公开(公告)号：US20200098420A1

公开(公告)日：2020-03-26

申请号：US16137496

申请日：2018-09-20

Applicant: QUALCOMM INCORPORATED

Inventor： Yanru Li ,  Dexter Chun ,  Pratik Patel

IPC: G11C11/406 ,  G06F3/06

Abstract: Systems, methods, and computer programs are disclosed for refreshing a volatile memory. An embodiment of a method comprises storing, in a volatile memory device comprising a cell array having a plurality of rows with a correspond ng row address, a table specifying one of a data valid indicator and a data invalid indicator for each of the plurality of row addresses. The data valid indicator specifies that the corresponding row is in use, and the data invalid indicator specifies that the corresponding row is not in use. A memory controller initiates a refresh command. In response to the refresh command, the rows having the data valid indicator are refreshed while the rows having the data invalid indicator are skipped.

公开(公告)号：US09754655B2

公开(公告)日：2017-09-05

申请号：US15340266

申请日：2016-11-01

Applicant: QUALCOMM Incorporated

Inventor： Mosaddiq Saifuddin ,  SankaraRao Kunapareddy ,  Keunsoo Roh ,  Chun Xiang He ,  Pratik Patel ,  Nicholas Ambur ,  Jeremy Haugen

IPC: G11C16/06 ,  G11C11/406 ,  G11C7/10 ,  G11C11/408 ,  G06F13/16 ,  G06F1/32

CPC classification number: G11C11/40615 ,  G06F1/3225 ,  G06F1/3275 ,  G06F13/1636 ,  G11C7/1072 ,  G11C11/40611 ,  G11C11/40618 ,  G11C11/40622 ,  G11C11/4087

Abstract: In an embodiment, a dynamic random-access memory (DRAM) system configures an inactive portion of a DRAM die to operate in accordance with a self-refresh mode that is characterized by refreshes of the DRAM die being controlled by a local DRAM die controller integrated into the DRAM die. The DRAM system also configures an active portion of the DRAM die to operate in accordance with a controller-managed refresh mode while the inactive portion of the DRAM die operates in the self-refresh mode, the controller-managed refresh mode characterized by refreshes of the DRAM die being controlled by a controller that is external to the DRAM die.