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. 06, 1992
Filed:
Aug. 24, 1990
Marshall Williams, Fremont, CA (US);
MASS Microsystems, Sunnyvale, CA (US);
Abstract
A two's complement multiplier is combined with additional circuit elements and implemented in an integrated circuit to provide a multiplier of selectively operating in two's complement or unsigned magnitude format. To achieve an unsigned magnitude product, the additional circuitry modifies or leaves unchanged the high-order half of the two's complement product as needed. Modification occurs when the most-significant bit of either or both multiplicand signals is a '1'. When a multiplicand signal has a most-significant bit of '1', the non-most significant bits of the other multiplicand signal are added to the two's complement product to derive the unsigned magnitude product. Such an implementation results in insignificant speed loss and comparatively minor increase in the required silicon area.