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. 29, 1986
Filed:
Oct. 03, 1983
H Bruce Butts, Jr, Seattle, WA (US);
David N Cutler, Mercer Island, WA (US);
Peter C Schnorr, Redmond, WA (US);
Robert T Short, Woodinville, WA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A central processing unit for a digital computer has a central memory unit connected to a system bus. A data path unit decodes variable length microinstructions that are stored in the central memory unit and that include an operation code and one or more operand specifiers, issuing a microaddress of one of a set of microinstructions stored in a control store. The microinstructions have a data path control field, a condition/size field and a next address control field. A microinstruction logic control is responsive to the microinstructions, and a memory control unit that includes a data cache memory array operates asynchronously with respect to the data path unit, translating virtual memory addresses to access data from the data cache memory array or from the central memory unit.