Help needed for AX88796 drivers

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Im trying to develop as small embedded system with a 32bit
microcontroller and other peripherals an a fpga. I would like to add a
little webserver to the system, but I have a problem with basic setup.
The ax88796 drives the interrupt of the microcontroller and the
ethernet packets are transferred in the system ram. It appears
sometimes that the AX88796 does not receive the packet and does not
generate the interrupt, altough i sent a packet to it. I know this
because the system does nothing else as responding to arp and icmp
requests
(the routines are taken from asix and national references) and
sometimes ping request are not received, altough im sure that theyve
been sent from the pc (thanks to ethereal packet sniffer).

Any ideas, known bugs, etc?

thanks

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