State look ahead quick pass write algorithm to tighten ongoing natural threshold voltage of upcoming states for program time reduction
US11972817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2022 |
| Grant date | Apr 30, 2024 |
| Priority date | — |
| Expiry date | Nov 11, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/32
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A memory apparatus and method of operation are provided. The apparatus includes memory cells connected to word lines. The memory cells are disposed in strings and are configured to retain a threshold voltage corresponding to data states. A control means is configured to apply verification pulses of program verify voltages each associated with one of the data states to selected ones of the word lines to determine whether the memory cells connected thereto have the threshold voltage above each of the program verify voltages associated with the data states targeted for each of the memory cells being programmed during verify loops of a program-verify operation. The control means slows the memory cells targeted for a selected one of the data states identified as being faster to program than other ones of the memory cells during one of verify loops associated with an earlier one of data states.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.