Invention Grant
- Patent Title: Independent read threshold voltage tracking for multiple dependent read threshold voltages using syndrome weights
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Application No.: US15639052Application Date: 2017-06-30
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Publication No.: US10290358B2Publication Date: 2019-05-14
- Inventor: AbdelHakim S. Alhussien , Sundararajan Sankaranarayanan , Erich F. Haratsch
- Applicant: Seagate Technology LLC
- Applicant Address: US CA Cupertino
- Assignee: Seagate Technology LLC
- Current Assignee: Seagate Technology LLC
- Current Assignee Address: US CA Cupertino
- Agency: Ryan, Mason & Lewis, LLP
- Main IPC: G11C16/26
- IPC: G11C16/26 ; G11C29/52 ; G06F11/10 ; H03M13/11 ; G11C11/56 ; G11C16/28 ; H03M13/37 ; H03M13/00

Abstract:
Read threshold voltage tracking techniques are provided for multiple dependent read threshold voltages using syndrome weights. One method comprises reading codewords of multiple pages using different first read threshold voltages and a default second read threshold voltage; decoding read values for the multiple pages for the different first read threshold voltages and the default second read threshold voltage; aggregating a syndrome weight for each failed decoding attempt for the different first read threshold voltages; identifying a selected first read threshold voltage using a corresponding syndrome weight; reading codewords of the multiple pages using the selected first read threshold voltage and different second read threshold voltages; decoding read values for the selected first read threshold voltage and the different second read threshold voltages; aggregating the syndrome weight for the different second read threshold voltages; and identifying a selected second read threshold voltage using a corresponding syndrome weight.
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