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. 26, 1999
Filed:
Oct. 31, 1997
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A method for testing the functioning of a non-cacheable region within a cache having a cache controller programmed with a write-back write policy and a non-cacheable region included in an image memory region corresponding to a physical memory region. A first data pattern is written to the cache tagged at a first addressable location of a cacheable region in the physical memory region. A second data pattern is written to the cache tagged at a second addressable location in the image memory region contained within both the non-cacheable region and the cacheable region and corresponding to the first addressable location. The data stored in the cache and tagged at the first addressable location and corresponding to the non-cacheable region only of the second addressable location is read to determine whether the first data pattern remains in the cache thereby indicating that the non-cacheable region is functioning correctly. The data stored and tagged at a third addressable location in the physical memory region and corresponding to the cacheable region only of the second addressable location in the image memory region is read to determine whether the second data pattern remains in the cache tagged at the third addressable location thereby indicating that the non-cacheable region is functioning correctly and that the memory size of the non-cacheable region is correct.