or Switched Mezzanine Card
is a PMC with high-speed serial fabric interconnect, defined by the VITA 42 standard. XMC specifies a fifth connector that supports PCI Express and other high speed serial formats. XMC cards are very popular, thanks to the introduction of advanced functions; using FPGA-based processors for I/O functions, and the migration of I/O from parallel to serial interfaces. Most new generation VME, VXS or VPX CPU or DSP format hosts are likely to have one or more XMC mezzanine sites.
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