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XMC / PMC

A PCI Mezzanine Card or PMC is a printed circuit board manufactured to the IEEE P1386.1 standard. A mezzanine connector connects two parallel printed circuit boards in a stacking configuration. Although many mezzanine connector styles are commercially available for this purpose PMC mezzanine applications usually use the 1.0 mm pitch 64 pin connector described in IEEE 1386.

Carrier cards that accept PMCs are usually made in the Eurocard format, which includes single, double and triple-height VMEbus cards, CompactPCI (cPCI) cards and VPX cards. One PMC fits on a standard 3U carrier card while 6U models (typical for VMEbus cards) can carry up to two PMCs. For the PMC standard, I/O technologies account for much of the market, but various card functions are commercially available including Intel architecture and PowerPC processors, graphics cards, and memory cards. I/O cards are available such as serial communication controllers, SCSI controllers, graphics controllers and FireWire controllers.

 
Technology XMC PMC
XMC, 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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