PCI-E (peripheral component interconnect express) to PCI bridge device and method for actively prefetching data thereof

Abstract

The invention provides a PCI-E (peripheral component interconnect express) to a PCI bridge device and a method for actively prefetching data thereof. The PCI-E to PCI bridge device comprises an active prefetching configuration interface and an active prefetching PCI-E reading generation module, wherein after a to-be-sent data is prepared by a CPU (central processing unit) but before a Buffer descriptor is set, the active prefetching configuration interface is used for receiving an initial address and the length of the to-be-sent data in a cache from the CPU; the active prefetching PCI-E reading generation module is used for acquiring the initial address and the length of the to-be-sent data from the active prefetching configuration interface and actively prefetching the to-be-sent data from CPU to the interior cache of a PCI-E to PCI bridge; and the PCI-E to PCI bridge directly responds to a request for reading the to-be-sent data in the cache which is sent from a PCI communication module and feeding back the prefetched to-be-sent data to the PCI communication module. By using the device provided by the invention, the data active prefetching can be realized and the initial addressand the length of the prefetching data in the cache can be dynamically configured.

Description

technical field [0001] The invention relates to data communication technology, in particular to a PCI-E to PCI bridge device and a method for actively prefetching data by the device. Background technique [0002] PCI (Peripheral Component Interconnect, Peripheral Component Interconnect Bus) bus has become one of the most successful bus specifications so far since it came out in 1992, and is widely used in PC / Server platforms, such as sound cards, display cards, network devices (including Ethernet, Modem) and I / O interface, etc. In the field of embedded application, such as communication, industrial control, etc., the PCI bus has also obtained a large number of applications through the CompactPCI platform. Initially, the PCI bus adopts a 33MHz operating frequency and 32-bit data / address multiplexing bus mode. In this case, the theoretical maximum bandwidth of the bus is 1.056Gbps. With the introduction of the PCI V2.2 standard, the PCI bus is allowed to work at a frequency ...

AI Technical Summary

Problems solved by technology

[0033] The invention provides a PCI-E to PCI bridge device and a method for actively prefetching data for the device, aiming to solve the problem of PCI-E to PCI bridge compatibility with old PCI communication modules in the field of data communication, and the transmission performance of PCI communication modules The problem of sharp decline

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