Semiconductor memory device storing refresh period information and operating method thereof
First Claim
1. A semiconductor memory device comprising:
- a cell array comprising one or more cell regions each having a plurality of memory cells; and
a refresh information storing unit configured to store first information including a first refresh period, and second information including a second refresh period in correspondence to each of the cell regions,wherein memory cells included in each of the cell regions are refreshed at the first refresh period according to the first information in a first refresh time band and are refreshed at the second refresh period according to the second information in a second refresh time band.
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Abstract
A semiconductor memory device which stores refresh period information thereby adjusting a refresh period and a method of operating the same. The semiconductor memory device includes a cell array and a refresh information storing unit. The cell array includes one or more cell regions each having a plurality of memory cells. The refresh information storing unit is configured to store first information including a first refresh period and second information including a second refresh period in correspondence to each of the cell regions. Memory cells included in each of the cell regions are refreshed at the first refresh period according to the first information in a first refresh time band and are refreshed at the second refresh period according to the second information in a second refresh time band.
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Citations
20 Claims
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1. A semiconductor memory device comprising:
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a cell array comprising one or more cell regions each having a plurality of memory cells; and a refresh information storing unit configured to store first information including a first refresh period, and second information including a second refresh period in correspondence to each of the cell regions, wherein memory cells included in each of the cell regions are refreshed at the first refresh period according to the first information in a first refresh time band and are refreshed at the second refresh period according to the second information in a second refresh time band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A semiconductor memory device comprising:
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a cell array comprising one or more cell regions each having a plurality of memory cells; a refresh information storing unit configured to store information regarding refresh periods corresponding to the respective cell regions; a refresh counter configured to output a first address for refreshing a first memory cell included in a first cell region of the cell array when the semiconductor memory device receives a first command; and an address selecting unit configured to select a second address received from outside the semiconductor memory device and to refresh a second memory cell included in a second cell region of the cell array when the semiconductor memory device receives a second command. - View Dependent Claims (12, 13, 14, 15)
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16. A semiconductor memory device comprising:
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a cell array comprising a plurality of cell regions each having a plurality of memory cells; and a refresh information storing unit configured to store refresh information including a plurality of retention characteristic values, each retention characteristic value indicating one or more bits, wherein memory cells included in a first cell region of the cell regions are refreshed at the first refresh period and memory cells included in a second cell region of the cell regions are refreshed at the second refresh period greater than the first refresh period. - View Dependent Claims (17, 18, 19, 20)
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Specification