METHOD, ELECTRONIC DEVICE AND CONTROLLER FOR RECOVERING ARRAY OF MEMORY CELLS

摘要

A method, an electronic device and a controller for recovering an array of memory cells are provided. The method comprises the following steps. Whether a recovery control signal is received or not is determined. A retention checking procedure is executed for identifying whether a threshold voltage distribution of at least one bit of the memory cells in high threshold state is shifted or not, if the recovery control signal is received. A retention writing procedure is executed on the memory cells, if the memory cells in high threshold state do not pass the retention checking procedure.

主权项

1. A method for recovering a memory array including a plurality of memory cells, comprising:
executing a retention checking procedure for identifying whether a threshold voltage of one of the memory cells in a high threshold state is within a predetermined range; and executing a retention writing procedure on the one of the memory cells, when the threshold voltage of the one of the memory cells in the high threshold state is not within the predetermined range; wherein the predetermined range is between a minimum threshold voltage of a shifted threshold voltage distribution of at least one bit of the memory cells in the high threshold state and a minimum threshold voltage of the threshold voltage distribution of at least one bit of the memory cells in the high threshold state.