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Drift tracking feedback for communication channels

  • US 7,640,448 B2
  • Filed: 05/03/2007
  • Issued: 12/29/2009
  • Est. Priority Date: 03/17/2004
  • Status: Active Grant
First Claim
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1. A method for calibrating a system including a memory controller, a memory device, a first link coupling the memory controller and the memory device and a second link coupled to at least the memory controller, comprising:

  • establishing an operation value of a parameter affecting operation of the first link using a first calibration sequence, wherein the first calibration sequence comprises transmitting data patterns from the memory controller to the memory device via the first link;

    operating the first link using the operation value for communication of data;

    monitoring drift of a signal on the second link during said operation of the first link, the signal having a characteristic which drifts by amounts that correlate with drift of the parameter, and providing a drift value; and

    adjusting the operation value of the parameter based on the drift value.

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