PMC – PCIe Mezzanine Card
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In my line of work it is not unusual to be asked to fit multiple expansion cards into a small chassis. Sometimes, there is just not room for everything a customer wants. Out comes a spreadsheet, and up go the costs, as a solution is available – PCI mezzanine cards. I have had good experiences with the Dynamic Engineering card shown below. It has holes for cooling fans which can be a necessity when stuffing a relatively small portable full of cards. They can be a bit noisy (love big fans – hate small fans!) but at least they are there as an option.
IEEE P1386.1 Standard
A PCI Mezzanine Card or PMC is a printed circuit board manufactured to the IEEE P1386.1 Standard. PMC carrier cards plug into a PCI or PCIe slot in the backplane or motherboard of the rugged computer. They have mezzanine connectors on them that allow one or two ‘daughter’ cards to attach. These daughter cards – the PMC cards – are 75mm x 150mm x 8.2mm (max). These mezzanine connectors are 1.0 mm pitch 64 pin connectors as described in IEEE 1386.
CMC Standard – Common Mezzanine Card
Mezzanine cards designed to the IEEE P1386 standard can be used interchangeably on VME64 boards, Multibus I and II boards, and PCI and PCIe based computers. Mezzanine cards are available from multiple manufacturers: ADLINK, Dynamic Engineering, Kontron
Example PMC Cards:
Additional PMC information and links
FPGA mezzanine cards – Vita 57 standard
Pentek pdf on history of PMC standards: Pentek primer