GE VMIVME-5576 is a high-performance, multidrop VME-to-VME network. Data is transferred by writing to on-board global RAM. The data is automatically sent to the location in memory on all Reflective Memory boards on the network.The Reflective Memory concept provides a very fast and efficient way of sharing data across distributed computer systems. VMIC’s VMIVME-5576 Reflective Memory interfaceallows data to be shared between up to 256 independentsystems (nodes) at rates up to 6.2 Mbyte/s. Each ReflectiveMemory board may be configured with 256 Kbyte to 1 Mbyteof on-board SRAM. The local SRAM provides fast Readaccess times to stored data. Writes are stored in local SRAMand broadcast over a high-speed fiber-optic data path to otherReflective Memory nodes. The transfer of data between nodesis software transparent, so no I/O overhead is required.Transmit and Receive FIFOs buffer data during peak datarates to optimize CPU and bus performance to maintain highdata throughput.
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VMIC GE Fanuc VMIVME5576 Fiber-Optic Reflective MemoryVMIVME-5576.pdf
VMIC/GE Fanuc VMIVME5576 Fiber Optic Reflective Memory Features：
• High-speed, easy-to-use fiber-optic network (170 Mbaud serially)
• Data written to memory in one node is also written to memory in all nodes on the network
• Up to 2,000 m between nodes and up to 256 nodes
• Data transferred at 6.2 Mbyte/s without redundant transfer
• Data transferred at 3.2 Mbyte/s with redundant transfer
• Any node on the network can generate an interrupt in any other node on the network or in all network nodes with a single command
• Error detection
• Redundant transmission mode for suppressing errors
• No processor overhead
• No processor involvement in the operation of the network
• Up to 1 Mbyte of Reflective Memory
• A24:A32:D32:D16:D8 memory access
• Single 6U VMEbus board
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