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1. HPC should handle multi-rank. You have to first tell it how many overall chip selects, then tell it how many of them are for multiple ranks.
2. You may not be completing calibration. Seems like when you disable the calibration, you see your data, but then the data is likely not properly calibrated to dqs. There is a signal that comes out of the controller called init_done. You can check to see if that is going high or staying low.
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Ok, I see, thanks for you reply! You are right, the calibration was not done correctly.
Problem has been solved. It is caused by the power supply of I/O voltage in the FPGA Board, during the initialization the current of the 1.8V is very high, so even the initial_done was going high(spending several seconds), but the 1.8V supply is abnormal during the initialization. So I increased the capacity of the 1.8V driving.
Thanks again!
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