Data recovery apparatus and method for decreasing data recovery error in a high-speed serial link

A data recovery method for recovering effective data from serial data, the method being performed by an oversampling data recovery apparatus comprising:

• a clock signal generating circuit that generates at least two clock signal groups comprising first and second groups of sampling clock signals, wherein every sampling clock signal has a unique phase;
• and a data recovery circuit that recovers the effective data from the serial data by sampling the serial data by the sampling clock signals of a dynamically selected one of the at least two sampling clock signal groups, wherein the selection of the selected one of the at least two clock signal groups depends on the number of edges of the clock signals of the selected clock signal group being within an eye open region of the serial data.

A data recovery method for recovering effective data from an input stream of serial data having an eye open region and a plurality of zero-crossing transitions, the method comprising:

• oversampling each bit of the serial data at an oversampling rate of OSR, and latching OSR bits of sampling-data for each bit of serial data according to a selected one set of OSR sampling clock signals selected from among a first and second set of OSR sampling clock signals, wherein all the 2×OSR sampling clock signals have different phases;
• and wherein the selected set of OSR sampling clock signals has been dynamically selected so as to sample the serial data by a plurality of sampling clock signals having edges within the eye open region of the serial data.