That sounds nasty. I've had my share of problem with Atmel parts though when operating at high rates - on their Cortex-M3 and SAM9 there were problems of AHB ov

That sounds nasty. I've had my share of problem with Atmel parts though when operating at high rates - on their Cortex-M3 and SAM9 there were problems of AHB overruns and data loss when doing fast Ethernet or SPI transfers. No hard lockups though.