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:
Feb. 19, 2008
Filed:
Jul. 18, 2005
Tetsuya Shimomura, Hitachi, JP;
Shigeru Matsuo, Hitachinaka, JP;
Koyo Katsura, Hitachiota, JP;
Tatsuki Inuzuka, Hitachi, JP;
Yasuhiro Nakatsuka, Koganei, JP;
Tetsuya Shimomura, Hitachi, JP;
Shigeru Matsuo, Hitachinaka, JP;
Koyo Katsura, Hitachiota, JP;
Tatsuki Inuzuka, Hitachi, JP;
Yasuhiro Nakatsuka, Koganei, JP;
Renesas Technology Corporation, Tokyo, JP;
Abstract
In order to reduce degradation of the processing performance of the data processor due to use of a part of the main memory as a display frame buffer, when an access request to the memoryis generated from the CPU, the memory controllerholds it once, requests the display controllerto stop the access to the memorywhich is in execution, when data to the access executed already is transferred from the memory, holds it, and transfers the access request from the CPU buswhich is held by the memory. When the access from the CPU busends, the memory controllerrestarts the access stopped in the display controllerand passes the held data to the display controller