Patent ID: 7436904

Claim:
A data recovery apparatus for recovering effective data from serial data, the data recovery apparatus comprising: a clock signal generating circuit that generates at least two groups of clock signals, comprising first and second groups of clock signals, first group of clock signals comprising N phase shifted clock signals of an oversampling rate of N, the second group of signals comprising N phase shifted clock signals of the same oversampling rate and being timewise interstitial to the first group of signals, wherein N is greater than 1; an oversampler to sample the serial data at the oversampling rate of N using a selected one of the clock signal groups to generate sampling data; and a data recovery circuit that recovers the effective data from the serial data by analyzing the sampling data to determine whether a transition has occurred in the sampling data during clock sections of the currently selected group of clock signals and selecting a different one of the groups of clock signals to be used by the oversampler based on how many of the clock sections the transition has occurred.