Frequency-locking device and frequency-locking method thereof
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United States of America Patent
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Jan 11, 2011
Grant Date -
May 29, 2008
app pub date -
Oct 23, 2007
filing date -
Nov 24, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention proposes a simple method suitable for automatically locking frequency during USB data communication. Based on the soft plug/unplug concept proposed in the contents and the error handling mechanism defined in the USB specification, we can calibrate the clock frequency of the digitally controlled oscillator (DCO), through the token packets, to be within the acceptable frequency when USB device is attached to the host controller.
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