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:
Dec. 14, 1999
Filed:
Dec. 10, 1997
Applicant:
Inventor:
Junji Mori, Kanagawa-ken, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
714 30 ; 714 47 ; 714 48 ; 714718 ;
Abstract
A test facilitating circuit of a microprocessor has a mode register (11). If data stored in the mode register indicates a test mode, the test facilitating circuit uses a test mode function of a cache memory (1), to execute a test program written in the cache memory irrespective of the resetting of the microprocessor. The test program carries out a built-in test on internal circuits of the microprocessor. Results of the test are stored in the cache memory. After the test, an external tester reads the test results out of the cache memory and examines them.