ADAPTIVE BLOCK PARAMETERS

摘要

Data programmed in a block using a first set of programming parameters is read and a number of memory cells having threshold voltages in an intermediate threshold voltage range that is between ranges assigned to logic states is determined. The number is compared to a threshold number and if the number exceeds the threshold number then subsequent programming uses a second set of programming parameters.

主权项

1. A method of operating a nonvolatile block-erasable memory comprising:
programming data in a plurality of memory cells in a block of the nonvolatile block-erasable memory using a first set of programming parameters; subsequently performing a read operation to determine a number of memory cells of the plurality of memory cells having threshold voltages in an intermediate threshold voltage range that is between a first range assigned to a first logic state and a second range assigned to a second logic state; subsequently, comparing the number to a threshold number; and if the number exceeds the threshold number then performing subsequent programming of the block using a second set of programming parameters.