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:
Sep. 15, 1992
Filed:
Feb. 03, 1989
David B Fite, Northboro, MA (US);
John E Murray, Acton, MA (US);
Tryggve Fossum, Northboro, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
An instruction decoder for a pipelined data processing unit simultaneously decodes two source specifiers and one destination specifier. All three of the specifiers can be register specifiers in which the specified operand is the content of a specified register. Any one of the specifiers can be a complex specifier designating an index register, a base register, and a displacement. Any one of the source specifiers can specify short literal data. Data for locating the two source operands and the destination operand are transmitted over parallel buses to an execution unit, so that most instructions are executed at a rate of one instruction per clock cycle. The complex specifier can have a variable length determined by its data type as well as its addressing mode. In particular, the complex specifier may specify a long length of extended immediate data that is received through the instruction buffer over a number of clock cycles.