The Physical interface of the MIG Spartan-6 MCB controls the initialization sequence and calibration.
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The PHY converts the controller instructions into the actual timing relationships and DDR signaling necessary to communicate with the memory device. The PHY also deals with calibration optimal performance and reliability.
For more information on the PHY architecture, pleasesee the following Design Assistant Answer Records:
(Xilinx Answer 43630) - PHY Calibration Steps
(Xilinx Answer 43673) - PHY Signals and Parameter Description
(Xilinx Answer 43671) - Standalone PHY Support