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8b10b

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(8Bits10Bits) A transmission code created by IBM in the mid-1980s that adds two bits to every 8-bit byte of data. The extra bits ensure that the line is electrically balanced between 0s and 1s, which enables the receiving circuits to stay in sync at high speeds. Using two conversion tables, the low-order five bits of each byte are encoded as six bits, and the next three bits are encoded into four bits.



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At the encoding layer, SAS uses 8b10b encoding to create transmission characters and primitives from bits.
The new library of SERDES components available with ADS includes 8B10B encoders/decoders; 64B66B encoders and decoders with and without scrambling; non-adaptive and adaptive feed forward and decision feedback equalizers, using a wide variety of tap optimization algorithms; and a new digital signal source capable of producing a de-emphasis waveform with random and periodic jitter modulation and transition wave shaping.
The 8b10b encoding enforces several bit transitions per 10 bits even during data transmission; clock drift is minimized by continuously tracking these transitions.
 
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