- Patent Title: Error recovery of cross-die logical pages in a solid state device
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Application No.: US16138476Application Date: 2018-09-21
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Publication No.: US10732899B2Publication Date: 2020-08-04
- Inventor: Xiaoheng Chen
- 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: Loza & Loza, LLP
- Agent Gabriel Fitch
- Main IPC: G06F3/06
- IPC: G06F3/06 ; G11C16/26 ; G11C11/56 ; G11C16/04

Abstract:
Exemplary methods and apparatus are provided to reduce read retry latency within solid state devices (SSDs) with non-volatile memories (NVMs). The reduction in read retry latency may be accomplished in some examples by prioritizing read recovery of a regular codeword over an irregular codeword for a cross-die logical page, irrespective of the location in the page with read errors. In an illustrative example, a processor (a) performs a read retry for a second codeword by setting a read voltage level to a first level for a first die, then advancing through a read retry table for the second die until the second codeword is read successfully, and (b) then performs a read retry for the first codeword by setting a read voltage level for the second die to a second level, then advancing through a read retry table for the first die until the first codeword is successfully read.
Public/Granted literature
- US20190107973A1 ERROR RECOVERY OF CROSS-DIE LOGICAL PAGES IN A SOLID STATE DEVICE Public/Granted day:2019-04-11
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