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Reference.org
System on module
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<p>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 <a href="/facts/Embedded_systems/a4muX1wU">embedded systems</a>. Unlike a <a href="/facts/Single-board_computer/JaBPWTKF">single-board computer</a>, a SoM serves a special function like a <a href="/facts/System_on_a_chip/1RVvVe6N">system on a chip</a> (SoC). The devices integrated in the SoM typically requires a high level of interconnection for reasons such as speed, timing, bus width, etc. 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. </p>