Invention Grant
- Patent Title: Preservation circuit and methods to maintain values representing data in one or more layers of memory
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Application No.: US16657329Application Date: 2019-10-18
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Publication No.: US10971227B2Publication Date: 2021-04-06
- Inventor: Christophe Chevallier , Robert Norman
- Applicant: Unity Semiconductor Corporation
- Applicant Address: US CA Sunnyvale
- Assignee: Unity Semiconductor Corporation
- Current Assignee: Unity Semiconductor Corporation
- Current Assignee Address: US CA Sunnyvale
- Agency: Lowenstein Sandler LLP
- Main IPC: G11C13/00
- IPC: G11C13/00 ; G11C5/02 ; G11C11/16 ; G11C5/00

Abstract:
Circuitry and methods for restoring data in memory are disclosed. The memory may include at least one layer of a non-volatile two-terminal cross-point array that includes a plurality of two-terminal memory elements that store data as a plurality of conductivity profiles and retain stored data in the absence of power. Over a period of time, logic values indicative of the stored data may drift such that if the logic values are not restored, the stored data may become corrupted. At least a portion of each memory may have data rewritten or restored by circuitry electrically coupled with the memory. Other circuitry may be used to determine a schedule for performing restore operations to the memory and the restore operations may be triggered by an internal or an external signal or event. The circuitry may be positioned in a logic layer and the memory may be fabricated over the logic layer.
Information query