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As a result, it is sufficient for ECC to provide gradually stronger error correction capability throughout the entire NAND flash memory lifetime.
This observation directly motivates us to adaptively change the LDPC code parity check matrix column weight throughout the entire NAND flash memory lifetime.
To meet a specified P/E cycling endurance limit, the LDPC code decoding with the maximum allowable soft-decision memory sensing precision should be able to tolerate the worst-case raw storage reliability at the end of memory lifetime.
Experimental results carried out on a quad core CMP system show that the proposed technique prolongs PCM main memory lifetime by 48% which is achieved at the price of 1% and 2% overhead in read and write latencies respectively.
Compared with using a single fixed low-weight LDPC code throughout the entire lifetime of NAND flash memory, this proposed adaptive design method can achieve better hard-decision decoding performance (hence lower hard-decision decoding failure rate) throughout the entire NAND flash memory lifetime.
To address this design dilemma, instead of using the same LDPC code throughout the entire NAND flash memory lifetime, we propose to adaptively adjust the LDPC code parity check matrix column weight based upon the wear-out progress of the NAND flash memory.
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In memories, a lifetime.
A former resident of NYC and Cove Neck, L.I., he leaves us with enduring memories of lifetime accomplishments.
The guy sweeping and the muttering man and the woman with the clipboard and the reporter taking notes existed in a strange, half-unreal state of being part of someone else's deepest memories a lifetime from now.
The same was true for memories of lifetime periods (weak mean = 0.4; strong mean = 0.31; t(9) = −1.122, P < 0.29).
In summer, you can get these jewels of memories to put on your lifetime memory belt".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com