Method and device for realizing redriver parameter self-adaption in PCIE 4.0 link

Abstract

The invention provides a method and a device for realizing redriver parameter self-adaption in a PCIE4.0 link, and the method comprises the following steps: setting a redriver parameter value list, and selecting a group of parameters from the redriver parameter value list as initial values; when PCIE4.0 link negotiation is carried out, enabling the redriver to operate the initial value, and enabling the BMC to read the lane marker result of the last negotiation as the initial result and store the initial result; after the time interval T, enabling the BMC to read the real-time lane margin result again and compare the real-time lane margin result with the initial result pre-stored in the step S2, and when the result becomes poor, entering the next step; enabling the BMC to take the initialvalue as a reference, traverse parameters in the redriver parameter value list according to a sequence from near to far, and verify a lane marker result under the corresponding parameter; and enablingthe BMC to select a group of parameters with the best lane margin result as the latest parameters of the redriver. The device comprises a BMC (Baseboard Management Controller) used for correcting a parameter value of a redriver according to a lane margin result; and the redriver is used for operating the parameter values corrected by the BMC. The PCIE 4.0 signal quality is monitored at regular time through the BMC, and the redriver parameter is adjusted in real time according to the change of the signal quality.

Description

technical field [0001] The server technical field of the present invention particularly relates to a method and a device for realizing redriver parameter self-adaptation in a PCIE4.0 link. Background technique [0002] In the server, the PCIE bus is fast and has a high bandwidth. It is the main IO bus connecting the CPU and various devices. With the upgrading of PCIE technology, the current rate of PCIE4.0 has reached 16Gbps, which is a great challenge to signal integrity. Challenges, stricter requirements on link loss. [0003] In the PCIE4.0 link, PCIE link negotiation will be performed between the upstream device and the downstream device, so that the TXEQ configuration of the devices at both ends is the optimal value. In an ultra-long link, a redriver will be added to the PCIE devices at both ends to compensate for the loss caused by the link. The parameters of the redriver are determined through simulation and debugging, and this value is fixed in the redriver. [000...

AI Technical Summary

Problems solved by technology

[0004] In the actual application scenario, during the negotiation process of the devices at both ends of the PCIE4.0 link, the negotiated TXEQ value will also change under different environments to adapt to the impact of environmental changes. At this time, because the redriver is It is a pure electrical device with fixed parameters. When the PCIE devices at both ends negotiate parameters, the redriver does not participate in the negotiation of the PCIE link. Therefore, the redriver cannot change the parameters to adapt to the environment.

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