Programming non-volatile electronic memory device with NAND architecture
View Patent ↗A non-volatile electronic memory device is integrated on a semiconductor and is of the Flash EEPROM type with a NAND architecture including at least one memory matrix divided into physical sectors, intended as smallest erasable units, and organized in rows or word lines and columns or bit lines of memory cells. At least one row or word line of a given physical sector is electrically connected to at least one row or word line of an adjacent physical sector to form a single logic sector being erasable, with the source terminals of the corresponding cells of the pair of connected rows referring to a same selection line of a source line.
1. A method of programming a non-volatile electronic memory device comprising a flash EEPROM memory matrix with a NAND architecture divided into physical sectors and organized into rows and columns of memory cells, at least one row of a given physical sector being coupled to at least one row of an adjacent physical sector to define a logic sector including a common source selection line coupled to the coupled rows, a common wordline coupled to wordlines of the coupled rows, and first and second drain selectors associated with each of the coupled rows, respectively, wherein each of the physical sectors is individually addressable based on a selection of the common source selection line, and a corresponding drain selector among the first and second drain selectors, the method comprising, for a given logic sector:
activating a drain selection line of a physical sector containing a memory cell to be programmed;
maintaining the common source selection line of the given logic sector as deselected; and
forcing, using the columns, a contextual pre-charging of the memory cells in the given logic sector.
2. The method of claim 1 , wherein forcing, using the columns, the contextual pre-charging of the memory cells of the given logic sector includes forcing a low potential on the columns containing the memory cell to be programmed.
3. The method of claim 2 , further comprising maintaining a pre-charge potential on the memory cells with content not to be modified.
4. The method of claim 1 , further comprising deselecting drain selection lines not associated with the physical sector containing the memory cell to be programmed.
5. The method of claim 1 , wherein maintaining the common source selection line of the given logic sector as deselected includes maintaining the common source selection line at a low potential.
6. The method of claim 5 , wherein the low potential is 0 volts.
7. The method of claim 1 , wherein the drain selection line of the physical sector containing the memory cell to be programmed is activated in a first programming step, and drain selection lines of physical sectors not containing the memory cell to be programmed are deselected in a second programming step.
8. The method of claim 1 , further comprising deselecting drain selection lines not associated with the programming.
9. The method of claim 1 , further comprising deselecting drain selection lines not associated with the logic sector,
wherein the logic sector is defined by the at least one row of the given physical sector being coupled to the at least one row of the adjacent physical sector.
10. The method of claim 1 , wherein the drain selection lines containing the row involved in the programming are associated with the logic sector defined by the at least one row of the given physical sector being coupled to the at least one row of the adjacent physical sector.
11. A method for programming a non-volatile electronic memory device comprising a flash EEPROM memory matrix with a NAND architecture divided into physical sectors and organized into rows and columns of memory cells, at least one row of a given physical sector being coupled to at least one row of an adjacent physical sector to define a logic sector including a common selection line coupled to the coupled rows, a common wordline coupled to wordlines of the coupled rows, and first and second drain selectors associated with each of the coupled rows, respectively, at least one column of the logic sector including a number of elemental structures equal to a number of coupled rows coupled to the common source selection line, each elemental structure having a dedicated drain selection line, the Flash EEPROM memory matrix being divided into at least a first memory portion and a second memory portion having different access speeds and sharing the elemental structures, only one of the first and second memory portions having coupled rows, the method comprising, for a given logic sector:
deselecting drain selection lines not associated with a physical sector of the given logic sector containing a memory cell to be programmed;
maintaining the common source selection lines of the given logic sector as deselected; and
configuring a pattern to be programmed by forcing a potential of 0 volts on a column containing the memory cell to be programmed and maintaining a pre-charge potential on the memory cells in the given logic sector with content not to be modified.
12. The method of claim 11 , further comprising providing an asynchronous reading access to at least one of the first and second memory portions.
13. The method of claim 11 , further comprising providing a synchronous reading access to at least one of the first and second memory portions.
14. The method of claim 11 , further comprising providing a reading access at a speed dependent on a region of the Flash EEPROM memory matrix containing data to be read.
15. The method of claim 11 , further comprising activating drain selection lines associated with the physical sector containing the memory cell to be programmed while maintaining the common source selection line of the given logic sector as deselected.
16. The method of claim 11 , wherein configuring the pattern to be programmed includes biasing adjacent columns of the memory cells at a supply voltage.
17. A method of programming a non-volatile electronic memory device comprising a flash EEPROM memory matrix with a NAND architecture divided into physical sectors and organized into rows and columns of memory cells, at least one row of a given physical sector being coupled to at least one row of an adjacent physical sector to define a logic sector including a common selection line coupled to the coupled rows, a common wordline coupled to wordlines of the coupled rows, and first and second drain selectors associated with each of the coupled rows, respectively, the method comprising:
deselecting the common source selection lines of the given logic sector;
activating a drain selection line of a physical sector containing a memory cell to be programmed; and
deselecting drain selection lines not associated with the physical sector containing the memory cell to be programmed.
18. The method of claim 17 , wherein activating the drain selection line of the physical sector containing the memory cell to be programmed is performed while deselecting the common source selection lines of the given logic sector.
19. The method of claim 17 , further comprising configuring a pattern to be programmed by providing a low potential on the columns of the memory cells to be programmed.
20. The method of claim 19 , wherein configuring the pattern to be programmed further includes maintaining a pre-charge potential on the memory cells with content not to be modified.