Invention Application
- Patent Title: SELECTIVE REFRESH MECHANISM FOR DRAM
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Application No.: US15644737Application Date: 2017-07-07
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Publication No.: US20190013062A1Publication Date: 2019-01-10
- Inventor: Francois Ibrahim ATALLAH , Gregory Michael WRIGHT , Shivam PRIYADARSHI , Garrett Michael DRAPALA , Harold Wade CAIN, III , Erik HEDBERG
- Applicant: QUALCOMM Incorporated
- Main IPC: G11C11/406
- IPC: G11C11/406 ; G06F12/128 ; G06F12/122 ; G06F12/0871

Abstract:
Systems and methods for selective refresh of a cache, such as a last-level cache implemented as an embedded DRAM (eDRAM). A refresh bit and a reuse bit are associated with each way of at least one set of the cache. A least recently used (LRU) stack tracks positions of the ways, with positions towards a most recently used position of a threshold comprising more recently used positions and positions towards a least recently used position of the threshold comprise less recently used positions. A line in a way is selectively refreshed if the position of the way is one of the more recently used positions and if the refresh bit associated with the way is set, or the position of the way is one of the less recently used positions and if the refresh bit and the reuse bit associated with the way are both set.
Public/Granted literature
- US2170693A Seamed article and process for making it Public/Granted day:1939-08-22
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