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US 2019/0096492 A1Published application
Hybrid read disturb count management
AssigneeSK hynix Inc.
InventorsYu Cai, Fan Zhang, June Lee
Life of this patent
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Abstract
Memory systems may include a memory including a plurality of blocks, and a controller suitable for counting, with a counter, a number of reads to a block of the plurality of blocks, updating wordline information of a plurality of wordlines in the counted block when the number of reads exceeds a block read count threshold, selecting a wordline from the plurality of wordlines, determining an error rate of a neighbor wordline to the selected wordline, and reclaiming data in the block when the error rate exceeds an error threshold.
Claims21
-17. (canceled)
A device comprising:
- a semiconductor memory having memory blocks;
- and
- a memory controller programmed to:
- count a number of reads to each of the memory blocks;
- allocate storage for storing read information associated with a subset of the memory blocks, each memory block in the subset of the memory blocks satisfying a read disturb check criteria;
- select a wordline of a memory block in the subset of the memory blocks;
- determine that an error rate for memory cells connected to a neighbor wordline of the selected wordline exceeds an error threshold;
- and
- reclaim data in the memory block containing the selected wordline in response to determining that the error rate exceeds the error threshold.
6 more elements
A method comprising:
- counting a number of reads to a memory block of a semiconductor memory;
- allocating storage for storing read information associated with the memory block;
- determining that the memory block is subject to a data reclaim process based on a random number generated by firmware;
- selecting a wordline of the memory block;
- determining whether an error rate for memory cells connected to a neighbor wordline of the selected wordline exceeds an error threshold;
- and
- reclaiming data in the memory block in response to determining that the error rate exceeds the error threshold.
4 more elements
A device comprising:
- a semiconductor memory;
- and
- a controller programmed to:
- count a number of reads to a memory block of the semiconductor memory;
- determine that the memory block is subject to a data reclaim process based on a random number generated by firmware;
- determine whether a read disturb level of memory cells connected to a wordline of the memory block exceeds a threshold;
- and
- reclaim data in the memory block in response to determining that the read disturb level exceeds the threshold.
5 more elements
Dependencies are inferred from the claim text.