CompactPCI

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A CompactPCI (cPCI) system is a 3U or 6U Eurocard-based industrial computer, where all boards are connected via a passive PCI backplane. The pin assignments of the connectors are documented in standards, published by the organisation PICMG US and PICMG Europe. PICMG stands for PCI Industrial Computers Manufacturers Group. The connectors and the electrical rules allow for 8 boards in a PCI segment. Multiple segments are allowed with bridges.

Unlike the original Eurocards, which use connectors with a 0.1-inch pin spacing, CompactPCI cards use metric connectors with a 2-millimetre pin spacing, designed to the IEC 1076 standard. 3U cards have a 220-pin connector called J1, which carries the 32-bit PCI bus signals, and an optional 220-pin connector called J2, which carries either user-defined I/O or the upper 32-bits of an optional 64-bit PCI bus. 6U cards have an identical J1, a J2 that is always used for 64-bit PCI, as well as J3, J4, and J5 connectors for user-defined I/O.


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