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:
Mar. 18, 2014
Filed:
Dec. 16, 2009
Naohiro Kiyota, Kawasaki, JP;
Naohiro Kiyota, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
According to an aspect of the embodiment, an FP includes a plurality of entries which holds requests to be processed, and each of the plurality of entries includes a requested flag indicating that data transfer is once requested. An FP-TOQ holds information indicating an entry holding the oldest request. A data transfer request prevention determination circuit checks the requested flag of a request to be processed and the FP-TOQ, and when a transfer request of data as a target of the request to be processed has already been issued and the entry holding the request to be processed is not the entry indicated by the FP-TOQ, transmits a signal which prevents the transfer request of the data to a data transfer request control circuit. Even when a cache miss occurs in a primary cache RAM, the data transfer request control circuit does not issue a data transfer request when the signal which prevents the transfer request is received.