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6455读写ddr2错误

我在一块板子上有两块dsp6455分别挂了两个ddr2,其中dspa的ddr2读写都正常,而dspb的ddr2读写不正常,读出来的数据是乱的。两片dsp的原理图一模一样,pcb也几乎是一样的。这种板子总共生产了6套,每套的情况都一样(dspa的ddr2正常而dspb的ddr2不正常)。求指导是哪里出错了,应该怎么查问题。