Arithmetic logic unit for microprocessor with sign bit extend

Details Arithmetic logic unit for microprocessor with sign bit extend Arithmetic logic unit for microprocessor with sign bit extend

1991-09-30

1993-07-13

Malzahn, David H.

Boots, shoes, and leggings

364787, G06F 748, G06F 750

Patent

active

052279898

ABSTRACT:
An arithmetic logic unit for a microprocessor is shown and described for use in a 24-bit data path where the ALU includes three separate ALU portions, one for each byte of the data path, and three separate control signals, one for each portion of the ALU. The ALU provides a variety of arithmetic and logic functions for application to 24-bit operands, but also includes a capability of manipulating such operands in accordance with sign extended opcodes without actually physically executing a sign extend operation within the microprocessor. In this manner, the ALU executes the necessary logic functions to provide the same ultimate result as sign bit extension, but does not require a separate sign bit extension step within the microprocessor to convert signed byte operand into a signed word operand.

REFERENCES:
patent: 4263660 (1981-04-01), Prioste
patent: 4785393 (1988-11-01), Chu et al.
patent: 4888722 (1989-12-01), Boreland
patent: 5038315 (1991-08-01), Rao

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