Data Randomization in 3-D Memory

摘要

In a nonvolatile memory array, such as a three-dimensional array of charge-storage memory cells, data is randomized so that data of different strings along the same bit line are randomized using different keys and portions of data along neighboring word lines are randomized using different keys. Keys may be rotated so that data of a particular word line is randomized according to different keys in different strings.

主权项

1. A method of operating a three-dimensional charge-storage memory that stores data in memory cells formed in multiple physical levels disposed above a substrate, comprising:
receiving a plurality of portions of data to be stored in the three-dimensional charge-storage memory; determining physical locations in the three-dimensional charge-storage memory array for storing the plurality of portions of data; and randomizing the plurality of portions of data according to their respective physical locations using a plurality of randomization keys such that portions of data that are to be stored at locations immediately adjacent to each other in the vertical direction are randomized using different randomization keys and portions of data that are to be stored at locations immediately adjacent to each other in the horizontal direction are randomized using different randomization keys.