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:
Dec. 18, 1990
Filed:
Sep. 28, 1988
Robert G Gelinas, Westboro, MA (US);
Thomas V Radogna, Framingham, MA (US);
Data General Corporation, Westboro, MA (US);
Abstract
A system for use in a floating point computation unit for providing a sign/magniture subtraction operation, which system uses propagate/generate logic responsive to the subtraction operands to produce intermediate and final propagate and generate outputs. First carry computation logic is responsive to the final propagate and generate outputs and to a carry-in bit to produce final carry outputs and a carry-out bit. The latter outputs are used to produce a first subtraction result. Second carry computation logic responds to the intermediate propagate and generate outputs to produce second final carry outputs. The latter outputs and selected intermediate propagate outputs are used to produce a second subtraction result. The carry-out bit then selects one of the two subtraction results as the final subtraction result.