English: Peripheral Component Interconnect
Chinese: PCI bus, peripheral device interconnection
Introduction : It is the most widely used interface in personal computers at present, and almost all motherboard products have this kind of slot. The PCI slot is also the type of the motherboard with the largest number of slots. On the current popular desktop motherboards, the motherboard with ATX structure generally has 5 to 6 PCI slots, and the smaller MATX motherboard also has 2 to 6 PCI slots. 3 PCI slots, which shows the extensiveness of its application.
It is a local parallel bus standard introduced by PCISIG (PCI Special Interest Group). The PCI bus is developed from the ISA (Industy Standard Architecture) bus. The ISA parallel bus has two modes, 8-bit and 16-bit, with a clock frequency of 8MHz and an operating frequency of 33MHz/66MHz. Is a synchronous processor-independent 32-bit or 64-bit local bus.
From a structural point of view, PCI is a first-level bus inserted between the CPU supplier and the original system bus. Specifically, a bridge circuit realizes the management of this layer and realizes the interface between the upper and lower levels to coordinate the transmission of data. . From the establishment of the specification in 1992 to today, the ==PCI bus has become a standard bus for computers==. It has become the new standard of local bus and is widely used in current high-end microcomputers, workstations and portable microcomputers. ==Mainly used to connect graphics card, network card, sound card==. The PCI bus is a 32-bit synchronous multiplexed bus. Its address and data line pins are AD31 ~ AD0. The operating frequency of PCI is 33MHz.