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:
Jul. 14, 1998
Filed:
Mar. 17, 1995
Kenichi Nabeya, Kawasaki, JP;
Tatsumi Nakada, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a computer system having a coprocessor dedicated to arithmetic operations, one of the coprocessor and CPU is equipped with an abnormality decision section and the other is equipped with a transmission section which transmits to the abnormality decision section signals by which the abnormality decision section is permitted to decide whether abnormality has occurred. In a first arrangement, upon detecting that an instruction transferred from the CPU is abnormal, the coprocessor turns off a flag indicating that it is active. In the CPU, its internal storage state indicates that the coprocessor is active and the flag is received which indicates that the coprocessor is inactive. Thereby, the CPU is permitted to decide that abnormality has occurred. In a second arrangement, upon detecting abnormality, the coprocessor turns off that flag indicating that it is active and turns on a flag indicating that the buffer is full. By receiving this signal state which cannot usually exist, the CPU is permitted to decide that abnormality has occurred.