Invention Grant
- Patent Title: Pre-program read to counter wordline failures
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Application No.: US16133552Application Date: 2018-09-17
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Publication No.: US10679708B2Publication Date: 2020-06-09
- Inventor: Sahil Sharma , Nian Yang , Philip David Reusswig
- Applicant: Western Digital Technologies, Inc.
- Applicant Address: US CA San Jose
- Assignee: Western Digital Technologies, Inc.
- Current Assignee: Western Digital Technologies, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Morgan, Lewis & Bockius LLP
- Main IPC: G11C16/26
- IPC: G11C16/26 ; G11C16/04 ; G11C16/14 ; G11C16/10 ; G11C11/56 ; G11C16/34

Abstract:
Disclosed are systems and methods for providing pre-program read to counter wordline failures. A method includes performing a read operation on a first portion of a flash memory in response to an erase operation on a second portion of the flash memory, wherein the first portion comprises a plurality of logical wordlines corresponding to a plurality of physical wordlines of the second portion. The method also includes counting, for each of the plurality of logical wordlines, a number of memory cells exceeding a threshold error voltage and marking defective physical wordlines in a bitmap. The method also includes performing a write operation into a third portion of the flash memory that includes at least one physical wordline marked as defective in the error bitmap, wherein a predetermined data pattern is written to a lower page of the at least one physical wordline.
Public/Granted literature
- US20200090759A1 PRE-PROGRAM READ TO COUNTER WORDLINE FAILURES Public/Granted day:2020-03-19
Information query