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. 15, 2011
Filed:
Sep. 21, 2009
Hugo Cheung, Tucson, AZ (US);
LU Yuan, Tucson, AZ (US);
Terence Chiu, Tucson, AZ (US);
Bolanle Oladapo Onodipe, Fort Worth, TX (US);
Hugo Cheung, Tucson, AZ (US);
Lu Yuan, Tucson, AZ (US);
Terence Chiu, Tucson, AZ (US);
Bolanle Oladapo Onodipe, Fort Worth, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
There are various methods of securing programs and data on a processor. The external address enable pin of the processor is sampled upon a power-on or reset to the processor, to determine whether or not accesses to external memory are allowed. Other changes to the external address enable pin are thereafter ignored. In addition, if it is determined that an internal memory access is occurring, the contents of such an access can be masked to prevent unauthorized viewing of the memory contents via an external memory bus. In addition, a programmable security bit may be set to disable the dumping of flash memory contents, allowing only the erasing of the flash memory.