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您好：
DDR的问题，参考这个：
http://www.deyisupport.com/question_answer/dsp_arm/davinci_digital_media_processors/f/39/t/22026.aspx
电源的问题，建议第一版预留用个磁珠或者电阻隔开，方便做实验。很多客户的板子都很小，他们layout都做成功了的。
