Appratus and method for changing a read voltage applied for reading data from a non-volatile memory cell

Abstract

A read retry table (RRT) apparatus is coupled to a plurality of memory dies via a data path. The apparatus is configured to collect data from a plurality of memory cells coupled to a plurality of word lines in the plurality of memory dies via the data path; perform a first clustering on the plurality of word lines based on an error correction capability of error correction circuitry for collected data; perform a second clustering on an outlier of the first clustering; and generate or update an RRT based on values obtained from the first clustering and the second clustering.