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Dm8168 DDR问题

大家好,我在设计Dm8168时发现SDI公司的Demo原理图”evm816x_Orcad_RevG.DSN“的SH21 - EMIF DDR0 BANK0页 DDR控制器的数据线D0-D7,D8-D15,D16,D17-D23,D24-D31与4片8位的DDR芯片D0-D8不是完全对应的,请问题这是怎么回事?谢谢大家!详见图片。