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. 15, 2008
Filed:
Nov. 23, 2005
Takeshi Shimada, Kawasaki, JP;
Tatsuru Nakagaki, Kawasaki, JP;
Akihiro Kobayashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Data transmission for writing data into a shared memory is performed by a high-speed dedicated line provided between each processor and the shared memory. When a processor performs writing to a shared memory space, the processor notifies an update notification bus corresponding to the conventional global bus, to which address the update is to be performed. The other processors which have detected this notification inhibit access to that address and wait for the write data to be sent to the address via the dedicated line. When the data has arrived, the data is written into the corresponding address. Here, the data is also written into the corresponding address, thereby maintaining the cache coherency. Moreover, when transmitting a write address, it is necessary to acquire the bus use right while data transmission is performed by using the dedicated line, which significantly reduces the time required for acquiring the bus use right.