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Problem about boot



hello:

  I made a PCB board, the FLash is empty, I want to boot it from ethernet, but when powered on, the TXEN pin of ETRAX 100LX can not output 25M clk signal. 
  I have checked the external component of PLL carefully, and the input CLK is OK.
  What can I do?
  What conditions must be meet when 25MHz signal can be outputed?