US 12,334,133 B2
Row hammer refresh operation
John Christopher M. Sancon, Boise, ID (US)
Assigned to Micron Technology, Inc., Boise, ID (US)
Filed by Micron Technology, Inc., Boise, ID (US)
Filed on Oct. 4, 2022, as Appl. No. 17/959,664.
Claims priority of provisional application 63/348,465, filed on Jun. 2, 2022.
Prior Publication US 2023/0395121 A1, Dec. 7, 2023
Int. Cl. G11C 11/406 (2006.01); G11C 11/4078 (2006.01)
CPC G11C 11/40618 (2013.01) [G11C 11/40615 (2013.01); G11C 11/4078 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a plurality of dies each comprising a plurality of arrays of memory cells of a memory device, wherein at least one of the plurality of dies but less than all of the plurality of dies, is a row hammer die, including access circuitry to detect and monitor a quantity of access groups of memory cells, and capable of performing a deterministic row hammer refresh; and
a memory controller coupled to the array of memory cells, the memory controller configured to:
perform a number of operations on the array of memory cells;
detect a quantity of accesses associated with the row hammer die and based on the number of operations performed; and
in response to detection of a threshold quantity of accesses of a group of memory cells in the row hammer die, perform a refresh operation on a group of memory cells in an additional die of the plurality of dies.