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ZQ CALIBRATION CONTROLLER AND METHOD FOR ZQ CALIBRATION

  • US 20080219068A1
  • Filed: 12/31/2007
  • Published: 09/11/2008
  • Est. Priority Date: 03/08/2007
  • Status: Active Grant
First Claim
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1. A ZQ calibration controller of a semiconductor memory device, comprising:

  • a first signal generator for generating a pre-calibration signal during an initialization of the semiconductor memory device;

    a second signal generator for generating ZQ calibration signals in response to a ZQ calibration command; and

    a control unit for outputting signals to control a ZQ calibration in response to the pre-calibration signal and the ZQ calibration signals.

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