On a Virtex4FX, if the Vccint was run at 2.5V instead of 1.2v, what problems would someone expect? And after what period of time? For example, if it was over-voltage for 2 minutes, the GT's would be waste but the PowerPC may be partially functional.
Ouch!
It is likely that ALL the junctions and gate oxides might fry at 2.5 volts (massive short) on the 1.2 volt supply!
If anything at all works, you are very very lucky.
I would not ship this part to anyone if it still works, as it may subsequently fail at any moment due to the extreme stress you put it through.
Ouch!
Austin
Look at the datasheet. There is usally a section with maximum and minimum voltages. There is also an absolute maximum and minimum voltage range. This section generally comes with a warning saying something like violating this will cause damage. You *may* get away with running the device up to the absolute maximum for short periods of time. This is highly risky and will probably destroy the device and the other active devices on the PCB.
Why do you want to do this?
orphiend wrote:
Why does someone want to crash their car? It's quite apparent this was an accident.
It was an "accident" in that the 1.2v supply/regulator was wrong and was generating 2.5v instead. Hence the question. :)
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