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

Abstract

The invention reveals a method for quickly selecting a pre-emphasis parameter of a high-speed serdes, and the method comprises the steps: enabling testing equipment to be in butt joint with the high-speed serdes through an optical module; adjusting the parameter setting of the optical module and a receiving end of the high-speed serdes; enabling a high-speed serdes with a to-be-adjusted pre-emphasis parameter to be in butt joint with a high-speed serdes with an adjusted pre-emphasis parameter through an optical module; determining a value range of the pre-emphasis parameter; sequentially selecting a group of parameters in the value range, and configuring the group of parameters to the to-be-adjusted high-speed serdes; enabling the to-be-adjusted high-speed serdes to transmit a random binary sequence message; carrying out the pseudo random binary sequence message inspection at the receiving end of the adjusted high-speed serdes; recording the group of pre-emphasis parameters if the inspection is passed, or else, carrying out no recording till all pre-emphasis parameters are scanned and all pre-emphasis parameters passing the pseudo random binary sequence message inspection are recorded; and selecting the middle group of optimal pre-emphasis parameters from all pre-emphasis parameters. The method effectively eliminates attenuation and crosstalk generated by the transmission of a high-speed electric signal in a 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 different. It’s not the same, relying on manual debugging is time-consuming, labor-intensive, and inefficient, and an expensive oscilloscope is required to see the effect of the eye diagram, which requires high cost to debug the pre-emphasis parameters

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