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Typical SoC use in a System on a Module circuit Board
SOM Block diagram example

A system on a module (SOM) is a board-level circuit that integrates a system function in a single module. It may integrate digital and analog functions on a single board. A typical application is in the area of embedded systems. Unlike a single-board computer, a SOM serves a special function like a system on a chip (SoC). The device integrated in the SOM typically requires a high level of interconnection for reasons such as speed, timing, bus-width etc., in a highly integrated module. There are benefits in building a SOM, as for SoC; one notable result is to reduce the cost of the base board or the main PCB. Two other major advantages of SOMs are design-reuse and that they can be integrated into many embedded computer applications.[further explanation needed]



The acronym SOM has its roots in the blade-based modules. In the mid 1980s, when VMEbus blades used mezzanine modules,[1] these were commonly referred to as System On a Module (SOM). These SOMs performed specific functions such as compute functions and data acquisition functions. SOMs were and still are[when?] extensively used by Sun Microsystems, Motorola, Xerox, DEC, and IBM in their blade computers.


A typical SOM consists of:


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