Asynchronous serial data recovery method based on 8B/10B coding

Abstract

The invention discloses an asynchronous serial data recovery method based on 8b10b coding, which mainly comprises the following steps that: 1, a sending end frames data needing to be sent, and a frame of framed data is of a synchronous code + effective data structure; 2, the sending end performs 10-bit coding on 8-bit data of each byte of one frame of data according to an 8B / 10B coding rule, takes a local clock as a serial output clock, and outputs a 10-bit data stream in a serial mode; 3, the receiving end carries out bit sampling on the 10-bit serial data flow through a local sampling clock, and when one bit is sampled, the 10-bit serial data flow is stored in a 10-bit shifting register; 4, detecting a synchronous code in the serial data stream stored in the shift register to determine that the character boundary completes 10-bit byte alignment of the current transmission frame; and 5, after 8B / 10B decoding is carried out on the aligned 10-bit data, the 10-bit data is recovered to original 8-bit data, and data recovery of the current transmission frame is completed. According to the method, data recovery can be realized only through simple logic code design, and the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an 8B / 10B coding-based asynchronous serial data recovery method. Background technique [0002] With the development of integrated circuit technology, the communication system has higher and higher requirements for data transmission rate. The early parallel transmission mode gradually exposed the I / O consistency problem due to the increase in rate, which has become a bottleneck for improving the system transmission rate. Therefore, the serial transmission system is favored by designers. In serial communication, the clock signal is embedded into the data signal through data encoding technology at the sending end, and the clock recovery technology is used at the receiving end to extract the synchronous clock signal from the data to restore the data. The timing problem caused by the delay of the transmission line is eliminated. In addition, the serial communication ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that additional hardware resources are required when the serial data at the receiving end is recovered by using special decoding chips, multi-phase clock sampling, FPGASelectIO, or the design is complex and low reliability, or high-performance FPGA devices are required, and the cost is high , the present invention provides a method for recovering asynchronous serial data based on 8B / 10B encoding

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