GE VMIVME-5565 Reflective Memory Node Card

The VMIVME-5565 serves as a high-performance VMIVME-5565 Reflective Memory Node Card designed to establish deterministic, real-time data sharing across distinct computing nodes over a fiber-optic network loop. Configured as a high-speed, multi-layered VMEbus plug-in card, this device enables a shared-memory architecture across multiple independent computers or PLCs. By running frame-packing and auto-replication algorithms natively at the hardware tier, it updates identical 128 MB local memory pools across all connected network nodes parallel to local processor execution cycles.

Hardware Specifications

Real-Time Reflective Memory Architecture

• Deterministic Shared-Memory Ring Dynamics The VMIVME-5565 shares data across a high-speed fiber optic ring or star topology. When a local host processor writes data to a specific register location within the local 128 MB memory bank, the onboard logic immediately packetizes that data block and broadcasts it over the fiber optic line. Every adjacent node card on the network catches the data frame, copies the updated variables into its own local memory array at identical offsets, and passes the packet down the line with minimal propagation delay.
• Hardware-Tier Interrupt Infrastructure To support hard real-time systems, the board features integrated interrupt generation hardware. When a specific memory register is modified by a remote system, the local node card triggers a physical hardware interrupt to its host CPU. This capability allows the system to respond immediately to critical parameter changes across the network, completely bypassing the software polling bottlenecks that degrade performance in standard industrial Ethernet networks.

Frequently Asked Questions

Q: What specific hardware behaviors occur if a fiber optic link breaks or experiences severe signal loss in the reflective memory ring?

A: The onboard fiber optic transceiver detects the carrier frequency failure and sets an unmasked link-error status bit. The card instantly trips a local fault indicator LED and throws a network loss interrupt to the host system. Depending on the network configuration, the ring must be routed via a redundant hub or the loop will segment, trapping data propagation within the surviving network fragments.

Q: Can this 1.50 lbs VMEbus reflective memory card be safely hot-swapped while the VME chassis backplane is powered?

A: No. Standard VMEbus specifications do not support live card extraction unless the chassis is specifically designed with special live-insertion subracks. Pulling this module while the 5V/3.3V DC power lines are energized can cause transient bus shorts, risking electrical damage to the onboard memory controllers and corrupting parallel operations on adjacent CPU cards.