Ultramemory Assigned Patent

Ultramemory Inc., Tokyo, Japan, has been assigned a patent (10,861,530) developed by Yamada, Yasutoshi, and Takishita, Ryuji, Tokyo, Japan, for a “semiconductor storage device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The purpose of the present invention is to achieve a system for solving a row hammer issue without significantly increasing a DRAM chip area. A semiconductor storage device comprises: a memory unit including a plurality of memory cells, an address latch unit that receives an active command and an address therefor, and latches and holds the address every time the active command is received, a refresh control unit that, when receiving a refresh command, instructs a memory access control unit to carry out a regular refresh operation while instructing the memory access control unit to carry out an interrupt refresh operation for an address near the address latched by the address latch unit, and the memory access control unit that carries out the regular refresh operation and the interrupt refresh operation for the memory unit on the basis of the instruction from the refresh control unit.”

The patent application was filed on April 8, 2016 (16/090,716).