Memory system and operating method thereof with tracking array to adjust sensing time for accuracy

An operating method of a memory system, comprising:

• inputting tracking data into a tracking array;
• generating a plurality of tracking logic values by a plurality of tracking cell columns in the tracking array according to the tracking data;
• counting the plurality of tracking logic values to generate a summation value;
• adjusting a sensing time of a sensing device according to the summation value;
• performing a computing operation by a computing array to generate a plurality of computing signals;
• sensing the plurality of computing signals by the sensing device according to the adjusted sensing time and a clock signal;
• when the summation value is different from a preset value, adjusting a period of the clock signal;
• setting the sensing time as a first sensing time;
• generating a plurality of tracking signals according to the tracking data by the plurality of tracking cell columns;
• sensing the plurality of tracking signals according to the first sensing time to generate a plurality of first tracking logic values;
• counting the plurality of first tracking logic values to generate a first summation value;
• when the first summation value is equal to a quantity of the plurality of tracking cell columns, setting the sensing time as a second sensing time,
• wherein the second sensing time is smaller than the first sensing time;
• sensing the plurality of tracking signals according to the second sensing time to generate a plurality of second tracking logic values;
• counting the plurality of second tracking logic values to generate a second summation value;
• when the second summation value is different from the quantity of the plurality of tracking cell columns, setting the sensing time as the first sensing time;
• sensing the plurality of computing signals according to the first sensing time by the sensing device;
• before setting the sensing time as the first sensing time, setting the sensing time as an initial sensing time;
• sensing the plurality of tracking signals according to the initial sensing time to generate a plurality of initial tracking logic values;
• counting the plurality of initial tracking logic values to generate an initial summation value;
• and
• when the initial summation value is equal to the quantity of the plurality of tracking cell columns, setting the sensing time as a third sensing time,
• wherein the third sensing time is smaller than the initial sensing time, and
• a difference between the third sensing time and the initial sensing time is equal to a difference between the first sensing time and the second sensing time.