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:
Nov. 29, 1994
Filed:
Jan. 12, 1993
Fuyuki Okamoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Apparatus for use in a floating-point and fixed-point adder-subtractor assembly. The apparatus includes a comparator and selector circuit disposed prior to an adder-subtracter for determining a larger and smaller operand prior to the addition and subtraction operation. The comparator and selector circuit inputs the larger operand into a first predetermined input of the adder-subtracter and the smaller operand into a second predetermined input of the adder-subtracter. Additionally, first and second selector circuits may be provided for multiplexing first and second fixed point data operands into the first and second inputs of the adder-subtracter, respectively. A shifter is provided for shifting at least one of the operands prior to inputting the operand into the adder-subtracter for selectively performing a position alignment. Accordingly, a simplified structure provides fixed-point and floating-point data addition-subtraction in a highly efficient manner.