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:
Aug. 06, 1996
Filed:
Dec. 06, 1994
Applicant:
Inventor:
Robert C Frame, Westboro, MA (US);
Assignee:
Digital Equipment Corporation, Maynard, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395471 ; 395472 ; 395483 ;
Abstract
An apparatus and method for caching SMRAM in an Intel.RTM. CPU employing system management mode. A cache for the CPU includes a plurality of data entries and an SMRAM status bit corresponding to each data entry. The SMRAM status bit is set if the data entry holds data in SMRAM, and reset if the data entry does not hold data in SMRAM. The SMRAM status bit distinguishes SMRAM data from system memory data in the cache, thereby eliminating cache coherency problems.