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:
Aug. 21, 2007
Filed:
Jun. 28, 2006
Naoki Mitsuishi, Kodaira, JP;
Naoki Mitsuishi, Kodaira, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
It is aimed at improving the efficiency of data transfer processing and the concurrent data processing on a central processing unit. A data transfer device can independently request a bus access right and output an address to a first bus (IBUS) and a second bus (PBUS). It is possible to solve the state of competing for the bus access right between both buses. While the bus access right of one bus is granted for reading or writing, the bus access right of the other bus can be released. When the data transfer device releases the bus access right for the first bus, a central processing unit can process data. In response to one data transfer start request, the bus access right is requested for one bus and the other bus, There is not used a sequence of requesting the bus access right in response to different data transfer requests for respective buses. It is possible to simplify a handshake sequence of a data transfer request and its acknowledgment.