US 12,481,431 B2
Memory controller, memory system including the same, and operation method of memory controller for performing read operation based on read voltage level
Haedong No, Suwon-si (KR); Youjin Jeon, Suwon-si (KR); Minjin Jo, Suwon-si (KR); and Younsoo Cheon, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Dec. 11, 2023, as Appl. No. 18/535,459.
Claims priority of application No. 10-2023-0020120 (KR), filed on Feb. 15, 2023.
Prior Publication US 2024/0272808 A1, Aug. 15, 2024
Int. Cl. G06F 12/00 (2006.01); G06F 3/06 (2006.01); G11C 11/56 (2006.01); G11C 16/04 (2006.01); G11C 16/26 (2006.01)
CPC G06F 3/0619 (2013.01) [G06F 3/0659 (2013.01); G06F 3/0679 (2013.01); G11C 11/5642 (2013.01); G11C 11/5671 (2013.01); G11C 16/0483 (2013.01); G11C 16/26 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of operating a memory controller for controlling a memory device including memory cells, the method comprising:
transmitting a valley search command to the memory device;
obtaining a cell count value and a valley voltage level from the memory device;
obtaining an offset value by searching an offset table based on the cell count value and the valley voltage level;
determining a read voltage level based on the valley voltage level and the offset value; and
controlling the memory device to perform a read operation based on the read voltage level,
wherein the cell count value indicates a number of memory cells belonging to a threshold voltage region adjacent to the valley voltage level,
wherein the obtaining of the offset value from the offset table comprises:
identifying a first offset value as the offset value based on the cell count value being included in a first cell count section, among a plurality of cell count sections; and
identifying a second offset value as the offset value based on the cell count value being included in a second cell count section, among the plurality of cell count sections,
wherein cell count values belonging to the second cell count section are greater than cell count values belonging to the first cell count section, and
wherein the second offset value is less than the first offset value.