METHOD OF REFRESHING DYNAMIC RANDOM ACCESS MEMORY, IN PARTICULAR IN STANDBY MODE AND IN ACTIVE OPERATING MODE, AND CORRESPONDING DYNAMIC RANDOM ACCESS MEMORY DEVICE, FOR EXAMPLE INCORPORATED INTO A CELLULAR MOBILE TELEPHONE
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Abstract
A dynamic random access memory may include at least one group of memory cells, and a respective auxiliary memory for each group of memory cells. The respective auxiliary memory is for storing refresh information specific to each respective group of memory cells. The refresh information may include a current refresh period and a time remaining before refresh.
24 Citations
28 Claims
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1-9. -9. (canceled)
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10. A dynamic random access memory comprising:
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a plurality of groups of memory cells; and a respective auxiliary memory for each group of memory cells for storing refresh information specific thereto. - View Dependent Claims (11, 12, 13)
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14. A electronic device comprising:
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a plurality of groups of dynamic random access memory cells; an respective auxiliary memory for each groups of dynamic random access memory cells for storing refresh information specific thereto; and a logic circuit for updating the refresh information depending on whether said respective groups of dynamic random access memory cells has been read accessed or write accessed during a current refresh period. - View Dependent Claims (15, 16, 17, 18)
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19. A method of refreshing a dynamic random access memory comprising a plurality of groups of memory cells, a respective auxiliary memory for each group of memory cells for storing refresh information specific to the respective group of memory cells, and a logic circuit for updating, the refresh information comprising a current refresh period, a time remaining before refresh, an indication of read access, and an indication of write access, the indications updated by the logic circuit depending on whether the respective group of memory cells has been read accessed or write accessed during the current refresh period, the method comprising:
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scanning each respective auxiliary memory while decrementing the time remaining before refresh; and refreshing, if the time remaining before refresh is zero, each group of memory cells and reinitializing the time remaining before refresh to a value of the current refresh period. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of operating a dynamic random access memory comprising a plurality of groups of memory cells, and a respective auxiliary memory for each group of memory cells, the method comprising:
storing refresh information specific to each group of memory in the respective auxiliary memory. - View Dependent Claims (26, 27, 28)
Specification