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:
Jan. 28, 1997
Filed:
Dec. 22, 1994
Judah L Adelman, Jerusalem, IL;
Paul Marino, Kfar-Saba, IL;
Avner Goren, Rosh-Haayin, IL;
Garth Hillman, Austin, TX (US);
Motorola Inc., Schaumburg, IL (US);
Abstract
A data ALU (arithmetic logic unit) (54) in a data processing system (20) performs both 24-bit arithmetic, and 16-bit exact arithmetic (including shifting and logical operations) using the same hardware. For a multiply/accumulate operation in 16-bit exact mode, shifting operations are used to align the operands so that 16-bit exact mode is transparent to a user. An entire instruction set can be executed in 24-bit mode or 16-bit exact mode. The same instructions and hardware are used in both modes. A transition between modes is performed by changing a status bit (97) in a status register (95).