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Periodic calibration for communication channels by drift tracking

  • US 8,644,419 B2
  • Filed: 04/20/2012
  • Issued: 02/04/2014
  • Est. Priority Date: 01/28/2004
  • Status: Active Grant
First Claim
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1. In a memory system, in which a memory controller and a memory device communicate data across a channel, and in which channel timing is periodically calibrated, a method comprising:

  • performing, using at least one of the memory controller and the memory device, a first calibration operation associated with communication across the channel to identify an initial value for a data eye timing point;

    periodically performing, using at least one of the memory controller and the memory device, drift tracking using a second calibration operation, including identifying drift associated with the data eye timing point location; and

    in response to drift tracking, updating the data eye timing point, and communicating data across the channel using the data eye timing point as updated.

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