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#REDIRECT [[System bus]]
{{Orphan|date=February 2009}}
{{merge to|Von Neumann architecture|discuss=Talk:System bus model#PROD|date=October 2010}}
{{merge to|System bus|discuss=Talk:System bus model#Merge to System Bus|date=May 2011}}
[[Image:Computer system bus.png|thumb|right|400px]]
The '''system bus model''' is a streamlined version of the [[Von Neumann architecture|von Neumann model]] of computer architecture.<ref>{{cite book |title=The essentials of computer organization and architecture |author1=Linda Null |author2=Julia Lobur |publisher=Jones & Bartlett Learning |year=2006 |isbn=9780763737696 |edition=2}}</ref> Its main feature is that it interconnects the processor, memory, and I/O subsystems by a single [[bus (computing)|bus]], divided in 3 components: [[data bus]], [[address bus]], [[control bus]].<ref name="POCA"/> Contemporary computer systems use several buses for cost-performance tradeoff reasons.<ref name="Stallings2009">{{cite book|author=William Stallings|title=Computer organization and architecture: designing for performance|year=2009|publisher=Prentice Hall|isbn=9780136073734|pages=66 & 87-89|edition=8th}}</ref>
==Communications==
The system bus models divides the computer into three individual subunits which are the CPU, memory and input/output. The system bus model deviates from the von Neumann model by combining the [[arithmetic logic unit]] (ALU) and the [[central processing unit]] (CPU) into a single unit.<ref name="POCA">{{cite book|first=Miles J.|last=Murdocca| coauthors=Vincent P. Heuring|year=2000|title=Principles of Computer Architecture|publisher=Prentice-Hall|id=ISBN 0-201-43664-7|pages=5}}</ref>
The system bus is composed of the [[data bus]], [[address bus]], [[control bus]], power bus and sometimes an I/O bus.<ref name="POCA"/>
The data bus is used for transfer of data between subunits while the address bus is used to transmit ___location information between units such as where the data is going or coming from.<ref name="POCA"/>
The control bus is used to provide information as to how data is being sent.<ref name="POCA"/>
The power bus is often not graphically depicted on models but is understood to exist. Furthermore, some more complex architectures may also incorporate a separate I/O bus for transfer of data between input/output devices.<ref name="POCA"/>
==References==
{{reflist}}
{{DEFAULTSORT:System Bus Model}}
[[Category:Computer architecture]]
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