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:
Jul. 31, 2018
Filed:
Jul. 09, 2014
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Seiji Miura, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
A memory module includes: a first memory device that is volatile or non-volatile; a second memory device that is non-volatile; a third memory device that is non-volatile; and a controller that controls the first to third memory devices, wherein a capacity of the second memory device is larger than a capacity of the first memory device, and a capacity of the third memory device is larger than the capacity of the second memory device, a second upper limit value of the number of rewritings of the second memory device is larger than a third upper limit value of the number of rewritings of the third memory device, and a first upper limit value of the number of rewritings of the first memory device is larger than the second upper limit value of the number of rewritings of the second memory device, and the controller accesses the second memory device with reference to a first address translation table related to the second memory device stored in the first memory device, and accesses the third memory device with reference to a second address translation table related to the third memory device stored in the second memory device.