公开(公告)号：US20220303036A1

公开(公告)日：2022-09-22

申请号：US17619611

申请日：2020-06-18

Applicant: CISCO TECHNOLOGY, INC

Inventor： Matthew Chapman ,  Ka-Shu Wong

IPC: H04J3/06

Abstract: Disclosed is a method of determining time in a digital processing system, comprising, in a present cycle of a first digital clock: accessing a reference time counter for a reference digital clock, wherein the reference time counter increments in value by a fixed amount at every cycle of the reference digital clock, the reference digital clock being of a higher accuracy than the first digital clock; accessing a first time counter for the first digital clock, wherein the first time counter increments in value by an updatable increment amount at each cycle of the first digital clock; and comparing at least one part of the reference time counter with at least one corresponding part of the first time counter. Based on the comparing, an adjustment is made to one or more attributes of the first time counter, so that first time counter at least approximates the reference time counter.

公开(公告)号：US11804921B2

公开(公告)日：2023-10-31

申请号：US17619611

申请日：2020-06-18

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Matthew Chapman ,  Ka-Shu Wong

IPC: H04J3/06

CPC classification number: H04J3/0685

Abstract: Disclosed is a method of determining time in a digital processing system, comprising, in a present cycle of a first digital clock: accessing a reference time counter for a reference digital clock, wherein the reference time counter increments in value by a fixed amount at every cycle of the reference digital clock, the reference digital clock being of a higher accuracy than the first digital clock; accessing a first time counter for the first digital clock, wherein the first time counter increments in value by an updatable increment amount at each cycle of the first digital clock; and comparing at least one part of the reference time counter with at least one corresponding part of the first time counter. Based on the comparing, an adjustment is made to one or more attributes of the first time counter, so that first time counter at least approximates the reference time counter.