PCI Mezzanine card (PMC)
The PCI Mezzanine Card( PMC) is a module format for plug-on modules defined by several organizations and standardized by IEEE under P386.1.
The PMC module has dimensions of 74 mm x 149 mm, so that two of these modules can be plugged side by side into a carrier board with Multibus II, VME bus or CompactPCI. The depth of 149 mm utilizes the maximum depth of a Eurocard. The maximum component height is 9.8 mm.
The basic version of the PMC module has two 64- pin connectors, which are used for the PCI bus and the I/O signals. However, there is also a version with three 64-pin connectors.
The PMC standard defines which connector contacts are assigned to which PCI signal. In addition, 64 connector contacts are defined for input and output signals.
On the carrier board, there is a recess of 63 mm on the front side for the I/O connectors of the PMC module. This size is sufficient to equip the PMC board with four RJ45 connectors or two Sub-D connectors.
The system connectors are designed to be PCI-capable and have through-hole contacts to allow multiple modules to be stacked on top of each other. PMC modules are typically plugged onto host CPU boards. They are used for high-speed data transfer or demanding graphics solutions. M-modules are also frequently used in industrial input/output processes.