US 11,749,333 B2
Memory system
Woongrae Kim, Gyeonggi-do (KR)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Nov. 19, 2021, as Appl. No. 17/531,424.
Claims priority of provisional application 63/123,703, filed on Dec. 10, 2020.
Claims priority of application No. 10-2021-0154680 (KR), filed on Nov. 11, 2021.
Prior Publication US 2022/0189538 A1, Jun. 16, 2022
Int. Cl. G06F 12/0811 (2016.01); G06F 12/14 (2006.01); G11C 11/406 (2006.01); G11C 29/42 (2006.01); G11C 29/44 (2006.01)
CPC G11C 11/40622 (2013.01) [G06F 12/0811 (2013.01); G06F 12/1433 (2013.01); G11C 11/40615 (2013.01); G11C 29/42 (2013.01); G11C 29/4401 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A memory system, comprising:
a normal memory area suitable for storing normal data;
a security memory area suitable for storing security data;
a first row hammering detection circuit suitable for sampling a portion of rows that are activated in the normal memory area and counting activation numbers of the sampled rows to select first rows to be refreshed among the sampled rows; and
a second row hammering detection circuit suitable for counting activation numbers of all rows in the security memory area to select second rows to be refreshed.