Initialization phase alignment method of high-speed source synchronous LVDS interface

Abstract

The invention provides an initialization phase alignment method of a high-speed source synchronous LVDS interface, and relates to the technical field of high-speed data transmission. The method comprises the following steps: judging the stability of sampled parallel data, and finding a first transition area; judging the stability of the parallel data, judging whether a cyclic shift result of a training word penetrates through the first transition area in case of sampling stability; and performing a shift operation on the parallel data until the training word is obtained, and gradually increasing the delay, judging the correctness of the parallel data, and finding a second transition area; and adjusting the delay of a data channel to a half of fan affective window length. In view of the problem that the possible fixed jitter in the transition areas is not considered in the traditional initialization phase alignment method, whether the sampling data are matched with the training word, namely the correctness, is judged in the process of penetrating through the first transition area and finding the second transition area, so the correctness of identifying left and right side edges of an effective window of a data eye pattern is improved, and thus the high reliability of the initialization phase alignment of the high-speed source synchronous LVDS interface is ensured.

Description

technical field [0001] The invention belongs to the technical field of high-speed data transmission, and in particular relates to a high-speed source synchronous LVDS interface initialization phase alignment method. Background technique [0002] The source synchronous LVDS interface is a high-speed data transmission technology widely used in the fields of current network, high-speed AD and high frame frequency CMOS detectors. It consists of a clock channel and several data channels. The clock and data at the sending end are edge-aligned, but due to various factors during the transmission process, the path length of each channel will be inconsistent, resulting in the phase relationship between the channels at the receiving end becoming unknown. A solution to this problem is to perform channel training during the initialization phase, such as figure 1 shown. The sending end continuously sends fixed training words, and the receiving end adjusts the delay of each data channel ...

AI Technical Summary

Problems solved by technology

Therefore, when the transition region contains fixed jitter, the traditional phase alignment method will confuse the transition region and the effective window, resulting in inaccurate phase alignment results, especially in the case of a particularly narrow effective window, which is very likely to cause data sampling. error, reduced reliability

Images