Nios Development kit

Thanks BadOmen.

I've already did so, my problem was not to design the counter, for this I don't have problems! And now that I found "the secret pin"!!, there are no problems anymore. As I say in the other topic called "programming .sof file with nios dev kit stratix", the problem was coming from a pin, which might be used for PLD reconfiguration. For Ep1S10 device, it is the pin U2 called in examples "PLD_RECONFIGREQ_N", and this pin must be set at VCC in order it doesn't command a reconfig after the end of loading a program. I don't know if I undestood it correctly, but all I know is that now, it works fine with this. I had tried setting unused pins to tristate, but I didn't get a better result than before. I find strange it works for you and not for me! There may be some black magic in the air!!

Thanks for your help