US 12,248,683 B2
Storage device and operating method of controller
Sang Ho Yun, Gyeonggi-do (KR); and Jang Seob Kim, Gyeonggi-do (KR)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Nov. 25, 2022, as Appl. No. 17/994,080.
Claims priority of application No. 10-2021-0164481 (KR), filed on Nov. 25, 2021; and application No. 10-2022-0128781 (KR), filed on Oct. 7, 2022.
Prior Publication US 2023/0305715 A1, Sep. 28, 2023
Int. Cl. G11C 29/50 (2006.01); G06F 3/06 (2006.01)
CPC G06F 3/0619 (2013.01) [G06F 3/0653 (2013.01); G06F 3/0679 (2013.01); G11C 29/50004 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A storage device comprising:
a memory device including a memory region which includes a first sub-region and a second sub-region; and
a controller configured to:
read assist data from a plurality of memory cells according to an assist read voltage during a read voltage adjusting operation on the first sub-region as a target sub-region, and
re-utilize the read assist data during the read voltage adjusting operation on the second sub-region as the target sub-region,
wherein the controller is further configured to:
read data from the target sub-region according to a target read voltage,
determine, based on the data and the assist data, a number of memory cells corresponding to the target read voltage, and
adjust the target read voltage based on the number of memory cells and an expected number of memory cells.