Method and apparatus for delay line control using receive data
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United States of America Patent
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Jul 15, 2008
Grant Date -
Apr 5, 2007
app pub date -
Sep 30, 2005
filing date -
Sep 30, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatus are provided for delay line control using receive data. A delay in a Delay-Locked-Loop circuit is controlled by obtaining a plurality of samples of one or more received signals for each unit interval; determining a data eye width in the one or more received signals; and adjusting a delay of at least one clock signal based on the data eye width. For example, the measured data eye width can be compared to a predefined value, such as a desired or ideal value. Generally, the delay is not adjusted in accordance with the present invention until the Delay-Locked-Loop circuit has reached a locked condition based on one or more predefined criteria.
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