DC balanced 7B/8B, 9B/10B, and partitioned DC balanced 12B/14B, 17B/20B, and 16B/18B transmission codes

Year	Description
2002	Invention patented by Albert X. Widmer on March 4th, 2002. Abstract: The present invention provides techniques for classifying disparities and source vectors for 7B/8B and 9B/10B transmission codes, which are then used to minimize the complexity of decoding and encoding for 16B/18B codes. The classifications are determined for source vectors and for disparity for coded vectors. The vector classifications are selected in a predetermined manner so that the number of classifications is minimized for bit mapping, disparity control, or both. Additionally, the number of bits changed for bit mapping is minimized. Decoding of 7B/8B and 9B/10B transmission codes is performed by converting coded vectors into a single image and then performing decoding operations to decode the single image of the coded vectors. The single image is a primary coded vector, and an alternate coded vector is an inverted version of the primary coded vector. Techniques are presented for using 5B/6B, 7B/8B and 9B/10B transmission codes in other transmission codes such as 12B/14B and 17B/20B transmission codes. A 17B/20B may be created by using two parallel 9B/10B decoders or by using one 7B/8B encoder and two 5B/6B encoders.
Source: selected by the editor from original sources.

Invention: DC balanced 7B/8B, 9B/10B, and partitioned DC balanced 12B/14B, 17B/20B, and 16B/18B transmission codes