Patent ID: 7760555
Filing Date: 2010-07-20
Classification: G11C

Abstract:
1. A method for operating a memory system, comprising: programming a first set of storage elements in a portion of the memory system to physical states according to first logical state-to-physical state assignments; and programming a second set of storage elements, different than the first set of storage elements, in the portion of the memory system, to physical states which identify the first logical state-to-physical state assignments, threshold voltages of the physical states to which the second set of storage elements is programmed are further apart than threshold voltages of the physical states to which the first set of storage elements is programmed; the threshold voltages of the physical states to which the second set of storage elements is programmed are spaced apart, at a minimum, at least by a voltage corresponding to a spacing between two non-adjacent physical states of the physical states to which the first set of storage elements is programmed.