Data equalizing circuit and data equalizing method

A data equalizing circuit comprising:

• an equalizer configured to control a gain of data according to a value of a control code;
• a multi-phase locked loop configured to receive a reference clock and output N number of clocks having a frequency corresponding to 1/N times a frequency of the data with a phase difference of n/N;
• a data latching section configured to store the data as N number of latched data in synchronization with the N number of clocks, respectively;
• a data transition counting section configured to compare adjacent values of the N number of latched data and count data transition frequencies for n/N periods;
• a counting completion signal generating section configured to generate a counting completion signal when counting of the data transition frequencies for the n/N periods is completed;
• and
• a controller configured to calculate and store dispersion values of data transition frequencies for 1/N periods from the data transition frequencies for the n/N periods in response to the counting completion signal while changing the value of the control code, and output the value of the control code corresponding to a largest dispersion value, wherein n is equal to or greater than 2 and is set such that boundaries of respective n/N periods of the data have different positions in the 1_UI (unit interval) data

A data equalizing method for controlling a correction degree of a data eye in response to a value of a control code including a plurality of bits, comprising:

• dividing n cycles of the data into N number of periods, and counting data transition frequencies for n/N periods while changing the value of the control code sequentially from a minimum value;
• calculating dispersion values of data transition frequencies for 1/N periods of the data of 1 UI (unit interval) from the data transition frequencies for the n/N periods according to respective values of the control code:
• and
• outputting the value of the control code when a dispersion value is largest among the dispersion values of the data transition frequencies for the 1/N periods, as a final control code,
• wherein n is equal to or greater than 2 and is set such that boundaries of the respective n/N periods of the data have different positions in the 1_UI data.