Dear Arnaud
I noticed a weird problem on FMC112.
I'm using chipscope to verify the signals in my design. I apply a pulse signal (with 800mV-pp, for example) to one of the channels, and verify the chipscope data, I notice that sometime the internal signal (output of fmc stellar) is getting saturated and tolerates between 8191 to -8192.
I'm using fmc112 stellar IP as you provided without any change. Do you have any idea, what might be the problem?