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Typical SoC use in a system on a module circuit board

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 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.^{[further explanation needed]}

History

The acronym SoM has its roots in the blade-based modules. In the mid 1980s, when VMEbus blades used M-Modules,^[1] these were commonly referred to as system On a module (SoM).^{[citation needed]} These SoMs performed specific functions such as compute functions and data acquisition functions. SoMs were used extensively by Sun Microsystems, Motorola, Xerox, DEC, and IBM in their blade computers.

Design

A typical SoM consists of:

at least one microcontroller, microprocessor or digital signal processor (DSP) core
- multiprocessor systems-on-chip (MPSoCs) have more than one processor core
memory blocks including a selection of ROM, RAM, EEPROM and/or flash memory
timing sources
industry standard communication interfaces such as USB, FireWire, Ethernet, USART, SPI, I²C
peripherals including counter-timers, real-time timers and power-on reset generators
analog interfaces including analog-to-digital converters and digital-to-analog converters
voltage regulators and power management circuits

References

^ "IEEE 1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC". IEEE.

ANSI/IEEE Std 1014-1987 and ANSI/VITA 1-1994
1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC
Standard ANSI/VITA 46.0-2007
VITA Technologies Hall of Fame - PCI Mezzanine Cards

[1] "IEEE 1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC". IEEE.

[1]

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+{{short description|Board-level circuit that integrates a system function in a single module}}
-{{Multiple issues|
 {{more footnotes|date=December 2016}}
-{{Cleanup bare URLs|date=November 2019}}
-}}
-[[Image:ARMSoCBlockDiagram.png|right|275px|thumbnail|Typical SoC use in a System on a Module circuit Board]]
-[[File:SOMblk.png|thumbnail|SOM Block diagram example]]
+[[Image:ARMSoCBlockDiagram.svg|right|275px|thumbnail|Typical SoC use in a system on a module circuit board]]
-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.{{explain|date=September 2018}}
+[[File:SOMblk.png|thumbnail|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 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.{{explain|date=September 2018}}
 == History ==
-The acronym ''SOM'' has its roots in the blade-based modules. In the mid 1980s, when [[VMEbus]] blades used mezzanine modules,<ref>http://standards.ieee.org/findstds/standard/1386-2001.html</ref> 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|date=May 2019|reason=Two of these companies no longer exist}} extensively used by [[Sun Microsystems]], [[Motorola]], [[Xerox]], [[Digital Equipment Corporation|DEC]], and [[IBM]] in their blade computers.
+The acronym ''SoM'' has its roots in the blade-based modules. In the mid 1980s, when [[VMEbus]] blades used [[M-Module]]s,<ref>{{Cite web|url=https://standards.ieee.org/ieee/1386/2076/|title=IEEE 1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC|website=[[IEEE]]}}</ref> these were commonly referred to as system On a module (SoM).{{cn|date=May 2022}} These SoMs performed specific functions such as compute functions and data acquisition functions. SoMs were used extensively by [[Sun Microsystems]], [[Motorola]], [[Xerox]], [[Digital Equipment Corporation|DEC]], and [[IBM]] in their blade computers.
 == Design ==
-A typical SOM consists of:
+A typical SoM consists of:
 * at least one [[microcontroller]], [[microprocessor]] or [[digital signal processor]] (DSP) core
@@ Line 22: / Line 21: @@
 * industry standard [[Communication protocol|communication]] interfaces such as [[Universal Serial Bus|USB]], [[FireWire]], [[Ethernet]], [[USART]], [[Serial Peripheral Interface Bus|SPI]], [[I²C]]
 * peripherals including [[counter (digital)|counter]]-timers, real-time [[timer]]s and [[power-on reset]] generators
-* [[Analog signal|analog]] interfaces including [[Analog to digital converter|ADC]]s and [[Digital to analog converter|DAC]]s
+* [[Analog signal|analog]] interfaces including [[analog-to-digital converter]]s and [[digital-to-analog converter]]s
 * [[voltage regulator]]s and [[power management]] circuits
-== Applications ==
-* [[Blade server]]s
-* [[Storage blade]]s
-* [[Medical device]]s
-* [[Data acquisition]]
-* [[Network appliance]]s
-* [[Internet of things]]
-*[[Edge computing]]
 == See also ==
+* {{anl|CompactPCI}}
+* {{anl|Futurebus}}
-* [[VPX]]
+* {{anl|PCI Mezzanine Card}}
-* [[VXS]]
+* {{anl|VPX}}
-* [[CompactPCI]]
+* {{anl|VXS}}
-* [[Futurebus]]
-* [[PCI Mezzanine Card]]
 == References ==
 {{Reflist}}
+{{refbegin}}
 * [[American National Standards Institute|ANSI]]/IEEE Std 1014-1987 and ANSI/VITA 1-1994
-* [http://standards.ieee.org/findstds/standard/1386-2001.html  1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC]
+* [https://standards.ieee.org/ieee/1386/2076/  1386-2001 - IEEE Standard for a Common Mezzanine Card Family: CMC]
 * Standard ANSI/VITA 46.0-2007
-* http://opensystemsmedia.com/hall-of-fame/vita-technologies/pci-mezzanine-cards
+* [http://opensystemsmedia.com/hall-of-fame/vita-technologies/pci-mezzanine-cards VITA Technologies Hall of Fame - PCI Mezzanine Cards]
+{{refend}}
 [[Category:Microcomputers]]