Non-volatile semiconductor memory device and memory system in which write operation is resumed after being suspended for an interrupt operation
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 memory system comprising:
a controller chip; and
a memory chip configured to receive a plurality of commands from the controller chip; the memory chip 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 memory chip receives an instruction of executing a write operation,
suspend the write operation when the memory chip receives a suspend command, and
resume the write operation when; the memory chip receives a resume command after the control circuit suspends the write operation,
the memory chip being configured to output a first signal and a second signal to the controller chip when the memory chip receives a status command after the control circuit suspends the write operation and before the memory chip 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.
2. The memory system according to claim 1 , wherein the instruction includes an erase address input command, address data, and an erase command.
3. The memory system according to claim 1 , wherein the instruction includes a write address input command, address data, and a write command.
4. The memory system according to claim 1 , wherein the instruction includes address data.
5. The memory system according to claim 1 , wherein the memory chip is configured to perform an erase operation before the write operation.
6. The memory system according to claim 1 , wherein the memory chip is configured to perform a verify operation before the memory chip resumes the write operation.
7. The memory system according to claim 1 , wherein the control circuit is configured to resume the write operation when the resume command and address data are received from the controller chip.
8. The memory system according to claim 1 , wherein the write operation is resumed at the first memory cell when the write operation is resumed.
9. The memory system according to claim 1 , wherein the write operation is resumed at the second memory cell when the write operation is resumed.
10. The memory system according to claim 2 , wherein the memory chip further comprises a status register configured to hold information corresponding to the first signal.
11. The memory system according to claim 1 , wherein the memory chip further comprises a ready/busy pin, and
the memory chip is configured to output a third signal indicating a busy state via the ready/busy pin after the memory chip receives the instruction, output a fourth signal indicating a ready state via the ready/busy pin after the memory chip suspends the write operation, and output a fifth signal indicating the busy state via the ready/busy pin after the memory chip resumes the write operation.
12. A memory system comprising:
a controller chip; and
a memory chip configured to perform a write operation when the memory chip receives a write command, to suspend the write operation when the memory chip receives a suspend command, and then to resume the write operation when the memory chip receives a resume command, the memory chip including two pins,
the memory chip being configured to output a first signal via the two pins when the memory chip receives a status command after the memory chip suspends the write operation and before the memory chip resumes the write operation, the first signal indicating that the write operation is suspended.
13. The memory system according to claim 12 , wherein the memory chip configured to further output a second signal via the two pins when the memory chip receives a status command after the memory chip suspends the write operation and before the memory chip resumes the write operation, the second signal indicating whether the write operation is completed or not.
14. The memory system according to claim 12 , wherein the memory chip receives a write address input command and address data before the write command.
15. The memory system according to claim 12 , wherein the memory chip is configured to perform a verify operation before the memory chip resumes the write operation.
16. The memory system according to claim 12 , wherein the control circuit is configured to receive address data after the resume command.
17. The memory system according to claim 12 , wherein the memory chip further comprises a status register configured to hold information corresponding to the first signal.
18. The memory system according to claim 12 , wherein the memory chip further comprises a ready/busy pin, and
the memory chip is configured to output a third signal indicating a busy state via the ready/busy pin after the memory chip receives the write command, output a fourth signal indicating a ready state via the ready/busy pin after the memory chip suspends the write operation, and output a fifth signal indicating the busy state via the ready/busy pin after the memory chip resumes the write operation.
19. The memory system according to claim 12 , wherein the memory chip further comprises an input/output circuit configured to output the first signal and receive the plurality of commands.