Asynchronous expansion system compatible with PCI (Programmable Communications Interface) interface

Abstract

The invention discloses an asynchronous expansion system compatible with a PCI interface, which is characterized in that the asynchronous expansion system comprises a PCI riser card and a plurality of asynchronous expansion modules; the PCI riser card comprises a PCI controller set into a multi-function device, an asynchronous interface controller and an asynchronous interface; the asynchronous expansion modules respectively comprises a first asynchronous interface and a second asynchronous interface which are electrically connected to the asynchronous interface of the PCI riser card through the first asynchronous interface after mutually connecting in series; the PCI controller is used to set the numbers of each asynchronous expansion module; the resource setting of each asynchronous expansion module is obtained through the asynchronous interface controller; and the corresponding address resources are set and allocated according to the resources of each asynchronous expansion module so that the corresponding PCI configuration space is allocated to the corresponding asynchronous expansion module and the PCI controller successfully carries out a signal conversion program when an operation system carries out a scanning program.

Description

technical field [0001] The invention relates to a PCI expansion interface, in particular to an asynchronous expansion module for a single multifunctional PCI interface. Background technique [0002] With the rapid development of computer technology, computer peripheral and interface technology has also evolved rapidly, from the early ISA interface and ISA interface for XT / AT computers to the current plug-and-play and high-bandwidth PCI interface. [0003] Generally speaking, the PCI local bus of the computer motherboard has high expandability, supports up to 256 buses, and each bus can connect multiple PCI devices; moreover, each PCI device can support 8 PCI functions (Functions), in short, the PCI device can be regarded as 8 effective PCI devices by the computer through setting; the setting method is that the PCI device provides two types of setting functions, one is a single-function PCI device (Signal Function Device); the other is a multi-function PCI device (Muti-Funct...

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Problems solved by technology

[0004] However, for some special application computers, due to the original planning, only a single PCI slot can be provided, but in the later stage of application development, more PCI devices must be connected, and the entire group of computers must be replaced, or relevant operators must be invited to develop multiple PCI slots. One PCI device, but the cost of the latter is higher than replacing the whole group of computers, and the development time is long, so there is indeed a shortage of PCI slots on the computer motherboard, but more PCI devices must be connected, which makes the existing computer The host is facing the dilemma of being replaced

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