Patent ID: 8175143

Claim:
Adaptive equalization circuitry comprising: an equalization function block having a first input for serial input data, a second input for controlling an equalization function of said equalization function block, and an output for equalized data; data digitization circuitry operable to convert said equalized data to digitized output data; and adaptive compensation circuitry operable to generate an adaptation control signal to apply to said second input to control said equalization function, said adaptive compensation circuitry comprising: a first loop operable to digitally extract a first reference level and a second reference level from said equalized data; a second loop operable to digitally generate said adaptation control signal from said equalized data and said first reference level; and digital processing circuitry in said first and second loops, said digital processing circuitry operable to: extract said first reference level and generate said adaptation control signal based on at least one programmed pattern; and control the output of the equalization function block based on the first reference level and the second reference level.