Nios interrutions

Hello,

I use quartus II 4.00 and SOPC builder 4.00 to build a NIOS system on a Stratix II board.

I enabled the support for external interruptions, add a user defined IP connected via the provided avalon ahb bridge.

Everything is ok.

Then I try to use the interruption of the bridge, everything on the wire is ok until the data_master_irq gets high. The iq number is ok, NIOS makes a couple of instructions more and then stops on a strange adress (totallly out of the memory map). but it doesn't fetch the ISR code indeed.

The soft uses nr-installusr and is exactly the same as the examples provided.

I tried whithout any soft isr and initialisation to see if i get the famous message ... but nothing.

How can I be sure of what is done by the compiler, is there any restriction that I don't respect ? thanks for all your help and experience about those interrupts on NIOS systems.

Sincerely

Julien Chevalier