Method for controlling gain of multi-stage equalizer of serial data receiver

A method for controlling a gain of a multi-stage equalizer of a serial data receiver, applied to the serial data receiver, the serial data receiver comprising the multi-stage equalizer, wherein the method comprises the steps of:

• Step S1, enabling the serial data receiver to receive a set of serial data;
• Step S2, selecting at least one continuous first data sequence from the set of serial data according to a preset first rule;
• Step S3, selecting at least one continuous second data sequence from the first data sequence according to a preset second rule;
• Step S4, extracting predetermined bits from the second data sequence;
• Step S5, calculating an equalization gain identifier of the second data sequence by using each of the predetermined bits;
• and
• Step S6, controlling the gain value of the multi-stage equalizer according to the equalization gain identifier;
• wherein the preset first rule in Step S2 comprises:
• Step A1, passing through a sliding window having a length of m+1, the sliding window sliding backward from a start bit of the set of serial data by a preset step, m is an integer and greater than zero;
• and
• Step A2, extracting the serial data corresponding to the sliding window to act as the first data sequence.