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Method and apparatus for generation of a system master timebase of a computing device using indirect signalling of timing information

  • US 8,724,615 B1
  • Filed: 06/12/2006
  • Issued: 05/13/2014
  • Est. Priority Date: 10/11/2005
  • Status: Active Grant
First Claim
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1. A method of creation of a system master timer, wherein the system master timer is usable to provide a system time reference for a plurality of network devices, the method comprising:

  • creating the system master timer based on a timer interrupt and a high-resolution timer having a resolution greater than a timer interrupt resolution, resulting in the system master timer having a higher resolution than a timer interrupt resolution,determining a first value of the high-resolution timer at the start of a synchronization event that is triggered by the timer interrupt;

    determining a second value of the high-resolution timer, the second value being the receipt time when a master device receives a signal with timing information from a slave device;

    determining an elapsed time for a number of periods of the timer interrupt; and

    calculating an adjustment of the system master timer from the elapsed time and the difference between the first value and the second value,wherein the system master timer is a persistent timer, wherein a persistent timer is a timer that persists over a plurality of synchronization events.

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