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. 26, 2008
Filed:
Feb. 18, 2005
Go Sugizaki, Kawasaki, JP;
Go Sugizaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A system control apparatus and method capable of increasing the possibility of recovery from a synchronization error in snooping between system controllers are provided. The system control apparatus has a local port that holds a memory access request received externally and reoutputs it in response to an error retry instruction. A broadcast output section broadcasts the memory access request. A broadcast input section receives the broadcast memory access request. A global port holds the received memory access request. A snoop control section transmits and receives cache status information containing a result of snooping, and detects a synchronization error on the basis of the cache status information. If a synchronization error occurs, the snoop control section outputs the error retry instruction to the local port holding the memory access request that resulted in the synchronization error.