Redundant clock switchover
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United States of America Patent
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Jul 19, 2016
Grant Date -
Aug 13, 2015
app pub date -
May 7, 2014
filing date -
Feb 10, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Aspects of this disclosure relate to reference switchover. In one embodiment, an apparatus includes a phase error detector, a phase alignment detector, and a selection circuit. The phase error detector is configured to generate an indication of a relative phase difference between a first reference clock signal and a second reference clock signal. The phase alignment detector is configured to receive the indication of the relative phase difference and determine when the relative phase difference satisfies a preset threshold. The selection circuit is configured to transition from providing the first reference clock signal as a clock system reference signal to providing the second reference clock signal as the clock system reference signal responsive to the phase alignment detector detecting that the relative phase difference satisfies the preset threshold.
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