The MIG Spartan-6 FPGA MCB design includes a Continuous DQS Tuning circuit. This circuit ensures proper read data capture across voltage/temperature shift by adjusting DQS internally. Continuous DQS Tuning is enabled in all MIG v3.3 MCB designs. For detailed information on Continuous DQS Tuning, please see the MCB Operation > Calibration section of the Spartan-6 FPGA Memory Controller User Guide (
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