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Redundant Transfer Mode: The VMIPCI-5565 can optionally be placed in the redundant transfer mode by the removal of a board jumper shunt. While in the redundant transfer mode, each packet sent on the network by the transmitter is sent twice, regardless of the dynamic packet size. The receiving circuitry of each node on the network evaluates each of the redundant transfers. If no errors are detected in the first transfer, it is used to update the onboard memory and the second transfer is discarded. If, however, the first transfer does not contain an error, the second transfer is used to update the onboard memory provided it has no transmission error. In the remote chance that both redundant transfers contain an error, neither transfer is used and the data is completely removed from the network. The redundant transfer mode greatly reduces the chance that any data is dropped from the network. However, the redundant transfer mode also reduces the effective network transfer rates. The single Lword (4 byte) transfer rate drops to approximately 20MB/s. The 16 Lword (64 byte) transfer rate drops to the redundant rate of 87MB/s.
There is a bit in a Status Register that can be used to verify that data is traversing the ring (that is, the ring is not broken). This can also be used to measure network latency. VMISFT-RFM2g Network and Shared Memory Driver: The VMISFT-RFM2g network and shared memory driver provides an applications program with three convenient methods for exchanging data among hosts connected to the same RFM network: 1) Programmed I/O (Peek and Poke): An applications program can treat the memory on the RFM device as ordinary memory in which the program can use ordinary load and store accesses. 2) DMA: On systems where the performance penalty for individual bus accesses is unacceptably high, the driver utilizes the DMA feature available on some RFM devices in order to transfer data in variable-sized blocks. On UNIX systems, an applications program uses the familiar 1seek(2)/read(2)/write(2) system calls to perform the data movement, while on other operating systems a GE Fanuc Embedded Systems-provided application program interface (API) is used for data movement. 3) User Interrupts: The VMIPCI-5565 provides three network interrupts. Any processor can generate an interrupt on any other node on the network. In addition, any processor can generate an interrupt on all nodes on the network with a single register write.