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NAND read-reference voltage

A NAND read-reference voltage is a sensing voltage used to distinguish stored cell states during a read operation.

It is a decision boundary rather than the cell's threshold voltage. Error counts depend on how this boundary intersects state distributions [1]. Temperature compensation may adjust read references, while cell-dependent responses limit a single correction [2]; choosing a different boundary is not the same operation as rewriting data.

Relations

related

read-retry, data-retention, cross-temperature-effect, soft-decision-decoding

Limitations

• A lower raw error count after adjusting the reference is not evidence that stored charge was restored.

Citations

1. Chen, Chen, Lin, Kong, Liu, Zhan and Chen. Temperature Impacts on Endurance and Read Disturbs in Charge-Trap 3D NAND Flash Memories. Micromachines 12(10), 1152 (2021), sections 3-5. DOI: 10.3390/mi12101152. (accessed 2026-10-13)
2. An, Yoon, Go, Park, Kim, Kim and Lee. Effects of Poly-Si Grain Boundary on Retention Characteristics under Cross-Temperature Conditions in 3-D NAND Flash Memory. Micromachines 14(12), 2199 (2023), sections 2.1-2.2. DOI: 10.3390/mi14122199. (accessed 2026-10-13)
3. 3D NAND retention: layer count is not a reliability rating (accessed 2026-10-13)

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