reflectivememory.com

What It Is

J-Squared Reflective Memory is a family of fiber-optic shared-memory hardware products for real-time distributed systems, rather than a conventional software development platform. Its core idea is to let multiple independent computer nodes each maintain the same copy of shared memory: after an application writes to local Reflective Memory, FPGA logic synchronizes the data to other nodes over a 2.12 Gbaud fiber-optic link, keeping data consistent at the same addresses across all nodes.

Core Capabilities

The product lineup covers PCIe, PCI, PMC, and VME node cards, as well as the PEAZ-5565 analyzer and the ACC/HUB-5595 managed Hub. Node cards support up to 256 nodes, with sustained transfer rates of up to 170 Mbyte/s, dynamic packet sizes of 4–64 bytes, and onboard SDRAM typically at 128MB or 256MB. The materials emphasize inter-node hardware latency as low as about 450–500ns, software-transparent transfers, and no processor involvement in network operations. Performance and reliability can be improved through DMA, FIFO, error detection, interrupts, and redundant transmission. The system supports Linux, VxWorks, and Windows, with fiber distances of 300m over multimode and 10km over single-mode fiber.

Pricing and Materials

The website does not publish pricing; all products are quoted via Request a Quote. Product briefs, white papers, and data sheets are freely accessible, but manuals, drivers, and software are restricted resources that require a request through the support portal. The team says it responds within 24 hours.

Pros and Cons

The advantages are low latency and strong determinism, making it especially suitable for real-time data acquisition, process control, advanced simulation, and distributed processing. The local memory read/write model is application-friendly and reduces I/O overhead. The Hub and analyzer also add capabilities for expansion, bypassing, monitoring, and troubleshooting. The drawbacks are that dedicated hardware typically costs more than standard LAN solutions, pricing is not transparent, development materials and drivers are restricted, API/SDK information is limited, and it offers little value to general internet or purely software developers.

Who It’s For and Access from China

It is best suited for industrial, research, simulation, or embedded system teams with hard real-time requirements and a need for deterministic shared datasets. The review text does not provide information on access from China, so it is not possible to determine whether the site can be accessed directly.