Problem Microtronix Board - Ethernet MAC

Hello,

I have a Microtronix Cyclone (1C20) DevBoard. I use in my Design the SDRAM.

I can build an example application (Hello_World or Hello_Led).

I can download and bebug the example applications. -> All Ok.

Then, I have add the OpenCores Ethernet MAC in my SOPC Design.

At this time my example applications did not run.

When I want debug, then I see "Thread is running. When I stop the Debugger then

I have two cases. One case is a communication error. In the other case the

Debugger is stop in the "alt_irq_entry".

Can anyone help me

Thank you