US Patent 11190331 Data alignment in physical layer device

A physical layer (PHY) device comprises a phase interpolator to generate a set of sampler clocks. A sampler of the PHY device samples a calibration data pattern based on the set of sampler clocks. A data alignment system of the PHY device performs a coarse calibration and a fine calibration on the sampler clock signals. During the coarse calibration, the data alignment system moves the sampler clock signals earlier or later in time relative to the sampled data based on a first bit of the sampled data. During the fine calibration, the data alignment system moves the sampler clock signals earlier or later in time relative to the sampled data based on the first bit, a second bit, and a third bit in the sampled data.