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Linear system for link training

  • US 8,681,848 B2
  • Filed: 10/28/2011
  • Issued: 03/25/2014
  • Est. Priority Date: 10/28/2011
  • Status: Active Grant
First Claim
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1. An apparatus for equalizing a plurality of channels that is generally transparent to link training, the apparatus comprising:

  • a plurality of equalization paths formed by an input circuit, a crossbar, and an output circuit, wherein each equalization path is coupled to at least one of the channels and wherein the crossbar is connected between the input circuit and the output circuit; and

    a controller having;

    a gain control loop that receives a first reference voltage and that provides a gain control signal to the input circuit, wherein the gain control loop includes a replica of at least one of the equalization paths;

    a crossbar loop that receives a second reference voltage and that provides a crossbar control signal to the crossbar; and

    a driver loop that receives a third reference voltage and that provides a driver control signal for the output circuit.

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