Conventional PCI (PCI is an initialism formed from Peripheral Component Interconnect, part of the PCI Local Bus standard and often shortened to PCI) is a local computer bus for attaching hardware devices in a computer. The PCI bus supports the functions found on a processor bus, but in a standardized format that is independent of any particular processor. Devices connected to the bus appear to the processor to be connected directly to the processor bus, and are assigned addresses in the processor's address space.
Attached devices can take either the form of an integrated circuit fitted onto the motherboard itself, called a planar device in the PCI specification, or an expansion card that fits into a slot. The PCI Local Bus was first implemented in IBM PC compatibles, where it displaced the combination of ISA plus one VESA Local Bus as the bus configuration. It has subsequently been adopted for other computer types. PCI is being replaced by PCI-X and PCI Express, but as of 2011, most motherboards are still made with one or more PCI slots, which are sufficient for many uses.
The PCI specification covers the physical size of the bus (including the size and spacing of the circuit board edge electrical contacts), electrical characteristics, bus timing, and protocols. The specification can be purchased from the PCI Special Interest Group (PCI-SIG).
Typical PCI cards used in PCs include: network cards, sound cards, modems, extra ports such as USB or serial, TV tuner cards and disk controllers. PCI video cards replaced ISA and VESA cards, until growing bandwidth requirements outgrew the capabilities of PCI; the preferred interface for video cards became AGP, and then PCI Express. PCI video cards remain available for use with old PCs without AGP or PCI Express slots.
Many devices previously provided on PCI expansion cards are now commonly integrated onto motherboards or available in universal serial bus and PCI Express versions.
Read more about Conventional PCI: History, Auto Configuration, Interrupts, Conventional Hardware Specifications, PCI Bus Transactions, PCI Bus Latency, PCI Bus Bridges, PCI Bus Signals, Development Tools
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... PCI-X revised the conventional PCI standard by doubling the maximum clock speed (from 66 MHz to 133 MHz) and hence the amount of data exchanged between the computer ... Conventional PCI supports up to 64 bits at 66 MHz (though anything above 32 bits at 33 MHz is seen only in high-end systems) and additional bus standards move 32 bits at 66 MHz or 64 bits ... the processor and peripherals with PCI-X is 1.06 GB/s, compared to 133 MB/s with standard PCI ...
Famous quotes containing the word conventional:
“The mastery of ones phonemes may be compared to the violinists mastery of fingering. The violin string lends itself to a continuous gradation of tones, but the musician learns the discrete intervals at which to stop the string in order to play the conventional notes. We sound our phonemes like poor violinists, approximating each time to a fancied norm, and we receive our neighbors renderings indulgently, mentally rectifying the more glaring inaccuracies.”
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