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METHOD FOR ROBUST PREAMBLE LOCATION IN A DQS SIGNAL

  • US 20130208553A1
  • Filed: 02/10/2012
  • Published: 08/15/2013
  • Est. Priority Date: 02/10/2012
  • Status: Active Grant
First Claim
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1. A method for capturing a Data Lane Signal (DQ) by determining a preamble location in a Data Strobe Signal (DQS), comprising:

  • using a computer device or processor to perform the steps of;

    receiving a maximum delay value and a step size;

    sampling said DQS at said maximum delay value;

    sampling said DQS in a sequence of delay values, a greatest delay value in said sequence of delay values being one step size less than said maximum delay value, each delay value of said sequence of delay values being one step size less than a proximal delay value, said sequence of delay values beginning with said greatest delay value;

    storing at least one delay value when said sampling indicates said DQS was at a high;

    storing at least one delay value when said sampling indicates said DQS was at a low;

    storing at least one delay value when said sampling indicates said DQS made a transition from said high to said low;

    determining and storing an earliest location of said transition from said high to said low;

    storing a preamble location and discontinuing said sampling when, during a single clock cycle, said sampling indicates a number of consecutive instances of said DQS being at said low, said number of consecutive instances based on a multiple of said step size; and

    capturing a DQ based on said stored preamble location and said earliest location of said transition from said high to said low.

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