Methods and apparatus for soft data generation for memory devices based on performance factor adjustment

摘要

Methods and apparatus are provided for soft data generation for memory devices based on a performance factor adjustment. At least one soft data value is generated for a memory device, such as a flash memory device, by obtaining at least one read value; and generating the soft data value based on the obtained at least one read value and an adjustment based on one or more performance factors of the memory device. The read values may be soft data or hard data. Possible performance factors include endurance, number of read cycles, retention time, temperature, process corner, inter-cell interference impact, location and a pattern of aggressor cells. One or more pattern-dependent and/or location-specific performance factors may also be considered. The generated soft data value may be a soft read value used to generate one or more log likelihood ratios or may be the log likelihood ratios themselves.

主权项

1. A method for generating at least one soft data value for a memory device, comprising the steps of:
obtaining at least one read value from said memory device; obtaining at least one nominal value based on said at least one read value obtained from said memory device, wherein said at least one nominal value indicates a reliability of at least one bit of said at least one read value; obtaining at least one offset value based on one or more performance factors of said memory device; and generating said at least one soft data value by applying said at least one offset value to said at least one nominal value.