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. 29, 2013
Filed:
Apr. 27, 2011
Greg M. Hess, Mountain View, CA (US);
Naveen Javarappa, San Jose, CA (US);
Greg M. Hess, Mountain View, CA (US);
Naveen Javarappa, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
An apparatus and method for isolating circuitry from one power domain from that of another power domain prior to performing a power down operation is disclosed. In one embodiment, circuitry in a first power domain is coupled to receive signals based on outputs from circuitry in a second power domain. The signals may be conveyed to the circuitry in the first power domain via passgate circuits. When powering down the circuitry of the first and second power domains, a control circuit may first deactivate the passgate circuits in order to isolate the circuitry of the first power domain from that of the second power domain. The circuitry in the second power domain may be powered off subsequent to deactivating the passgate circuits. The circuitry in the first power domain may be powered off subsequent to powering off the circuitry in the second power domain.