Method and device for testing expansion bus of high-speed serial computer

Abstract

The invention provides a method for testing an expansion bus of a high-speed serial computer, which is applied to a controller of a high-speed serial computer expansion bus PCIE (Peripheral Component Interface Express) bus, and comprises the following steps: sending a notification message to slave equipment, so that the slave equipment closes a response function aiming at a first type of data packet; sending a plurality of first type data packets to the slave device, so that the first type data packets occupy all retransmission caches of the controller; sending a plurality of second type data packets to the slave device; and after waiting for a first preset time, verifying the priority of the second type of data packets. According to the invention, the occupation state of the link can be accurately created, and the change rule of the priority of the data packet is verified.

Description

technical field [0001] The invention relates to the technical field of processors, in particular to a high-speed serial computer expansion bus testing method and device. Background technique [0002] High-speed serial computer expansion bus PCIE bus is a widely used computer bus, which has the characteristics of point-to-point, high bandwidth and reliable transmission. The PCIE bus is generally considered to have a three-layer structure, namely the physical layer, data link layer and transaction layer. During the data transmission process of the PCIE bus, data of different layers are usually transmitted using different types of data packets. For example, the data transmission of the data link layer adopts the data link layer data packet DLLP, and the data transmission of the transaction layer adopts the transaction layer data packet TLP. Different data packets have different priorities. For example, the priority of DLLP is usually lower than that of TLP. When the higher-p...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that there are at least the following technical problems in the prior art: Although the protocol stipulates that when the data packets with higher priority continue When the link is occupied, in order to avoid the blocking of the lower priority data packets, it is necessary to increase the lower priority data packets to achieve normal transmission; however, it is difficult to create the rule of Applicable scenario, the rule cannot be verified

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