US 12,228,989 B2
System-on-chip with DVFM protection circuit
Doron Rajwan, Rishon Lezion (IL); Ami Schwartzman, Kfar Saba (IL); and Lior Zimet, Kerem Maharal (IL)
Assigned to Apple Inc, Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Nov. 29, 2023, as Appl. No. 18/522,324.
Application 18/522,324 is a continuation of application No. 17/673,870, filed on Feb. 17, 2022, granted, now 11,836,026.
Prior Publication US 2024/0201766 A1, Jun. 20, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 1/28 (2006.01)
CPC G06F 1/28 (2013.01) 18 Claims
OG exemplary drawing
 
1. A system, comprising:
multiple hardware circuits, which are coupled to respective power domains having respective sets of domain-specific power settings; and
protection circuitry, configured to:
monitor requests in which one or more of the hardware circuits request transitions between the domain-specific power settings;
determine, from among multiple system-level combinations of the domain-specific power settings, a subset of system-level combinations that could potentially be traversed in performing the requested transitions; and
grant the requested transitions in response to verifying that all the system-level combinations in the subset are specified as valid.