A Method for Polarity Restoration of Serial Communication Data Based on Asymmetric K Code Codec

Abstract

The present invention provides a serial communication data polarity recovery method for asymmetric K-code encoding and decoding, comprising: performing preprocessing on the data stream to be sent, and inserting K codes at intervals in the data stream to be sent during the processing; The stream is encoded by 8 / 10B to obtain normal encoded data; the K code is mapped to an asymmetric polar encoding, and a new data stream is formed with the remaining encoded data, and the new data stream is sent to the receiving end; at the receiving end The encoding polarity of the received data stream is detected, and the polarity-reversed data is restored; the invention solves the problem of data polarity, improves the fault tolerance of the channel, and can effectively solve the problem of polarity reversal in the high-speed Serdes data path. It can effectively correct the polarity error in the data path, and at the same time retain the DC balance characteristics of 8 / 10B encoding, especially suitable for applications that do not have high requirements for the use of control information and do not need to fully use all K code forms in standard 8 / 10B encoding Happening.

Description

technical field [0001] The invention relates to the field of computer network technology and communication, in particular to a method for restoring the polarity of serial communication data encoded and decoded by asymmetrical K codes. Background technique [0002] SERDES is the abbreviation of SERializer (serializer) / DESerializer (deserializer), which is a time-division multiplexing (TDM), point-to-point (P2P) serial communication technology, and Serdes is a general-purpose high-speed serial interface It is widely used in network applications and so on. With the continuous development of Serdes technology, higher requirements are put forward for equalizers, phase detectors, jitter tolerance and data clock recovery capabilities. How to reduce the transmission bit error rate as much as possible and reduce the phase error of the recovered clock is one of the important indicators for evaluating the performance of Serdes. [0003] However, limited by the PMA (Physical Media Ada...

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Problems solved by technology

[0003] However, limited by the PMA (Physical Media Adaptation Layer) design performance, the clock recovered by CDR (clock data recovery, clock data recovery) may have a large phase offset. If the data is encoded and decoded in Manchester, due to each There will be a level conversion in the middle of the symbol, so different sampling positions may get completely opposite sampling results, causing data polarity reversal

In addition, due to chip technology, board-level PCB wiring, vias, etc., the high-speed differential data lines connected to the PMA are reversed, and the sampling results will also show data polarity reversal.

[0004] At present, using the existing 8B / 10B codec technology itself can indirectly achieve polarity calibration, that is, by sending a specific sequence for codec processing, and comparing and detecting the recovered data with the sent data to judge the data polarity. Real-time monitoring of data polarity requires regular insertion of specific data code groups for inspection, which occupies effective data bandwidth resources and further increases design complexity, and will interrupt normal data transmission, making it difficult to continuously perform polarity detection and calibration

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