi-drop or daisy-chain topology.
Diagnostic Features: Built-in error detection and network status monitoring.
Technical Specifications
The VMIPMC-5565 features onboard reflective memory, typically ranging from 128 MB to 512 MB. Data transfers are performed using hardware DMA engines that offload the host CPU. The module supports fiber-optic or copper interconnect options, providing flexibility for distance and noise immunity requirements.
As a PMC module, it conforms to IEEE P1386.1 PMC standard, with a standard 64-pin connector for interfacing with VME carrier cards. Power is derived from the PMC connector.
Applications
Distributed Control: Real-time synchronization of multiple VME controllers.
Simulation Systems: Sharing state data between multiple simulation nodes.
Data Acquisition: Merging data from multiple acquisition systems.
Test and Measurement: Coordinating distributed test instruments.
Radar and Sonar Processing: Sharing processed data across multiple boards.
Integration and Configuration
The VMIPMC-5565 is installed on a VME carrier card. Each node is assigned a unique ID, and the network topology is configured via software. Once initialized, memory writes are automatically replicated to all nodes. Drivers for VxWorks, Linux, and Windows are available.
Benefits
Real-Time Performance: Deterministic, low-latency data sharing.
Reduced CPU Load: Automatic data replication offloads the host processor.
Scalability: Easily expand the network to include more nodes.
Flexibility: Fiber or copper options suit distance and environmental constraints.
Conclusion
The VMIC VMIPMC-5565 reflective memory PMC module provides a powerful, efficient solution for high-speed data sharing in VMEbus-based distributed systems.
