LVDS interconnect

Hi all

I designed a board, There are two FPGAs, One is ep1agx50 , anothers is ep2s130. About 6 months ago, I can transmit data form ep2s130 to ep1agx50 through LVDS, But now, The ep1agx50 can't receive any correct data. I checked the schematic, and found that ep2s130 PLL－ENA pin left float, Is it reason?

Thanks forward.