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. 03, 2013
Filed:
Jul. 06, 2012
Herbert A. Little, Waterloo, CA;
Jerrold R. Randell, Waterloo, CA;
Richard C. Madter, Puslinch, CA;
Ryan J. Hickey, Waterloo, CA;
Herbert A. Little, Waterloo, CA;
Jerrold R. Randell, Waterloo, CA;
Richard C. Madter, Puslinch, CA;
Ryan J. Hickey, Waterloo, CA;
BlackBerry Limited, Waterloo, Ontario, CA;
Abstract
The present invention provides a secure JTAG interface to an application-specific integrated circuit (ASIC). In the preferred embodiment the invention operates through the combined efforts of a Security Module (SM) comprising a state machine that controls the security modes for the ASIC, and a Test Control Module (TCM) which contains the JTAG interface. The TCM operates in either a restricted mode or an unrestricted mode, depending on the state of the SM state machine. In a restricted mode, only limited access to memory content is permitted. In an unrestricted mode, full access to memory content is permitted.