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. 31, 2001
Filed:
Dec. 07, 1998
Applicant:
Inventors:
Anthony M. Petro, Austin, TX (US);
James S. Blomgren, Austin, TX (US);
Assignee:
Intrinsity, Inc., Austin, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 7/50 ;
U.S. Cl.
CPC ...
G06F 7/50 ;
Abstract
An apparatus that takes two N-nary operands and selectably performs either addition or subtraction on them to produce an arithmetic result and a carry indicator. Carry-lookahead logic is utilized to create HPG signals for each N-nary dit of the intermediate sum of the two operands and also to create “block” HPG indicators for blocks of dits. In the preferred 1-of-4 embodiment, subtraction may be implemented as four's complement addition. The value of each dit of the intermediate sum is incremented by one before final output if a carry has propagated into the dit.