Method for quickly selecting pre-emphasis parameter of high-speed serdes

Abstract

The present invention discloses a method for quickly selecting serdes pre-emphasis parameters. Firstly, connect a test device and high-speed serdes through an optical module, adjust the parameter settings of the optical module and the high-speed serdes receiving end, and set the high-speed serdes whose pre-emphasis parameters are to be adjusted Connect with the adjusted high-speed serdes through the optical module, determine the value range of the pre-emphasis parameters, select a set of parameters in the value range to configure the high-speed serdes to be adjusted, and then enable the high-speed serdes to be adjusted to send pseudo-random binary sequence reports In this paper, check the pseudo-random binary sequence at the receiving end of the adjusted high-speed serdes. If it passes the inspection, record the set of pre-emphasis parameters, otherwise it will not record until all the pre-emphasis parameters are scanned, and all pseudo-random binary sequences are checked. The passed pre-emphasis parameters are all recorded, and the middle group is selected as the best pre-emphasis parameters among all the parameters passed through the pseudo-random binary sequence check. The invention effectively eliminates the attenuation and crosstalk generated when the high-speed electrical signal is transmitted in the channel.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for quickly selecting high-speed serdes pre-emphasis parameters. Background technique [0002] At present, high-speed serial-to-parallel / parallel-to-serial converters (English name: serdes) are widely used in high-performance switches. Module or copper cable, this section of PCB routing will cause signal attenuation and crosstalk. The higher the signal rate, the more serious the attenuation and crosstalk. How to ensure that the high-speed signal from serdes still has good signal quality after passing through PCB routing, which is high-speed An increasingly challenging problem in serdes applications. [0003] In the prior art, in order to eliminate part or all of the attenuation and crosstalk caused by PCB walking, an effective method is to perform pre-emphasis equalization before the serdes signal is sent out. The pre-emphasis coefficient determines the si...

AI Technical Summary

Problems solved by technology

However, because a chip generally has many serdes, the PCB traces of each serdes are different, and when the chip is changed to another application, the traces of each serdes are completely different, that is, the signal attenuation and crosstalk are d

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