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:
Sep. 16, 2008
Filed:
Mar. 22, 2005
Conrado Blasco Allue, Austin, TX (US);
Paul Kimelman, Alamo, CA (US);
Andrew Brookfield Swaine, Cambridge, GB;
Richard Roy Grisenthwaite, Cambridgeshire, GB;
Conrado Blasco Allue, Austin, TX (US);
Paul Kimelman, Alamo, CA (US);
Andrew Brookfield Swaine, Cambridge, GB;
Richard Roy Grisenthwaite, Cambridgeshire, GB;
ARM Limited, Cambridge, GB;
Abstract
A data processing systemis described having a central processing unitand a diagnostic mechanismThe central processing unitis switchable into a power-down mode from which it may resume into a normal operation mode. When the central processing unitresumes into the normal operation mode, execution of program instructions is inhibited by the diagnostic mechanismto allow the diagnostic mechanism to be appropriately programmed such that the immediate power-up code and operations can be properly diagnosed. The requirement to prevent program instruction execution on power-up is programmed by writing to a latchwithin the diagnostic mechanismprior to the power-down. The prevention of program execution may be achieved, for example, by generation of a halt request or by extending the time period for which the central processing unitis held in reset following power-up.