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:
Jul. 15, 1997
Filed:
Dec. 09, 1994
Applicant:
Inventor:
Kenneth A Dockser, San Jose, CA (US);
Assignee:
VLSI Technology Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395556 ; 395376 ;
Abstract
A microprocessor provides for a single-cycle and a dual-cycle instruction mode. In the single-cycle mode, certain instructions, e.g., a 'shift plus add' instruction, are performed in a single cycle with a relatively low clock rate. In the dual-cycle mode, the shift is performed in the first cycle and the add is performed in the second cycle with a relatively high clock rate. In the dual-cycle mode, a cycle can be dropped if the shift amount is zero or one of the operands is zero. A system designer and/or a programmer can select the mode to maximize throughput.