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:
Apr. 06, 2004
Filed:
Nov. 26, 2001
Tetsuya Shimomura, Hitachi, JP;
Shigeru Matsuo, Hitachinaka, JP;
Koyo Katsura, Hitachiota, JP;
Tatsuki Inuzuka, Hitachi, JP;
Yasuhiro Nakatsuka, Koganei, JP;
Hitachi, Ltd., 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 memory is generated from the CPU , the memory controller holds it once, requests the display controller to stop the access to the memory which 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 bus which is held by the memory . When the access from the CPU bus ends, the memory controller restarts the access stopped in the display controller and passes the held data to the display controller