SOFT INFORMATION MODULE

摘要

A soft information module is coupled between one or more flash memory devices and a decoder. The soft information module receives a putative value of one or more memory cells of the one or more flash memory devices based on a read of the one or more memory cells at an initial read level, and one or more respective indicators of whether the putative value was read at one or more respective different read levels offset from the initial read level, and receives a page indicator for the read. The soft information module determines a cell program region for the read based on the putative value, the one or more respective indicators, and the page indicator, identifies a predetermined confidence value for the region, and provides the confidence value to the decoder for association with the putative value, the confidence value being representative of a likelihood that the one or more memory cells was programmed to the putative value.

主权项

1. A method, comprising:
receiving a putative value of a memory cell based on a read of the memory cell at an initial read level, and one or more respective indicators of whether the putative value was read at one or more respective different read levels offset from the initial read level; receiving a page indicator for the read; determining a cell program region for the read based on the putative value, the one or more respective indicators, and the page indicator; identifying a predetermined confidence value for the region; and associating the confidence value with the putative value, the confidence value being representative of a likelihood that the memory cell was programmed to the putative value.