Supporting calibration for sub-rate operation in clocked memory systems
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United States of America Patent
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May 24, 2016
Grant Date -
Oct 29, 2015
app pub date -
Apr 15, 2015
filing date -
May 6, 2011
priority date (Note) -
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Abstract
The disclosed embodiments related to a clocked memory system which performs a calibration operation at a full-rate frequency to determine a full-rate calibration state that specifies a delay between a clock signal and a corresponding data signal in the clocked memory system. Next, the clocked memory system uses the full-rate calibration state to calculate a sub-rate calibration state, which is associated with a sub-rate frequency (e.g., ½, ¼ or ⅛ of the full-rate frequency). The system then uses this sub-rate calibration state when the clocked memory system is operating at the sub-rate frequency. This calculation of the sub-rate state calibration states eliminates the need to perform an additional time-consuming calibration operation for each sub-rate.
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