Patent ID: 11929130
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. A method for testing an auto refresh (AR) number, comprising:
executing a preset number of AR operations to obtain a corresponding data retention capacity, each of the AR operations comprising sending an AR command and waiting for a first preset time;
changing a preset refresh number to obtain the corresponding data retention capacity;
obtaining a change curve of a data retention capacity with respect to a corresponding preset refresh number; and
determining the AR number with the change curve;
wherein the obtaining the corresponding data retention capacity comprises:
executing a data reading step, the data reading step comprising waiting for a second preset time after executing the preset number of AR operations;
reading data after waiting for the second preset time;
when the data is successfully read, incrementing the second preset time, proceeding to the data reading step until the data is unable to be read, and determining a previous second preset time as the data retention capacity, wherein the previous second preset time is a previous longest second preset time in which the data may be read successfully; and
when the data is not successfully read, decrementing the second preset time, proceeding to the data reading step until the data is read, and determining a current second preset time as the data retention capacity.