Flash memory array system including a top gate memory cell
View Patent ↗A memory system includes memory cells arranged in sectors. A decoder corresponding to a sector disables memory cells having a defective top gate. The decoder may include a low voltage or high voltage latch for the disabling. A top gate handling algorithm is included. The memory system may include dynamic top gate coupling. A programming algorithm and waveforms with top gate handling is included.
1. A method comprising:
determining whether a top gate of a selected memory cell in a memory array is defective;
verifying whether an output value of the selected memory cell is a value expected when the top gate is not defective; and
programming the selected memory cell in the event that the output value is not the expected value;
wherein the memory cells are source side injection memory cells; and
wherein the memory cells are tip erased memory cells.
2. The method of claim 1 wherein the verification step includes verifying whether an output including one or more of a data output, a voltage output, and/or a current output corresponds to one or more of a data input, a voltage input, and/or a current input, respectively.
3. The method of claim 1 wherein the programming includes one terminal of the memory cell or bias thereof is fixed or incremental.
4. The method of claim 3 wherein the programming includes other terminals of the memory cell or biases being fixed or incremental.
5. The method of claim 1 further comprising performing a programming operation that uses a threshold to verify whether the memory cell is acceptable for use.
6. The method of claim 5 wherein the programming operation includes cell parameters subject to an increment or count function to determine if the threshold is reached.
7. The method of claim 1 wherein the memory array includes top gate operation using capacitance loading.
8. The method of claim 1 wherein gate metal is arranged to minimize a coupling effect between top gate lines in the memory array.
9. The method of claim 1 wherein top gates in the memory array are coupled using dynamic coupling or pseudo-dynamic coupling.
10. The method of claim 1 wherein one or more top gates are provided to enable operation using capacitance loading.
11. The method of claim 1 wherein top gates are provided to enable coupling via dynamic coupling or pseudo-dynamic coupling.
12. A memory system comprising:
a memory array comprising memory cells, wherein the memory cells are source side injection, tip erased memory cells;
circuitry including a decoder and control logic having a top gate handling circuit, wherein the circuitry is configured to:
determine whether a top gate of a memory cell selected for testing in the memory array is defective;
verify whether an output value of the memory cell is a value expected when the top gate is not defective; and
program the memory cell in the event that the output value is not the expected value.
13. The system of claim 12 wherein the circuitry is further configured to verify whether an output including one or more of a data output, a voltage output, and/or a current output corresponds to one or more of a data input, a voltage input, and/or a current input, respectively.
14. The memory system of claim 13 wherein the system is configured, in connection with program of the memory cell, such that one terminal of the memory cell or bias thereof is fixed or incremental.
15. The memory system of claim 13 the circuitry is further configured to perform a program operation that uses a threshold to verify whether the memory cell is acceptable for use.
16. The memory system of claim 15 wherein the circuitry is further configured such that the program operation includes cell parameters subject to an increment or count function to determine if the threshold is reached.
17. The memory system of claim 13 wherein the memory array is configured for top gate operation using capacitance loading.
18. The memory system of claim 13 wherein gate metal in the memory array is arranged to minimize a coupling effect between top gate lines.
19. The memory system of claim 13 wherein one or more top gates of the memory array are configured to enable operation using capacitance loading.
20. The system of claim 12 wherein the system is configured, in connection with program of the memory cell, such that one terminal of the memory cell or bias thereof is fixed or incremental.
21. The memory system of claim 12 the circuitry is further configured to perform a program operation that uses a threshold to verify whether the memory cell is acceptable for use.
22. The memory system of claim 12 wherein the circuitry is further configured such that the program operation includes cell parameters subject to an increment or count function to determine if the threshold is reached.
23. The memory system of claim 22 wherein the memory array is configured for top gate operation using capacitance loading.
24. The memory system of claim 22 wherein gate metal in the memory array is arranged to minimize a coupling effect between top gate lines.
25. The memory system of claim 22 wherein one or more top gates of the memory array are configured to enable operation using capacitance loading.
26. The memory system of claim 21 wherein the memory array is configured for top gate operation using capacitance loading.
27. The memory system of claim 21 wherein gate metal in the memory array is arranged to minimize a coupling effect between top gate lines.
28. The memory system of claim 21 wherein one or more top gates of the memory array are configured to enable operation using capacitance loading.
29. The memory system of claim 12 wherein the memory array is configured for top gate operation using capacitance loading.
30. The memory system of claim 29 wherein gate metal in the memory array is arranged to minimize a coupling effect between top gate lines.
31. The memory system of claim 29 wherein one or more top gates of the memory array are configured to enable operation using capacitance loading.
32. The memory system of claim 12 wherein gate metal in the memory array is arranged to minimize a coupling effect between top gate lines.
33. The memory system of claim 32 wherein one or more top gates of the memory array are configured to enable operation using capacitance loading.
34. The memory system of claim 12 wherein top gates in the memory array are configured to enable coupling via dynamic coupling or pseudo-dynamic coupling.
35. The memory system of claim 12 wherein one or more top gates of the memory array are configured to enable operation using capacitance loading.