Unequalized clock data recovery for serial I/O receiver

摘要

A serial input/output method and receiver include an receiver portion to receive an analog differential serial input and sample the input to provide data and error signals, an equalization feedback loop responsive to the data and error signals to adjust the receiver portion, a phase feedback mechanism separate from the equalization feedback loop to provide a phase error, and a clock data recovery block coupled to receive the phase error to perform timing recovery for the receiver portion independent of the equalization feedback to adjust the sampling.

主权项

1. An input/output receiver comprising:
a receiver portion to receive an analog differential serial input and sample the analog differential serial input to provide data and error signals; an equalization feedback loop responsive to the data and error signals to adjust the receiver portion; a phase estimator responsive to the data and error signals to estimate an unequalized phase error, wherein the phase estimator is not subjected to the equalization feedback loop; and a clock data recovery circuit coupled to the phase estimator to perform timing recovery for the receiver portion.