Systems and methods for generating soft information in a flash device

摘要

Systems and methods are provided for generating a soft information metric corresponding to a bit stored in a memory. The systems and methods include comparing a symbol value associated with the stored bit to a plurality of decision thresholds to obtain a plurality of binary values. One of the plurality of binary values is selected to obtain a reference value. Further, a frequency metric is computed, which corresponds to the number of times each of the plurality of binary values equals a predefined value. The soft information metric is then determined based on the frequency metric and the reference value.

主权项

1. A method of generating a soft information metric corresponding to a bit stored in a memory, the method comprising:
comparing a symbol value associated with the stored bit to a plurality of decision thresholds to obtain a plurality of binary values; selecting, using control circuitry, one of the plurality of binary values to obtain a reference value; computing, using the control circuitry, a frequency metric corresponding to the number of times each of the plurality of binary values equals a predefined value; and determining the soft information metric based on the frequency metric and the reference value.