Clock data recovery apparatus and operation method thereof

An operation method for a clock data recovery apparatus, comprising:

• equalizing, by an equalizer, raw data to generate equalized data;
• generating, by a phase detector, a detection result according to the equalized data, wherein the phase detector performs pattern-filtering on the equalized data to filter out at least one pattern;
• generating, by a charge pump, a control signal according to the detection result;
• and
• generating, by an oscillation circuit, a clock signal according to the control signal,
• wherein the detection result comprises a first detection result Sup, and the operation method further comprises:
• calculating, by the phase detector, Sup=(d[n−5/2]{circumflex over ( )}d[n−3])*(tf[0]|(d[n−3]{circumflex over ( )}d[n−2]))*(tf[1]|(d[n−2]{circumflex over ( )}d[n−1]))*(tf[2]|(d[n−1]{circumflex over ( )}d[n])) to obtain the first detection result Sup,
• wherein {circumflex over ( )} is an XOR operand, * is an AND operand, | is an OR operand, d[n] indicates current data of the equalized data, d[n−1] indicates a previous first piece of data of the equalized data, d[n−2] indicates a previous second piece of data of the equalized data, d[n−3] indicates a previous third piece of data of the equalized data, d[n−5/2] indicates edge data of the equalized data between the previous second piece of data d[n−2] and the previous third piece of data d[n−3], and tf[0], tf[1] and tf[2] indicate different bits of a pattern selection signal.

A clock data recovery apparatus, comprising:

• an equalizer, configured to equalize raw data to generate equalized data, wherein the equalizer equalizes the raw data based on a loop-unrolling structure by using a first equilibrium coefficient, to generate current data of the equalized data;
• the equalizer equalizes the raw data based on the loop-unrolling structure by using a second equilibrium coefficient, to generate first edge data of the equalized data;
• the equalizer equalizes the raw data based on the loop-unrolling structure by using the first equilibrium coefficient, to generate error data of a difference between the equalized data and a reference signal;
• the equalizer updates the first equilibrium coefficient by using the current data and the error data;
• and the equalizer updates the second equilibrium coefficient by using the current data and the error data;
• a phase detector, coupled to the equalizer to receive the equalized data, and configured to generate a detection result according to the equalized data;
• a charge pump, coupled to the phase detector to receive the detection result, and configured to generate a control signal according to the detection result;
• and
• an oscillation circuit, coupled to the charge pump to receive the control signal, and configured to generate a clock signal according to the control signal.

An operation method for a clock data recovery apparatus, comprising:

• equalizing, by an equalizer, raw data based on a loop-unrolling structure by using a first equilibrium coefficient, to generate current data of equalized data;
• equalizing, by the equalizer, the raw data based on the loop-unrolling structure by using a second equilibrium coefficient, to generate first edge data of the equalized data;
• equalizing, by the equalizer, the raw data based on the loop-unrolling structure by using the first equilibrium coefficient, to generate error data of a difference between the equalized data and a reference signal;
• updating, by the equalizer, the first equilibrium coefficient by using the current data and the error data;
• updating, by the equalizer, the second equilibrium coefficient by using the current data and the error data;
• generating, by a phase detector, a detection result according to the equalized data;
• generating, by a charge pump, a control signal according to the detection result;
• and
• generating, by an oscillation circuit, a clock signal according to the control signal.