Memory device and memory system performing request-based refresh, and operating method of the memory device
First Claim
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1. A memory system comprising:
- a memory controller configured to receive a request signal, and output a first refresh command in response to the request signal; and
a memory device comprising;
a weak row detector configured to count an activated number of a first row during a predefined time period, compare the activated number with a first threshold number, and determine at least one row adjacent to the first row as a disturbed row when the activated number is equal to or greater than the first threshold number;
a refresh timing determiner configured to determine a refresh state of the disturbed row;
a refresh signal generator configured to generate the request signal based on determining the refresh state of the disturbed row, and transmit the request signal to the memory controller; and
a refresh controller configured to perform a request-based refresh on the disturbed row in response to the first refresh command received from the memory controller.
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Abstract
Provided are a memory device and a memory system performing request-based refresh, and an operating method of the memory device. The operating method includes: determining a weak row by counting an activated number of at least one row; requesting for refresh on the weak row based on a result of the determining; and performing target refresh on the weak row upon receiving a refresh command according to the requesting.
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Citations
20 Claims
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1. A memory system comprising:
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a memory controller configured to receive a request signal, and output a first refresh command in response to the request signal; and a memory device comprising; a weak row detector configured to count an activated number of a first row during a predefined time period, compare the activated number with a first threshold number, and determine at least one row adjacent to the first row as a disturbed row when the activated number is equal to or greater than the first threshold number; a refresh timing determiner configured to determine a refresh state of the disturbed row; a refresh signal generator configured to generate the request signal based on determining the refresh state of the disturbed row, and transmit the request signal to the memory controller; and a refresh controller configured to perform a request-based refresh on the disturbed row in response to the first refresh command received from the memory controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A memory device including a plurality of memory cell rows, the memory device comprising:
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a weak row detector configured to count an activated number of a first row during a predefined time period, compare the activated number with a first threshold number, and determine at least one row adjacent to the first row as a disturbed row when the activated number is equal to or greater than the first threshold number; a refresh timing determiner configured to determine a refresh state of the disturbed row; a refresh signal generator configured to generate a request signal based on determining the refresh state of the disturbed row, and transmit the request signal to an external device; and a refresh controller configured to perform a request-based refresh on the disturbed row in response to a first refresh command received from the external device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification