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6674的sysclkout和usb-jtag的问题

我设计了一个板子,基本基于6678  evm开发板,现在上电后发现sysclkout输出不正常,为330mhz左右,而核时钟100mhz,而且jtag也连不上,是什么原因呢,求求各位大神了