Non-volatile semiconductor memory device and memory system
View Patent ↗A non-volatile semiconductor memory device includes a memory cell array and a control circuit. A control circuit performs an erase operation providing a memory cell with a first threshold voltage level for erasing data of a memory cell, and then perform a plurality of first write operations providing a memory cell with a second threshold voltage level, the second threshold voltage level being higher than the first threshold voltage level and being positive level. When the control circuit receives a first execution instruction from outside during the first write operations, the first execution instruction being for performing first function operation except for the erase operation and the first write operations, the circuit performs the first function operation during the first write operations.
1. A non-volatile semiconductor memory device comprising
a memory cell array including a plurality of memory cells, the plurality of memory cells including a first memory cell and a second memory cell;
a plurality of word-lines including a first word-line; and
a control circuit,
the memory cell array comprising,
a semiconductor substrate,
a first semiconductor layer extending in a direction perpendicular to the semiconductor substrate, and functioning as a body of the first memory cell,
a charge accumulation layer, and
a first conductive layer provided to sandwich the charge accumulation layer with the first semiconductor layer, and functioning as a gate of the first memory cell and a first word-line;
the control circuit being configured to
perform a write operation when the non-volatile semiconductor memory device receives a first instruction for executing the write operation,
suspend the write operation when the non-volatile semiconductor memory device receives a suspend command during the write operation,
resume the write operation when the non-volatile semiconductor memory device receives a resume command after the non-volatile semiconductor memory device suspends, and
output a first signal and a second signal to a controller when the non-volatile semiconductor memory device receives a status command after the non-volatile semiconductor memory device suspends and before the non-volatile semiconductor memory device resumes, the first signal and the second signal indicating whether the write operation is completed or not and that the write operation is suspended.
2. The non-volatile semiconductor memory device according to claim 1 , wherein
the control circuit is configured to perform the write operation for the first memory cell and resume the write operation for the first memory cell.
3. The non-volatile semiconductor memory device according to claim 1 , further comprising:
a ready/busy terminal,
wherein the control circuit is configured to output a third signal indicating a busy state to the ready/busy terminal after the non-volatile semiconductor memory device receives the first instruction, output a fourth signal indicating a ready state to the ready/busy terminal after the non-volatile semiconductor memory device suspends the write operation, and output a fifth signal indicating the busy state to the ready/busy terminal after the non-volatile semiconductor memory device resumes the write operation.
4. The non-volatile semiconductor memory device according to claim 3 , further comprising:
an input/output circuit,
wherein the control circuit is configured to output the first signal and the second signal to the input/output circuit.
5. The non-volatile semiconductor memory device according to claim 1 , wherein
the control circuit is configured to resume the write operation based on whether the write operation is completed or not.
6. The non-volatile semiconductor memory device according to claim 1 , further comprising:
a status register
configured hold information corresponding to the first signal.
7. The non-volatile semiconductor memory device according to claim 1 , further comprising:
a second conductive layer functioning as a gate of the second memory cell and a second word-line, wherein
the control circuit is configured to perform the write operation for the first memory cell and resume the write operation for the second memory cell.
8. The non-volatile semiconductor memory device according to claim 2 , wherein
the control circuit is configured to perform a verify operation before the non-volatile semiconductor memory device resumes the write operation.
9. The non-volatile semiconductor memory device according to claim 1 , wherein the first instruction includes an erase address input command, address data, and an erase command.
10. The non-volatile semiconductor memory device according to claim 1 , wherein the first instruction includes a write address input command, address data, and a write command.
11. The non-volatile semiconductor memory device according to claim 1 , wherein
the control circuit is configured to perform an erase operation before the write operation.
12. The non-volatile semiconductor memory device according to claim 11 , wherein
at least one of the memory cells has a negative threshold voltage after erase operation before the write operation, and the one of the memory cells has a positive threshold voltage after the write operation.
13. The memory system according to claim 11 , wherein
the write operation is performed plural times,
the write operation is performed at least for one of the memory cells, the one of the memory cells having a negative threshold voltage, and
after the plural times of write operations, the one of the memory cells has a positive threshold voltage.
