Peripheral Component Interconnect definition hardware
(PCI) A standard for connecting peripherals
to a personal computer
, designed by Intel
and released around Autumn 1993. PCI is supported by most major manufacturers including Apple Computer. It is technically far superior to VESA
's local bus
. It runs at 20 - 33 MHz and carries 32 bits at a time over a 124-pin connector or 64 bits over a 188-pin connector. An address is sent in one cycle followed by one word of data (or several in burst mode).
PCI is used in systems based on Pentium
, Pentium Pro
, AMD 5x86, AMD K5 and AMD K6 processors, in some DEC Alpha
systems, and probably Cyrix 586 and Cyrix 686 systems. However, it is processor independent and so can work with other processor architectures as well.
Technically, PCI is not a bus but a bridge
. It includes buffers to decouple the CPU
from relatively slow peripherals and allow them to operate asynchronously.