ENCODING AND DECODING METHOD AND APPARATUS FOR SERIAL COMMUNICATION SYSTEM BASED ON SERDES TECHNOLOGY

摘要

Provided are an encoding and decoding method and apparatus for a serial communication system based on SerDes technology. The method comprises an encoding step: dividing 18-bit common data into two pieces of 9-bit original data; respectively using the two pieces of original data as the initial address N of two code look-up tables, and converting the initial addresses N into 2*N+0 and 2*N+1 as the input address of the code look-up table; outputting a first code word and a second code word comprising imbalance information according to the input addresses, the number of '1' in the first code word being larger than or equal to the number of '0', and the number of '0' in the second code word being larger than or equal to the number of '1'; outputting a selection indication signal according to the motion polarity difference value of a current code stream; and selecting a code word from the first code word and second code word output by each look-up table according to the selection indication signal to form a next output code word. The decoding process of the scheme is the inverse process of encoding, and the implementation method is similar to the encoding process. The present invention achieves the target of direct current balance of the output code stream, and at the same time, improves the transmission performance.