Clock and data recovery circuitry with auto-speed negotiation and other possible features
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United States of America Patent
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Sep 9, 2014
Grant Date -
Apr 18, 2013
app pub date -
Dec 4, 2012
filing date -
Feb 4, 2010
priority date (Note) -
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Abstract
An integrated circuit (“IC”) may include clock and data recovery (“CDR”) circuitry for recovering data information from an input serial data signal. The CDR circuitry may include a reference clock loop and a data loop. A retimed (recovered) data signal output by the CDR circuitry is monitored by other control circuitry on the IC for a communication change request contained in that signal. Responsive to such a request, the control circuitry can change an operating parameter of the CDR circuitry (e.g., a frequency division factor used in either of the above-mentioned loops). This can help the IC support communication protocols that employ auto-speed negotiation.
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