Method and a device for taking a pre-emphasis value of a serial deserialization transmitter

Abstract

The invention discloses a method and a device for taking the pre-emphasis value of a serial deserialization transmitter. The method and the device comprise the following steps: determining a link, a model range of a corresponding receiver and at least one environmental parameter range; testing the transmitter under test by all respective receivers in the model range of the respective receiver in an environment in which at least one environmental parameter is at an upper / lower limit to obtain an upper / lower limit pre-emphasis window. The pre-emphasis value is determined from the upper pre-emphasis window and the lower pre-emphasis window. The technical proposal of the invention can test the pre-emphasis value for different transmitters or different types of transmitters, thereby saving time, improving convenience, and selecting the pre-emphasis value more effectively.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, to a method and device for obtaining a pre-emphasis value of a serial deserialization transmitter. Background technique [0002] With the improvement of the communication rate between chips, the current high-speed digital signal transmission mainly uses Serdes (serializer / deserializer) technology. Due to the loss of the transmission link, the Serdes transmitter (hereinafter referred to as the transmitter) needs to increase the high-frequency energy of the signal through pre-emphasis to compensate for the loss of the link, while the Serdes receiver (hereinafter referred to as the receiver) uses CTLE, DFE The equalizer compensates the received signal to finally obtain the ideal signal. The pre-emphasis of the Serdes transmitter and the adjustment of the equalizer parameter value of the receiver are very important for the stability of the Serdes link. The current equalizer p...

AI Technical Summary

Problems solved by technology

[0004] This eye diagram test method in the prior art can only find the optimal pre-emphasis value by testing each value of each pre-emphasis, which takes a long time; and for the case of an equalizer in the receiver, due to the signal receiving The point is behind the receiver's internal equalizer and cannot be connected to an oscilloscope. It depends on the chip where the receiver is located to support the eye diagram test function. Without this function, the eye diagram cannot be tested

For the case where the receiver does not have an equalizer, an oscilloscope can be used to test the chip pins, but the test results of the oscilloscope need to be embedded in the loss of the chip pins through a simulation program to obtain the eye diagram at the signal receiving point inside the chip receiver. This relies on chip manufacturers to provide simulation models and expensive high-speed oscilloscopes

[0005] Aiming at the problems of long time-consuming, inconvenient connection and expensive equipment in the eye diagram test method in the prior art, there is currently no effective solution

Images