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Can someone explain about flash memory trim bits ?

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tsuresh

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Hi ,
We have few trimming inputs in flash memory.I want to know more about what is trimming and why and how it is used ?
Will it be used post silicon or during design stage ?
Trim info from spec says :
"The high voltage applied to the matrix cells is fine controlled by the 42bit trim input. Trimming allows a specific margin control to avoid unnecessary cell stress"

Thanks,
Suresh
 

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