26.5.10.2 ECC Processing Upon Writes

For each 64-bit section of data written in the page buffer, 8 ECC bits are transparently computed and stored alongside the 64 bits section when the page buffer is written in the memory array (manually or automatically depending on CTRLB.MANW).

Then during the life of the product, due to hardware issues or cosmic rays (or on-purpose fault injection as described later), some stored data or ECC bits may be corrupted.