Invention Grant
- Patent Title: Timebase synchronization
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Application No.: US15831732Application Date: 2017-12-05
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Publication No.: US10048720B2Publication Date: 2018-08-14
- Inventor: Shu-Yi Yu , Erik P. Machnicki , Gilbert H. Herbeck , Kiran B. Kattel , Manu Gulati
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Agent Lawrence J. Merkel
- Main IPC: G06F1/12
- IPC: G06F1/12

Abstract:
In an embodiment, an integrated circuit such as an SOC (or even a discrete chip system) includes one or more local timebases in various locations. The timebases may be incremented based on a high frequency local clock that may be subject to variation during use due. Periodically, based on a lower frequency clock that is subject to less variation, the local timebases may be synchronized to the correct time, using hardware circuitry. In particular, the correct timebase value for the next synchronization may be transmitted to each local timebase, and the control circuit for the local timebase may be configured to saturate the local timebase at the correct value if the local timebase reaches the correct value before the synchronization occurs. Similarly, if the synchronization occurs and the local timebase has not reached the correct value, the control circuit may be configured to load the correct timebase value.
Public/Granted literature
- US20180107240A1 Timebase Synchronization Public/Granted day:2018-04-19
Information query