5 facts filed under Controller hardware: all 5 are reported by a second source. Each was checked against the source’s own words, so its figures appear there, and each names where it comes from. The idea is taught in Part 5, The Controller.
Secondary sources
Layer-to-layer variation aware reading (LaVAR) reduces the effect of layer-to-layer process variation in 3D NAND by tuning the read voltage for each layer.
Some dies adjust their own read levels from stored counts.
The survey describes disparity-based read reference voltage approximation, used by the SSD controller for each flash block to bring the initial voltage to a region where errors do not exceed the ECC correction capability.
The survey describes finding the optimal read reference voltage by adaptively learning and applying it for each flash block through sampling.
The survey discusses mechanisms that can discover and employ the optimal read reference and pass-through voltages.
Sources
Primary is the original paper, standard or datasheet. Secondary is a review, a vendor summary or a news report. Measured is my own test data.
Show all 3 sources
- SecondaryArchitectural Techniques for Improving NAND Flash Memory ReliabilityCarnegie Mellon University (PhD thesis), 2018
- SecondaryInside NAND Flash MemoriesSpringer, 2010
- SecondaryError Characterization, Mitigation, and Recovery in Flash-Memory-Based Solid-State Drives