Timing recovery in data communication circuits
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United States of America Patent
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Apr 14, 2009
Grant Date -
Feb 6, 2003
app pub date -
Jul 31, 2002
filing date -
Aug 2, 2001
priority date (Note) -
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Abstract
In a 1000 BASE-T transceiver, a timing error detector (TED, 5) receives its inputs directly from the output of an ADC (2) and from a decision device (4). Timing recovery is acquired in three stages: a non-decision directed (NDD) stage during which only the output of an ADC (2) are used for acquisition; a stage for acquiring the remote scrambler and predicting symbols; and a decision-directed (DD) stage during which locally predicted symbols are also used for acquisition. Because the timing error detector (TED, 5) does not take inputs from the FFE (3) there is no information about cable length, and so an input of gain from an AGC is used to indicate cable length.
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