ACCESS COUNT DEVICE, MEMORY SYSTEM, AND ACCESS COUNT METHOD
First Claim
1. An access count device comprising:
- a row-address storage unit that stores up to a specific number n (n is an integer equal to or more than
1) of row addresses specified in accesses to memory cells;
a counter that counts an access frequency to each row address stored in the row-address storage unit; and
a reset controller that notifies the row-address storage unit to replace one of the n row addresses with a new row address or discard one of the n row addresses, and also that notifies the counter to reset an access frequency to the row address replaced or discarded.
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Accused Products
Abstract
An access count device and the like in a semiconductor memory are disclosed, which count accesses to row addresses in the semiconductor memory with a smaller circuit scale. An access count device includes a row-address storage unit configured to store up to a specific number n (n is an integer equal to or more than 1) of row addresses specified in accesses to memory cells, a counter configured to count an access frequency to each row address stored in the row-address storage unit, and a reset controller configured to notify the row-address storage unit to replace one of the n row addresses with a new row address or discard one of the n row addresses, and also configured to notify the counter to reset an access frequency to the row address replaced or discarded.
50 Citations
10 Claims
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1. An access count device comprising:
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a row-address storage unit that stores up to a specific number n (n is an integer equal to or more than
1) of row addresses specified in accesses to memory cells;a counter that counts an access frequency to each row address stored in the row-address storage unit; and a reset controller that notifies the row-address storage unit to replace one of the n row addresses with a new row address or discard one of the n row addresses, and also that notifies the counter to reset an access frequency to the row address replaced or discarded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An access count method comprising:
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storing up to a specific number n (n is an integer equal to or more than
1) of row addresses specified in accesses to memory cells;counting an access frequency to each of the stored row addresses; replacing one of the n row addresses with a new row address or discarding the one of the n row addresses; and resetting the access frequency to the row address replaced or discarded.
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Specification