Independent read threshold voltage tracking for multiple dependent read threshold voltages using syndrome weights
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United States of America Patent
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May 14, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jun 30, 2017
filing date -
Jul 8, 2016
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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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