Patent ID: 8958243
Filing Date: 2015-02-17
Classification: G11C

Abstract:
1. A group classification method for a solid state storage device, the solid state storage device comprising a central cell and plural neighboring cells around the central cell, each of the central cell and the plural neighboring cells being programmable into one of M storing states, N neighboring cells of the plural neighboring cells having a significant ICI effect, the group classification method comprising steps of: establishing a voltage shift parameter table, wherein the voltage shift parameter table comprises a first positional parameter table corresponding to a first neighboring cell, and the first neighboring cell is one of the N neighboring cells having the significant ICI effect; determining M if the central cell has a first storing state of the M storing states, determining M dividing the first storing state into plural sub-regions according to the M classifying the central cells corresponding to a first number of ICI patterns into a first group of the first storing state, wherein the central cell threshold voltage shifts corresponding to the first number of ICI patterns lie in a first sub-region of the first storing state.