Memory Pattern Management for Data Retention

The patent applies preliminary action by establishing a protective data pattern (Solid Level 2 state) on memory cells before they undergo high-temperature storage during production. This pre-established protective state prevents degradation that would otherwise occur during the production process, allowing high-temperature storage without compromising data retention. The protective pattern is set up in advance to counteract the harmful effects of subsequent thermal exposure.

The patent applies parameter changes by transitioning memory cells to a Solid Level 2 protective data pattern state, which fundamentally alters the electrical and physical parameters of the memory cells. This protective state modifies the threshold voltage distribution and read window characteristics, enabling the system to use more aggressive programming and erase times while maintaining an adequate read window budget. The parameter change creates a buffer that protects against the effects of faster, less precise operations.

The patent applies universality by designing a protective data pattern (Solid Level 2 state) that serves multiple functions simultaneously: it protects memory cells from thermal degradation, maintains read window budget, and can be restored after erasure operations. This single protective mechanism addresses multiple reliability concerns that would otherwise require separate protective measures, thereby limiting the increase in device complexity while achieving improved data retention.