US 11,782,831 B2
Managing power loss in a memory device
Huapeng G. Guan, Redwood City, CA (US); Frederick Adi, Castro Valley, CA (US); Jiangli Zhu, San Jose, CA (US); Yipei Yu, San Francisco, CA (US); Venkata Naga Lakshman Pasala, Milpitas, CA (US); and Wei Wang, Dublin, CA (US)
Assigned to Micron Technology, Inc., Boise, ID (US)
Filed by Micron Technology, Inc., Boise, ID (US)
Filed on Sep. 1, 2021, as Appl. No. 17/464,350.
Prior Publication US 2023/0065617 A1, Mar. 2, 2023
Int. Cl. G06F 12/0804 (2016.01); G06F 12/1009 (2016.01)
CPC G06F 12/0804 (2013.01) [G06F 12/1009 (2013.01); G06F 2212/1032 (2013.01); G06F 2212/657 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system comprising:
a plurality of memory devices comprising a volatile memory device and a non-volatile memory device; and
a processing device, operatively coupled with the plurality of memory devices, to perform operations comprising:
saving a snapshot of a logical-to-physical (L2P) table to a non-volatile memory device;
responsive to detecting a power up event, initializing a slot of a physical super management unit (PSMU) in a portion of a dedicated area of the non-volatile memory device by writing a sequence number into a first management unit (MU) of the slot in the portion of the dedicated area wherein the sequence number identifies a record of an update journal;
maintaining at least one journal of updates of the L2P table comprising a plurality of entries wherein each entry records a change to the L2P table,
responsive to a parameter of a journal buffer of the volatile memory device satisfying a threshold criterion, saving the at least one journal of updates of the L2P table to the non-volatile memory device;
responsive to detecting a power loss event, retrieving the sequence number from the dedicated area; and
saving a most recent set of updates of the L2P table to the portion of the dedicated area of the non-volatile memory device, wherein the portion of the dedicated area is identified by the sequence number.