US 12,451,187 B2
Data storage device and method for inferring a read threshold using a time tag determination
David Avraham, San Jose, CA (US); Ariel Navon, Revava (IL); Alexander Bazarsky, Holon (IL); and Eran Sharon, Rishon Lezion (IL)
Assigned to Sandisk Technologies, Inc., Milpitas, CA (US)
Filed by Sandisk Technologies, Inc., Milpitas, CA (US)
Filed on Aug. 29, 2023, as Appl. No. 18/239,302.
Prior Publication US 2025/0078930 A1, Mar. 6, 2025
Int. Cl. G11C 16/08 (2006.01); G11C 16/10 (2006.01)
CPC G11C 16/08 (2013.01) [G11C 16/105 (2013.01)] 17 Claims
OG exemplary drawing
 
1. In a data storage device comprising a memory, a method comprising:
using firmware in the data storage device to infer a read threshold to use in reading a wordline in the memory, wherein the read threshold is inferred:
prior to the data storage device receiving a read command from a host that causes the wordline to be read;
only during a time and temperature update; and
based only on one or more inputs available during the time and temperature update, wherein a wordline number of the wordline is not one of the one or more inputs; and
in response to receiving the read command from the host:
looking up the wordline number in a pre-calibrated wordline zoning table comprising a plurality of predefined correction values associated with a respective plurality of wordline numbers;
modifying the inferred read threshold based on a correction value associated with the wordline number in the pre-calibrated wordline zoning table; and
using the modified inferred read threshold to read the wordline.