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:
Jan. 18, 2022
Filed:
Sep. 10, 2020
Applicant:
Hitachi, Ltd., Tokyo, JP;
Inventors:
Yuusaku Kiyota, Tokyo, JP;
Hideaki Monji, Tokyo, JP;
Assignee:
HITACHI, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 13/28 (2006.01); G06F 12/0804 (2016.01); G06F 13/16 (2006.01);
U.S. Cl.
CPC ...
G06F 13/28 (2013.01); G06F 12/0804 (2013.01); G06F 13/1668 (2013.01); G06F 2212/1008 (2013.01);
Abstract
A data transfer system including a first memory and a processor includes a second memory and a DMA controller. The processor performs RMW on data which has a size less than a cache line size and in which a portion of a cache line (a unit area of the first memory) is a write destination. Output target data is transferred from an I/O device to the second memory. Thereafter, the DMA controller transfers the output target data from the second memory to the first memory in one or a plurality of transfer unit sizes by which the number of occurrences of RMW is minimized.