[Open-graphics] XP10 and 5V input compatibility

[Timothy Normand Miller]

There are a couple of things relevant to your question:

On page 2 of the schematic, top left, you should see a set or series
current-limiting resistors connecting PCI to the XP10.

Page 144 of the XP handbook discusses PCI and 5V tolerance.


On 5/2/07, Attila Kinali <attila at kinali.ch> wrote:
> Hi,
>
> I just had to evaluate some FPGAs for work to be used
> as PCI interfaces in a mixed 3.3V/5V enviroment. Because
> there are very few FPGAs that can tolerate 5V at their
> input while running at 3.3V i checked out how OGD1 is doing
> it, just to realize that the XP10 (resp XP6 in the old schematics)
> does not tolerate 5V inputs according to the datasheet (unless i
> missed something).
>
> As the revision G of the schematics of OGD1 do not contain
> any interface logic between the XP6 and the PCI bus, it
> raises the question how the XP6 is made 5V tolerant.
> Or is the assumption that all PCs out there use 3.3V only
> these days?
>
>                         Attila Kinali
>
> PS: does anyone know a cheap EEPROM based FPGA that is 5V tolerant?
>
> --
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-- 
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project