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:
Mar. 24, 1992
Filed:
Dec. 26, 1989
Applicant:
Inventors:
Charles F Studor, Austin, TX (US);
Robert Skruhak, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
36471508 ;
Abstract
A variable length shifter for performing multiple shift and select functions. The shifter has a number of cells equal to an operand length, ordered from a most significant to a least significant, or leftmost to rightmost. Each cell stores a bit of the operand, and is coupled to each adjacent cell and to a cell four bits adjacent in either direction, if any. In addition, each cell is coupled to a return bus for implementation of boundary conditions associated with the operation. Besides being expandable to an arbitrary size operand, the shifter implements a register select function using primarily existing circuitry.