Method for non-volatile memory with linear estimation of initial programming voltage
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United States of America Patent
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Nov 18, 2008
Grant Date -
Mar 13, 2008
app pub date -
Sep 12, 2006
filing date -
Sep 12, 2006
priority date (Note) -
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Abstract
In a non-volatile memory, a selected page on a word line is successively programmed by a series of voltage pulses of a staircase waveform with verifications in between the pulses until the page is verified to a designated pattern. The programming voltage at the time the page is programmed verified will be to estimate the initial value of a starting programming voltage for the page. The estimation is further refined by using the estimate from a first pass in a second pass. Also, when the test is over multiple blocks, sampling of word lines based on similar geometrical locations of the blocks can yield a starting programming voltage optimized for faster programming pages.
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