Apparatuses and methods for distributed targeted refresh operations
View Patent ↗Embodiments of the disclosure are drawn to apparatuses and methods for distributed timing of targeted refresh operations. Information stored in volatile memory cells may decay unless refresh operations are performed. A memory device may perform auto-refresh operations, as well as one or more types of targeted refresh operations, where particular rows are targeted for a refresh. Targeted refresh operations may draw less power than an auto-refresh operation. It may be desirable to distribute targeted refresh operations throughout a sequence of refresh operations, to average out a power draw in the memory device. Responsive to an activation of a refresh signal, the memory device may perform a group of refresh operations. At least one refresh operation in each group may be a targeted refresh operation.
1. An apparatus comprising:
a refresh control circuit configured to perform a plurality of refresh operations responsive to each activation of a refresh signal, wherein each of the plurality of refresh operations is either a first type of refresh operation or a second type of refresh operation, and wherein each time the refresh signal is provided, at least one of the plurality of refresh operations is the first type of refresh operation, and
wherein the refresh control circuit is configured to provide a plurality of activations of a refresh pump signal responsive to each activation of the refresh signal, wherein each of the plurality of refresh operations is associated with one of the plurality of activations of the refresh pump signal.
2. The apparatus of claim 1 , wherein the first type of refresh operations are associated with different activations of the refresh pump signal provided to different activations of the refresh signal.
3. The apparatus of claim 1 , wherein the first type of refresh operation is a targeted refresh operation, and the second type of refresh operation is an auto-refresh operation.
4. The apparatus of claim 1 , wherein the first type of refresh operation comprises refreshing a first number of rows of a memory, and wherein the second type of refresh operation comprises refreshing a second number of rows of the memory which is greater than the first number of rows.
5. The apparatus of claim 1 , further comprising an interface configured to provide the activations of the refresh signal, and wherein the refresh control circuit is configured to provide a command signal based on a count of the activations of the refresh signal.
6. The apparatus of claim 5 , wherein when the command signal is active, the refresh control circuit is configured to perform a third type of refresh operation instead of the first type of refresh operation.
7. The apparatus of claim 5 , wherein when the command signal is active, the refresh control circuit is configured to perform at least one of the first type of refresh operation, the second type of refresh operation, and a third type of refresh operation as the plurality of refresh operations each time the refresh signal is activated.
8. A method comprising:
receiving an activation of a refresh signal at a refresh control circuit;
performing a plurality of refresh operations with the refresh control circuit responsive to the activation of the refresh signal, wherein each of the plurality of refresh operations is a first type of refresh operation or a second type of refresh operation, and wherein the plurality of refresh operations includes performing at least one of the first type of refresh operation;
generating a plurality of activations of a refresh pump signal responsive to each activation of the refresh signal; and
performing one of the plurality of refresh operations associated with each activation of the refresh pump signal.
9. The method of claim 8 , further comprising:
refreshing a first number of word lines as part of the first type of refresh operation; and
refreshing a second number of word lines as part of the second type of refresh operation, wherein the second number is greater than the first number.
10. A method comprising:
receiving an activation of a refresh signal at a refresh control circuit;
performing a plurality of refresh operations with the refresh control circuit responsive to the activation of the refresh signal, wherein each of the plurality of refresh operations is a first type of refresh operation or a second type of refresh operation, and wherein the plurality of refresh operations includes performing at least one of the first type of refresh operation; and
receiving a second activation of the refresh signal at the refresh control circuit;
performing a second plurality of refresh operations responsive to the second activation of the refresh signal, wherein the second plurality of refresh operations includes different number of the first type of refresh operation than the plurality of refresh operations.
11. The method of claim 8 , further comprising identifying an aggressor address, wherein the first type of refresh operation is a targeted refresh operation associated with the aggressor address and the second type of refresh operation is an auto-refresh operation.
12. A method comprising:
receiving an activation of a refresh signal at a refresh control circuit;
performing a plurality of refresh operations with the refresh control circuit responsive to the activation of the refresh signal, wherein each of the plurality of refresh operations is a first type of refresh operation or a second type of refresh operation, and wherein the plurality of refresh operations includes performing at least one of the first type of refresh operation;
identifying an aggressor address, wherein the first type of refresh operation is a targeted refresh operation associated with the aggressor address and the second type of refresh operation is an auto-refresh operation;
performing a first refresh which is the first type of refresh operation as part of the plurality of refresh operations, wherein the first refresh is associated with a first aggressor address; and
performing a second refresh which is the first type of refresh operation as part of the plurality of refresh operations, wherein the second refresh is associated with a second aggressor address.