Programmable multi-bit shifter

Details Programmable multi-bit shifter Programmable multi-bit shifter

1977-06-20

1979-04-10

Shaw, Gareth D.

Boots, shoes, and leggings

364200, G06F 700

Patent

active

041492633

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.

REFERENCES:
patent: 3133268 (1964-05-01), Avakiah et al.
patent: 3887799 (1975-06-01), Lindgren
patent: 3988717 (1976-10-01), Kisyka
patent: 3997771 (1976-12-01), Periowski et al.

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