Circuit for selecting row to be refreshed
AssigneesSK hynix Inc., Seoul National University R&Db Foundation
InventorsSung-Joo Yoo, Mun-Gyu Son
Life of this patent
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Abstract
A circuit for selecting a row of memory cells of a memory device to be refreshed may include: a cold table suitable for storing as a cold row a row selected as a hammered row when the row selected as the hammered row is neither one of cold rows stored in the cold table nor one of hot rows stored in a hot table; and the hot table suitable for storing, as a hot row, the row selected as the hammered row when the row selected as the hammered row is one of the cold rows stored in the cold table.
Claims20
A circuit for selecting a row of memory cells of a memory device to be refreshed, comprising:
- a cold table suitable for storing as a cold row a row selected as a hammered row when the row selected as the hammered row is neither one of cold rows stored in the cold table nor one of hot rows stored in a hot table;
- and
- the hot table suitable for storing, as a hot row, the row selected as the hammered row when the row selected as the hammered row is one of the cold rows stored in the cold table,
- wherein the hot rows stored in the hot table have respective ranks,
- wherein a lowest rank is applied to a new hot row stored in the hot table for the first time, and
- wherein, when the row selected as the hammered row is one of the hot rows, the rank of the row selected as the hammered row is raised to the next rank level.
A circuit for selecting a row to be refreshed, comprising:
- a cold table suitable for storing a plurality of cold rows having respective ranks;
- a hot table suitable for storing a plurality of hot rows having respective ranks;
- an input unit suitable for storing, as a cold row of a highest rank of the cold table, a row selected as a hammered row when the row selected as the hammered row is neither one of the cold rows nor one of the hot rows;
- a promotion unit suitable for storing, as a hot row of a lowest rank of the hot table, the row selected as the hammered row when the row selected as the hammered row is one of the cold rows, and raising the rank of the hammered row when the row selected as the hammer row is one of the hot rows;
- and
- an eviction unit suitable for removing one of the cold rows of the cold table if the cold table is in a full state when a new cold row is stored in the cold table.
Dependencies are inferred from the claim text.