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C6678 DDR3初始化不通过



您好:
使用的是自己的板卡,DDR3参考时钟为66.67MHz。使用KeyStone_DDR_init()对其进行初始化。参数写为KeyStone_DDR_init(100,13,1)可以通过初始化。如果参数写为KeyStone_DDR_init(66.67,13,1)就不能通过初始化。
显示为:
Memory pattern filling Test fails at 0x80000000, Write 0x 0, Readback 0x a0000f7000000
Memory pattern filling Test fails at 0x80000008, Write 0x 0, Readback 0x f50000ef000000
Memory pattern filling Test fails at 0x80000010, Write 0x 0, Readback 0x ff0000df000000

经过示波器测试晶振输出为66.67MHz没有错误。不知道这是什么原因。C6678_EVM_DDR_Init()中的对DDR3_CONFIG_REG的赋值没有改变。是不是应该重新计算?
谢谢