COM EXPRESS:

The Concept
Customer demand for small, high performance computer modules is strongly increasing. For this reason, congatec AG, some large customers and two additional embedded computer manufacturers decided to create the miniaturized “COMPACT” computer module based on the COM Express connector and signal definition.

Size
The newly defined Compact module features all the functions of the Basic module/type 2 connector layout but reduces the size to 95x95 mm². The PICMG has already defined two module sizes: the Basic module (125x95 mm²) and the Extended module (155x110 mm²). The primary difference between the Basic module and the Extended module is the overall physical size and the performance envelope supported by each. The Extended module is bigger and can support more power consuming processors and chips with larger footprints. The Compact module, the Basic module and the Extended module use the same connectors and pin-outs and utilize several common mounting hole positions.

Compatibility
A high level of compatibility allows that a carrier board designed to accommodate a Basic module can also support a Compact module. The Type 2 connector layout is available for all board sizes. It defines 440 interconnect pins between the COM Express module and the carrier board. Legacy buses such as PCI, parallel ATA and LPC are supported along with new serial high speed interfaces such as PCI Express, Serial ATA and Gigabit Ethernet.
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Com Express Modules: