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Mezzanine boards are small form factor cards designed to plug onto larger form factor boards. The larger main boards can be designed to support one or more Mezzanine boards. Not all mezzanine formats are supported by all main board formats.

Switched Mezzanine Card

XMC [VITA 42], Switched Mezzanine Card , is compatible with Compact PCI or the VME board standards, and ATCA carrier cards. The XMC board standard is based on the PMC mechanical definition, and occupies the same board area. Among the differences between XMC and PMC standards are the addition of a new set of connectors and a fabric interconnect.

The XMC board dimensions is 74mm x 149mm for single width cards, or 149mm x 149mm for double width Modules.
The XMC standard adds to the PMC specification by adding switched fabric interconnects to the existing PCI bus interface. An XMC module adds one, or optionally two, new connectors to the connectors already on a PMC. The new connectors support high-speed differential signals for fabric communications.

XMC Board manufacturers are listed on the XMC Mezzanine Card Manufacturers

XMC Standards

VITA 42.0 XMC [These are all Draft Standard for Trial Use]
VITA 42.1 XMC Parallel RapidIO Protocol Layer Standard [XMC Switched Mezzanine Card: Parallel RapidIO]
VITA 42.2 XMC Serial RapidIO Protocol Layer Standard [XMC Serial RapidIO Protocol Layer Standard]
VITA 42.3 XMC PCI Express Protocol Layer Standard
VITA 42.4 XMC HyperTransport Protocol Layer Standard [Not being worked]
VITA 42.5 XMC Aurora Pin Assignments [Not being worked]
VITA 42.10 XMC General Purpose I/O Standard [Not being worked]

VITA {Standards}

Engineering Key words: Mezzanine Bus, XMC, PCI Mezzanine Card, PMC, Common Mezzanine Card, CMC Bus, Standard, Interface Standard, Specification, Spec, Electrical Interface, IC, Parallel Bus, Physical Interface, Embedded Parallel Computer Bus, Electronic connector Description, Daughter Card Component Manufacturers, Card Dimensions, Board form factor, PCB width, Mezzanine, IEEE Standards: IEEE 1386 and IEEE 1386.1, I/O schemes, Module, Carrier.

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