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peripheral component interconnect (PCI)

Peripheral Component Interconnect(PCI) is an Intel specification that defines a local I/O bus where up to ten expansion cards can be plugged into a computer motherboard. The motherboard and expansion cards automatically configure themselves using autoconfiguration.

In the PCI bus, one expansion card must be a PCI controller card, which is used to exchange information with the computer's central processing unit( CPU). The advantage is that PCI units can exchange data via the controller and at the same time the central processing unit can address the memory assigned to it and perform other functions. The controller translates processor instructions, allowing processor upgrades without affecting other system components.

The first version (PCI 1.0) of the processor-independent PCI bus was based on 32-bitword length and had a clock rate of 33 MHz. This allowed a maximum transfer rate of 133 MB/s to be achieved. The later 64-bit version (PCI 2.0) achieved a maximum transfer rate of 533 MB/s at a bus frequency of 66 MHz.

PCI interface versions

PCI interface versions

To meet the increasing requirements of modern server technology, Compaq, Hewlett Packard and IBM specified the PCI-X bus, a bus with a clock rate of 133 MHz.

PCI bus structure

PCI bus structure

In the 1990s, two variants of the PCI bus were developed for industrial use: the CompactPCI( CPCI), which was used in America, and the IndustrialPCI, which was developed in Germany. With the Mini PCI bus, another variant for potables was introduced in 1998.

Informations:
Englisch: peripheral component interconnect - PCI
Updated at: 10.04.2012
#Words: 232
Links: protocol control information (PCI), bus, computer, motherboard, indium (In)
Translations: DE
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