The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 2020
Filed:
Apr. 08, 2016
Ultramemory Inc., Tokyo, JP;
Yasutoshi Yamada, Tokyo, JP;
Ryuji Takishita, Tokyo, JP;
Ultramemory Inc., Tokyo, JP;
Abstract
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.