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. 20, 1994
Filed:
Mar. 07, 1994
Applicant:
Inventor:
Donald C Anderson, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364787 ;
Abstract
A high-speed adder using a varied carry scheme, such as one of the carry-lookahead (CLA) type (30), includes a plurality of adder groups (32-37) each receiving some bits of two input operands. The adder groups are not identical but instead each adder group reduces a delay which is critical to its order. A least significant adder group (32) reduces a delay from operand input to carry output. A most-significant group (37) reduces a delay from carry input to sum output. Intermediate groups (33-36) reduce a delay from carry input to carry output.