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input/output bus (I/O)

I/O buses are used to connect the central processing unit and the main memory with secondary memories, peripheral devices and plug-in cards. All data that is read in by the input devices and output by the output devices runs via the I/O bus.

The I/O bus is located on the main board and consists of one or more parallel lines for data, address data, and clock signals and control information.

Overview of the I/O bus systems

Overview of the I/O bus systems

The I/O bus is an extension of the system bus that terminates on the motherboard in a controller chip and forms a connection to the I/O bus. It has a lower clock frequency than the system bus. The best known I/O buses are ISAbus, EISA bus, PCI bus, AGP bus and the USB interface as well as the HyperTransport on printed circuit boards.

Informations:
Englisch: input/output bus - I/O
Updated at: 25.04.2017
#Words: 144
Links: central processing unit (CPU), main memory, plug-in, data, output devices
Translations: DE
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