公开(公告)号：US11683149B2

公开(公告)日：2023-06-20

申请号：US17472242

申请日：2021-09-10

Applicant: Apple Inc.

Inventor： Christopher D. Finan ,  Alexander Ukanwa ,  Charles F. Dominguez ,  Jean-Didier Allegrucci ,  Jeffrey J. Irwin ,  Kalpana Bansal ,  Michael Bekerman ,  Remi Clavel

IPC: G06F1/12 ,  H04L7/00

CPC classification number: H04L7/0016 ,  G06F1/12 ,  H04L7/0008

Abstract: A method and apparatus for synchronizing a timebase is disclosed. A timebase management circuit includes limit circuitry, in a first clock domain, which generates, based on a global timebase, an initial timebase limit. The timebase management circuit includes, in a second clock domain, adjustment circuitry that generates an adjusted timebase limit based on the initial timebase limit. A storage circuit in the second clock domain stores a local timebase. Update circuitry, coupled to an output of the storage circuit, generates an updated local timebase using a clock signal in the second clock domain, wherein the updated local timebase is subject to the adjusted timebase limit.