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Communication channel calibration using feedback

  • US 9,172,521 B2
  • Filed: 02/17/2012
  • Issued: 10/27/2015
  • Est. Priority Date: 06/09/2004
  • Status: Active Grant
First Claim
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1. An integrated circuit chip, comprising:

  • an interface circuit including a receiver configured to receive data signals from a wired link, the data signals carrying a sequence of data symbols, and to sense data values represented by the data symbols;

    continuous calibration circuitry includinga sensor coupled with the interface circuit, which senses phase of the data signals received at the interface circuit;

    logic, coupled with the sensor, which stores timing drift information about the phase; and

    a transmitter, to transmit the stored timing drift information to a source of the data signals.

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