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1. (WO2018200298) DELAYED WRITE-BACK IN MEMORY WITH CALIBRATION SUPPORT

Pub. No.:    WO/2018/200298    International Application No.:    PCT/US2018/028250
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Fri Apr 20 01:59:59 CEST 2018
IPC: G11C 16/22
Applicants: EVERSPIN TECHNOLOGIES, INC.
Inventors: ALAM, Syed, M.
Title: DELAYED WRITE-BACK IN MEMORY WITH CALIBRATION SUPPORT
Abstract:
A memory having a delayed write-back to the array of data corresponding to a previously opened page allows delays associated with write-back operations to be avoided. After ail initial activation opens a first page and the read/write operations for that page are complete, write-back of the open page to the array of memory cells is delayed until after completion of a subsequent activate operation that opens a new page. Techniques to force a write-back in the absence of another activate operation are also disclosed. Calibration and testing sequences are also supported in which a non-destructive mode preserves data stored in a non-volatile memory array and status bits used to indicate open pages are cleared so later inadvertent delayed write-back operations as a result of the calibration or testing do not corrupt the non- volatile data.