cyclone v 调试DDR3L时出现SEQ.C: CALIBRATION FAILED

板子使用的DDR3是MT41K256M16TW-107AATP。根据手册设置完时序参数后,运行时出现: SEQ.C: CALIBRATION FAILED SEQ.C: Calibration Summary SEQ.C: Calibration Failed SEQ.C: Error Stage   : 1 - VFIFO SEQ.C: Error Substage: 1 - GUARANTEE
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