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:
Feb. 29, 2000
Filed:
Oct. 31, 1997
Takao Kishi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a multiprocessor system where a shared expansion memory and a number of loosely coupled clusters are provided, each cluster comprises at least one CPU and a main memory connected to a system bus, and an address memory. During system initialization, a configuration table is created in the main memory, and an expansion memory location is accessed and status of the access is received. If the access status indicates that the access is successful, the address of the memory location is written into the address memory. Otherwise, an inaccessibility indication is stored in the configuration table to prevent the operating system from accessing that expansion memory location. During read/write operation, when an address of the expansion memory is received from the system bus, the address memory is searched for an address corresponding to the received address. If the received address has a corresponding address in the address memeory, data is tranferred between the expansion memory and the system bus. If an error is detected when accessing an expansion memory locatio during the read/write operation, the address of that location is removed from the address memory and the system is restarted for initialization.