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:
Apr. 10, 1979
Filed:
Jun. 20, 1977
Jerry E Prioste, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A versatile programmable multi-bit shifter is provided which can be built on a single monolithic integrated circuit. The shifter is capable of performing arithmetic shift left, arithmetic shift right, rotate left, rotate right, shifting right using two's complement, shifting left using two's complement, forcing the output to a predetermined logic level, or placing a sign bit at all the outputs. The programmable multi-bit shifter comprises an input data multiplexer for receiving input data and an output multiplexer coupled to the input multiplexer. The output multiplexer provides the data output for the shifter. A decoder is also provided for decoding shift function inputs. A second decoder is provided for decoding scale factor shift inputs. Outputs of the second decoder are coupled to the input data multiplexer and to the output data multiplexer and also to a sign select logic circuitry. The sign select logic circuitry combines inputs from both decoders to control operation of the output multiplexer. The shifter has reduced part count and provides high-speed implementation along with greater flexibility for the user.