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:
Nov. 03, 1998
Filed:
Jan. 26, 1996
Applicant:
Inventor:
Bruce Ernest Whittaker, Mission Viejo, CA (US);
Assignee:
Unisys Corporation, Blue Bell, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395471 ; 395445 ; 395449 ; 371 492 ; 371 494 ; 364D / ;
Abstract
A multi-set cache structure, providing a first-level cache and second level cache to a processor, stores data words where each word holds two bytes and two status bits. Each cache set includes a Tag RAM for holding the address data words and a Parity RAM holding a parity bit for each byte and a parity bit for the two status bits. A programmable array logic control unit has a predictive generator logic unit to generate the proper 'status parity bit' for each set of status bits (V,R) without need for waiting to calculate the status parity bit from the existing values of the two status bits.