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:
Sep. 13, 2005
Filed:
Sep. 26, 2002
Applicants:
Takanobu Naruse, Nagoya, JP;
Shinichi Yoshioka, Koganei, JP;
Norio Nakagawa, Tokyo, JP;
Inventors:
Assignees:
Renesas Technology Corp., Tokyo, JP;
Hitachi ULSI Systems Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F013/28 ;
U.S. Cl.
CPC ...
Abstract
A DMA controller including a request queue for holding DMA transfer requests clears only the request queue without executing unnecessary DMA transfers and provides information about the states of the queue. A DMA controller is configured to enable data transfer control with respect to plural channels and includes a request queue capable of holding the identification information of channels concerned in plural data transfer requests, wherein the states of the request queue can be outputted and information held in the request queue can be cleared.