Data transmission method and data transmission system for PCI-E

Abstract

The embodiment of the invention provides a data transmission method and a data transmission system for a PCI-E (Peripheral Component Interface Express). The method can comprise the following steps of: judging whether a slave device is in an off-line state or not to obtain a first judging result; when the first judging result shows that the slave device is in the off-line state, judging whether the slave device responds to instructions of a master device or not to obtain a second judging result; and when the second judging result shows that the slave device does not respond to the instructions of the master device, sending a first response instruction to the master device so that the master device stops waiting for the response instruction sent from the slave device, wherein the first response instruction shows that the slave device is not well prepared. When the method or the system provided by the embodiment of the invention is adopted, the off-line state of the slave device can be fed back to the master device in time; and the influence time of the hot plug process of the slave device on the data processing service is reduced, so that the robustness of a PCI-E interface in the hot plug process can be improved.

Description

technical field [0001] The embodiments of the present application relate to the communication field, and in particular, relate to a data transmission method and system for PCI-E. Background technique [0002] PCI-E (Peripheral Component Interface Express, bus and interface standard) is the latest bus and interface standard. According to the protocol of the PCI-E bus, all entities on the bus that cause PCI transmission transactions can be called master devices, and entities that respond to transmission transactions can be called slave devices. The master device should have processing capability and can control the bus. That is, when a device acts as a master device, the device is equivalent to a bus master. [0003] The PCI-E interface is developed for the design of the PC. Due to its advantages of less pin occupation and high transmission rate, more and more chips on the large-capacity business processing board in the network equipment adopt the PCI-E bus. as the control ...

AI Technical Summary

Problems solved by technology

[0006] However, the data transmission method used for PCI-E in the prior art, because the process of pulling out the device from the device by lifting the handle takes a long time (much greater than 50ms), therefore, it cannot meet the requirements of the hot-plug process for data processing services. The impact is no greater than 50 milliseconds on the index

In addition, the hot-swapping process in the above-mentioned data transmission method for PCI-E may also cause interruption of data on the PCI-E bus, which in turn affects the data reception of the master device, which may cause the reset of the master device or the PCI-E interface exception

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