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ddr数据读取出错



求助,板子是8148,自己做的,参考的evm8148,采用4片16位ddr3,在CCS调ddr测试程序,时钟频率跑到300M,查看内存发现经常出现读取出错,经常高半字的16位读取出现0000,从新刷新一下,数据又会恢复正常,如下图重新刷新数据会恢复正常,但是别的地址又会出现新的错误,而且都是高16位出现0000