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:
Aug. 16, 1977
Filed:
Sep. 25, 1974
Ronald Hans Gruner, Framingham, MA (US);
Carl Justin Alsing, Hopkinton, MA (US);
Data General Corporation, Westboro, MA (US);
Abstract
A microprogrammed processor in which control signals for data paths, the ALU function, the shifter and all other control signals are derived from the current microprogram control word which is normally periodically clocked into a ROM buffer. The processor provides for microbranching capability with and/or without a test, testing capabilities including direct addressing with simultaneous temporary address storage capability for future recall, and selective testing of computer instruction bits for decoding to address the next micro-instruction. Additional capabilities provide for flexible access to the micro-code instruction control store through a ROM address multiplexer which allows for selection of at least one of four possible micro-instruction addresses determined by micro-code control decode logic. The above functions are accomplished with a fifty-six bit micro-instruction format implemented with a sixteen bit word length, which allows for a flexible instruction set for a microprogrammed processor enabling a system to be designed to span the range from a minicomputer to a large processor.