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6678 emac flow control

hi,every one.

 I'm using 6678 evm,and use it's GbE subsystem to communicate with pc through ethernet .Everything goes well at the begin,but dsp 6678 send pause frame(the opcode is 1,and the pause_time is 0)again and again without end as time goes,then dsp cann't receive any packet from pc.what is then problem?what should i do to solve with flow control on.Thans!