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:
Oct. 19, 1999
Filed:
Mar. 27, 1997
David James Martens, Austin, TX (US);
Michael Kevin Ciraula, Round Rock, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A combined adder/decoder calculates a field within an effective address necessary to access a translation array. Rather than adding the full lengths of the previous fetch address and offset, only the bits corresponding to the field are added. A carry-in value from less significant bits is concurrently generated. Based on the sum result, two wordlines are chosen: the wordline corresponding to the sum result calculated and the next higher wordline. The carry-in value is used to select the appropriate wordline from the chosen pair. Because fewer bits are added and the carry-in need not be accounted for in the adder, the generation and decoding processes are faster and allow address translation to be started earlier in the processor cycle.