14. A non-volatile semiconductor memory device comprising
a first memory cell;
a second memory cell; and
a control circuit configured to
apply a write voltage to a gate of the first memory cell when the non-volatile semiconductor memory device receives an instruction of executing a write operation,
suspend the write operation when the non-volatile semiconductor memory device receives a suspend command, and
resume the write operation when the non-volatile semiconductor memory device receives a resume command after the control circuit suspends the write operation; and
the non-volatile semiconductor memory device is configured to output a first signal and a second signal when the non-volatile semiconductor memory device receives a status command after the control circuit suspends the write operation and before the non-volatile semiconductor memory device resumes the write operation, the first signal and the second signal indicating whether the write operation is completed or not and that the write operation is suspended.
15. The non-volatile semiconductor memory device according to claim 14 , further comprising:
a ready/busy terminal,
wherein the non-volatile semiconductor memory device is configured to output a third signal indicating a busy state to the ready/busy terminal after the non-volatile semiconductor memory device receives the instruction, output a fourth signal indicating a ready state to the ready/busy terminal after the non-volatile semiconductor memory device suspends, and output a fifth signal indicating the busy state to the ready/busy terminal after the non-volatile semiconductor memory device resumes the write operation.
16. The non-volatile semiconductor memory device according to claim 15 , further comprising:
a status register
configured to hold information corresponding to the first signal.
17. The non-volatile semiconductor memory device according to claim 14 , wherein
the control circuit is configured to perform a verify operation before the non-volatile semiconductor memory device resumes the write operation.
18. The non-volatile semiconductor memory device according to claim 14 , wherein the instruction includes an erase address input command, address data, and an erase command.
19. The non-volatile semiconductor memory device according to claim 14 , wherein the instruction includes an write address input command, address data, and a write command.
20. The non-volatile semiconductor memory device according to claim 14 , wherein the control circuit is configured to perform an erase operation before the write operation.
21. The non-volatile semiconductor memory device according to claim 20 , wherein
the first memory cell has a negative threshold voltage before the write operation, and the first memory cell has a positive threshold voltage after the write operation.
22. The non-volatile semiconductor memory device according to claim 14 , wherein
the instruction includes address data.
23. The non-volatile semiconductor memory device according to claim 14 , wherein
the control circuit is configured to resume when the resume command and address data are received from the controller.
24. The non-volatile semiconductor memory device according to claim 14 , wherein
the write operation is resumed at the first memory cell when the write operation is resumed.
25. The non-volatile semiconductor memory device according to claim 14 , wherein
the write operation is resumed at the second memory cell when the write operation is resumed.
26. A method of controlling non-volatile semiconductor memory device,
the non-volatile semiconductor memory device comprising a first memory cell and a second memory cell,
the method comprising:
applying a write voltage to a gate of the first memory cell when the non-volatile semiconductor memory device receives an instruction of executing a write operation
suspending the write operation when the non-volatile semiconductor memory device receives a suspend command; and
resuming the write operation when the non-volatile semiconductor memory device receives a resume command after the non-volatile semiconductor memory device suspends the write operation; and
transmitting a first signal and a second signal to the controller via an input/output circuit, when the non-volatile semiconductor memory device receives a status command after the non-volatile semiconductor memory device suspends the write operation, the first signal and the second signal indicating whether the write operation is completed or not and that the write operation is suspended.
27. The method according to claim 26 , further comprising:
outputting a third signal indicating a busy state to a ready/busy terminal after the non-volatile semiconductor memory device receives the first instruction, outputting a fourth signal indicating a ready state to the ready/busy terminal after the non-volatile semicondutor memory device suspends, and outputting a fifth signal indicating the busy state to the ready/busy terminal after the resuming.
28. The method according to claim 27 , wherein the non-volatile semiconductor memory device, further includes a status register, further comprising:
holding information corresponding to the first signal in the status register.
29. The method according to claim 26 , further comprising
performing a verify operation before the non-volatile semiconductor memory device resumes the write operation.
30. The method according to claim 26 , wherein
the instruction includes an erase address input command, address data, and an erase command.
31. The method according to claim 26 , wherein
the instruction includes an write address input command, address data, and a write command.
32. The method according to claim 26 , further comprising
performing an erase operation before the write operation.
33. The method according to claim 32 , wherein
the first memory cell has a negative threshold voltage before the write operation, and the the first memory cell has a positive threshold voltage after the write operation.