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<title>System on module</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">System on module</span></span>

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<p>A <b>system on a module</b> (<b>SoM</b>) 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="Embedded_systems" class="mw-redirect" title="Embedded systems">embedded systems</a>. Unlike a <a href="Single-board_computer" title="Single-board computer">single-board computer</a>, a SoM serves a special function like a <a href="System_on_a_chip" title="System on a chip">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.

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<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>The acronym <i>SoM</i> has its roots in the blade-based modules. In the mid 1980s, when <a href="VMEbus" title="VMEbus">VMEbus</a> blades used <a href="M-Module" title="M-Module">M-Modules</a>,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> 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 used extensively by <a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a>, <a href="Motorola" title="Motorola">Motorola</a>, <a href="Xerox" title="Xerox">Xerox</a>, <a href="Digital_Equipment_Corporation" title="Digital Equipment Corporation">DEC</a>, and <a href="IBM" title="IBM">IBM</a> in their blade computers.

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<div class="mw-heading mw-heading2"><h2 id="Design">Design</h2></div>

<p>A typical SoM consists of:

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<ul><li>at least one <a href="Microcontroller" title="Microcontroller">microcontroller</a>, <a href="Microprocessor" title="Microprocessor">microprocessor</a> or <a href="Digital_signal_processor" title="Digital signal processor">digital signal processor</a> (DSP) core

<ul><li><a href="Multi-processor_system-on-chip" class="mw-redirect" title="Multi-processor system-on-chip">multiprocessor systems-on-chip</a> (MPSoCs) have more than one processor core</li></ul></li>

<li><a href="Memory" title="Memory">memory</a> blocks including a selection of <a href="Read-only_memory" title="Read-only memory">ROM</a>, <a href="Random_access_memory" class="mw-redirect" title="Random access memory">RAM</a>, <a href="EEPROM" title="EEPROM">EEPROM</a> and/or <a href="Flash_memory" title="Flash memory">flash memory</a></li>

<li>timing sources</li>

<li>industry standard <a href="Communication_protocol" title="Communication protocol">communication</a> interfaces such as <a href="Universal_Serial_Bus" class="mw-redirect" title="Universal Serial Bus">USB</a>, <a href="FireWire" class="mw-redirect" title="FireWire">FireWire</a>, <a href="Ethernet" title="Ethernet">Ethernet</a>, <a href="USART" class="mw-redirect" title="USART">USART</a>, <a href="Serial_Peripheral_Interface_Bus" class="mw-redirect" title="Serial Peripheral Interface Bus">SPI</a>, <a href="I%C2%B2C" title="I²C">I²C</a></li>

<li>peripherals including <a href="Counter_(digital)" title="Counter (digital)">counter</a>-timers, real-time <a href="Timer" title="Timer">timers</a> and <a href="Power-on_reset" title="Power-on reset">power-on reset</a> generators</li>

<li><a href="Analog_signal" title="Analog signal">analog</a> interfaces including <a href="Analog-to-digital_converter" title="Analog-to-digital converter">analog-to-digital converters</a> and <a href="Digital-to-analog_converter" title="Digital-to-analog converter">digital-to-analog converters</a></li>

<li><a href="Voltage_regulator" title="Voltage regulator">voltage regulators</a> and <a href="Power_management" title="Power management">power management</a> circuits</li></ul>

<ul><li><a href="CompactPCI" title="CompactPCI">CompactPCI</a> – Computer bus interconnect for industrial computers</li>

<li><a href="Futurebus" title="Futurebus">Futurebus</a> – Universal computer bus standard</li>

<li><a href="PCI_Mezzanine_Card" title="PCI Mezzanine Card">PCI Mezzanine Card</a> – Printed circuit board assembly manufactured to the IEEE P1386.1 standard</li>

<li><a href="VPX" title="VPX">VPX</a> – Standards for connecting components of a computer</li>

<li><a href="VXS" title="VXS">VXS</a> – VMEbus performance improvement standard</li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://standards.ieee.org/ieee/1386/2076/">"IEEE 1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC"</a>. <i><a href="IEEE" class="mw-redirect" title="IEEE">IEEE</a></i>.</cite></span>

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<li><a rel="nofollow" class="external text" href="https://standards.ieee.org/ieee/1386/2076/">1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC</a></li>

<li>Standard ANSI/VITA 46.0-2007</li>

<li><a rel="nofollow" class="external text" href="http://opensystemsmedia.com/hall-of-fame/vita-technologies/pci-mezzanine-cards">VITA Technologies Hall of Fame - PCI Mezzanine Cards</a></li></ul>

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This article is issued from <a class="external text" title="Last edited on 2024-08-29" href="https://en.wikipedia.org/wiki/?title=System_on_module&oldid=1242929956">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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