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现在设计的方案，USB在高速通讯下会断线。
同时，个别板需将USB模块关闭，否则系统都无法启动。
不知问题会出在哪，都没有招啦！
用CCS测试一下USB模块，特别是USB的电源
http://support.spectrumdigital.com/boards/evmdm365/revf/
