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US 2018/0005690 A1Published application
Oscillator controlled random sampling method and circuit
AssigneeMicron Technology, Inc.
InventorsDonald M. Morgan, John D. Porter
Life of this patent
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Abstract
Various embodiments comprise methods and apparatuses for selecting a randomly-chosen seed row from among a stream of available data in a memory system. A refresh operation is then performed on at least one selected row of memory in the memory system based on the randomly-chosen seed row. Additional apparatuses and methods are described.
Claims21
A method, comprising:
- selecting a randomly-chosen seed row from among a stream of available data in a memory system;
- performing a refresh operation to at least one selected row of memory in the memory system based on the randomly-chosen seed row;
- selecting an oscillator having no synchronous relationship to periodic access cycles within a memory system;
- and
- triggering an address sample after a row hammer repair (RHR) operation that is randomly-selected from activation row accesses within the memory system.
2 more elements
(canceled)
-21. (canceled)
A method of operating a memory device, the method comprising:
- obtaining an address of a random one of a plurality of rows in a memory device receiving an activation signal;
- determining at least one row selected from a row before the obtained address and a row after the obtained row address;
- sending a refresh signal to the at least one row;
- and
- discontinuing sampling of the plurality of rows in the memory device receiving an activation signal at a random time as determined by a cross of a preselected time interval and a random activate count latched when the sampling began.
2 more elements
-27. (canceled)
A method, comprising:
- selecting a randomly-chosen seed row among a stream of available data in a memory system;
- and
- performing a refresh operation to at least one selected row of memory in the memory system based on the randomly-chosen seed row, the refresh operation being performed without determining a number of times any of rows of memory are accessed.
A method, comprising:
- selecting a randomly-chosen seed row from among a stream of available data in a memory system;
- performing a refresh operation to at least one selected row of memory in the memory system based on the randomly-chosen seed row;
- and
- providing a seed address for a subsequent row hammer repair (RHR) operation.
1 more element
A method, comprising:
- selecting a randomly-chosen seed row from among a stream of available data in a memory system;
- performing a refresh operation to at least one selected row of memory in the memory system based on the randomly-chosen seed row;
- and
- increasing a likelihood of selecting the randomly-chosen seed row from a row activation address within the stream of available data within a predetermined time interval, thereby lowering the possibility of selecting a row activation address from other time intervals.
1 more element
Dependencies are inferred from the claim text.