3 COM Express™ Module sizes
3 COM Express™ Module sizes
3.1Overview - Module Size
The primary difference between the current basic module and the extended module as well as future compact footprints like microETXexpress and nanoETXexpress is the over-all physical size and the performance envelope supported by each. The extended module offers larger real estate and can accommodate larger processor, chips and memory solutions which are not possible on the basic module.
The extended module and the basic module use the same connectors and pin-outs and utilize several common mounting hole positions. This level of compatibility allows that a carrier board designed to accommodate an extended module can also support a basic module, microETXexpress or nanoETXexpress modules. This holds true for any future defined compact modules as they too will utilize the same connectors and pin-outs
Up to 440 pins of connectivity are available between COM Express™ modules and the carrier board. Legacy buses such as PCI, parallel ATA, LPC, AC'97 can be supported as well as new high speed serial interconnects such as PCI Express, Serial ATA or SAS and Gigabit Ethernet. To enhance interoperability between COM Express™ modules and carrier boards, five common signalling configurations (Pin-out Types) have been defined to ease system integration. Some Pin-out Types definitions require only a single 220-pin connector, like nanoETXexpress and others require both 220- pin connectors to supply all the defined signalling.
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Specification Rev 013
