LVDS_TX no output

I tried with and without the external PLL, same result.

SignalTap show me all the signal correctly (also the other clock from the PLL), all exept the signals going out of the LVDS_TX.

I also tried with the megafunction DDIO.

The LVDS pin should be ok as I have Dataclkp/n and framep/n generated by a PLL. (read with a external oscilloscope).

And if I put the output of a fifo on the 8 pin of the LVDS, I have something.

I should miss something with this LVDS_TX.