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A FPGA Mezzanine Card or FMC is a printed circuit board designed to the ANSI/VITA 57 standard. This standard describes the requirements for an I/O mezzanine module that connects to a carrier card's FPGA processing device.

The aim is to provide multiple I/O options for standard FPGA based carrier cards.

The FMC specification defines the:
 * mechanical properties of the module and carrier in sufficient detail to allow interchangeability,
 * high-speed connector,
 * electrical connectivity of the IO mezzanine module high-speed connector.

There are similarities with the standards for PMC and XMC modules. However FMC modules use a smaller form factor and assume connection to an FPGA device.

A single width FMC is upto 69 x 84 x 12.4 mm and has a single connector to the carrier.

The connector supports upto 400 pins which provides a potential overall bandwidth of 40 Gb/s between mezzanine and carrier card.

The industry's first VITA 57.1 compliant FMC module was announced in April 2008.