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US 10,311,951 B2Granted
Refresh architecture and algorithm for non-volatile memories
AssigneeMicron Technology, Inc.
InventorsFerdinando Bedeschi, Roberto Gastaldi
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Abstract
Methods and systems to refresh a nonvolatile memory device, such as a phase change memory. In an embodiment, as a function of system state, a memory device performs either a first refresh of memory cells using a margined read reference level or a second refresh of error-corrected memory cells using a non-margined read reference level.
Claims20
A method of refreshing a memory array in a non-volatile memory device, the method comprising:
- entering a system-on state;
- entering an active state after entering the system-on state;
- entering a standby state after the entering the active state;
- entering a system-off state after entering the standby state;
- and
- performing a refresh operation in the non-volatile memory device after entering the system-off state, wherein the non-volatile memory device is powered by a same power unit before and after the refresh operation is performed.
3 more elements
A non-volatile memory device comprising:
- a memory array;
- and
- a refresh controller coupled to the memory array, the refresh controller configured to control a refresh operation performed on the memory array after a system-off state is entered, wherein the system-off occurs after the non-volatile memory device enters a system-on state, an active state after entering the system-on state, and a standby state after the entering the active state, wherein the non-volatile memory device is powered by a same power unit before and after the refresh operation is performed.
A system comprising:
- a power supply unit configured to couple to an automobile battery;
- a memory controller unit coupled to the power supply unit;
- and
- a non-volatile memory device coupled to the memory controller unit, the non-volatile memory device including a memory array, the non-volatile memory device configured to:
- enter a system-on state;
- enter an active state after entering the system-on state;
- enter standby state after the entering the active state;
- enter a system-off state after entering the standby state;
- and
- perform a refresh operation in the non-volatile memory device after entering the system-off state, wherein the non-volatile memory device is powered by a same power unit before and after the refresh operation is performed.
7 more elements
Dependencies are inferred from the claim text.