Method and Apparatus for Refreshing and Data Scrubbing Memory Device

摘要

At least one refresh without scrubbing is performed on a corresponding portion of the memory device with a first frequency. In addition, at least one refresh with scrubbing is performed on a corresponding portion of the memory device with a second frequency less than the first frequency. Accordingly, refresh operations with data scrubbing are performed to prevent data error accumulation. Furthermore, refresh operations without data scrubbing are also performed to reduce undue power consumption from the data scrubbing.

主权项

1. A method of operating a semiconductor memory device that communicates with an external controller, the method comprising:
receiving a first command from the external controller; activating a page of a memory array in response to the first command; selecting at least one sub page from a plurality of sub pages of the activated page; performing error detection on data read from the selected sub page; and writing error-corrected data back to the sub page.