A method and device for low-latency 8b/10b encoding

Abstract

The invention discloses a low-delay 8B / 10B encoding method and device, which improves the traditional four-channel 8B / 10B encoder, and derives the polarity generation method according to the causal relationship of the 8B / 10B encoding table. The polarity generation part is added to the traditional multi-channel encoder, which saves a lot of waiting time between the internal channels of the traditional multi-channel encoder, improves the efficiency of parallel encoding, and reduces the encoding output delay while increasing the data transmission rate. The present invention can be simply extended to low-latency 8B / 10B encoders of any channel.

Description

technical field [0001] The invention belongs to, and in particular relates to a low-latency 8B / 10B encoding method and device. Background technique [0002] 8B data has 2 8 A total of 128 situations, including continuous '0' or '1', more '0' and less '1', less '1' and more '0', etc., resulting in DC imbalance, electromagnetic interference, and difficulty in clock recovery And other issues. In order to solve the above problems, two engineers Albert X.Widmer and Peter A.Franaszek of IBM proposed the 8B / 10B encoding and decoding method, which encodes 8B data into 10B data with an equivalent number and at least 3 jumps for data transmission. The 8B data contains two types of control characters Kx.y and data characters Dx.y. The 8B data is HGFEDCBA from high to low, and the encoded 10B data is abcdeifghj from high to low. Use RD (Running Disparity, polarity deviation value ) to reflect the balance of '0' and '1' in the data stream. There are three types of balance for 10B dat...

AI Technical Summary

Problems solved by technology

In the same way, the four-channel encoding unit inputs multiple 8B data at the same time for encoding, and in the encoding process of the next channel, it is necessary to obtain the polarity output of the previous channel to encode the correct 10B data. This dependency increases the four-channel The degree of coupling between the encoding units leads to several clock cycles after the encoding unit inputs 8B data to be encoded to obtain the correct 10B encoding output result, which increases the encoding output delay and has a great impact on parallel efficiency. influences

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