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:
Oct. 02, 1990
Filed:
Nov. 16, 1988
Shingo Kojima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A floating-point arithmetic processor performs a MASK or TRAP operation in response to occurrence of an exception. This processor includes a first flag which is set when the exception occurs, a second flag storing first data designating the MASK operation or second data designating the TRAP operation. A third flag is set when the first flag is set and the second flag is storing the second data. A controller produces a default value in response to the occurrence of the exception. The processor also includes a destination register, which is accessible by a central processing unit (CPU), and a transfer gate circuit which takes an open state to allow the default value to be stored into the destination register when the third flag is not set and a closed state to inhibit the default value to be stored into the destination register when the third flag is set.