Serial interconnect interface rate increased significantly in the past few years, the rate of each line increased from 2.5 Gbit/s to 10 Gbit/s, and each interface can hold 1 to 32 lines, 8 b10b as a coding technique, and interconnection of the interface design simple, superior performance, thus become the most widely used technology, however, the system overhead is as high as 25%, outstanding problems, to solve this problem, the designers have been exploring the improved method, this article will introduce some low overhead coding technique, and discuss their advantages and existing problems,

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