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pci express core lnk_up deasserted

Observer
Posts: 46
Registered: ‎08-26-2013

pci express core lnk_up deasserted

when I use pci express core for endpoint mode,after power up,the core initial successful with GEN2_X4,and the lnk_up_n signal asserted ,but some time later,the lnk_up_n deasserted,and then,link_up_n asserted again,but base adderss register loss, if host send a read request after this ,return value from endpoint are all "ffff",do someone know why this occur?

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Observer
Posts: 46
Registered: ‎08-26-2013

Re: pci express core lnk_up deasserted

who can help me ?thanks