computer on module (CoM)
Computer-on-Modules(CoM) are computer modules that are plugged into a carrier board. They consist of a processor, memory and processor peripherals and are optimized for specific industrial applications. The concept could only be implemented consistently with the development of powerful, space- and energy-saving processors.
The cost reduction associated with the CoM concept through the production of large quantities plays a role in the new developments, as does the simpler realization of the processor buses. The high data rates can be handled much more easily on a computer-on-module. All functional units relevant to the computer, such as the central processing unit( CPU), the memories and the chipset, are located on the CoM board. Functional units for special functions are outsourced and located on a customer-specific printed circuit board.
The concept of CoM modules, their form factor, board size, connection technologies, interfaces and transmission technologies to the carrier board, are determined by the CoM module and are geared towards industrial applications. Since there are unlimited variant possibilities for this, one tries to stop the uncontrolled growth by agreements and the PICMG standards. This includes that different CoM modules combine the known bus systems, the PCIbus and the ISA bus, others use the PCI Express. CoM modules that support both bus systems include PCI Industrial Computer Manufacturers Group (PICMG), PISA and PC/104.
Other well-known module formats of COM boards that work with the PCI bus or PCI Express are the PMC module, ESM module, M module, IP module, COM Express, XTX and ETXplus. Furthermore, Qseven, µQseven, ETX modules, microETX, COM-HPC, microETXexpress and SMARC(Smart Mobility Architecture) from the Standardization Group for Embedded Technologies e.V.( SGET). These are small form factor CoM modules with Atom processor, Cortex processor, Celeron and Pentium for compact low- power systems.