Interfacing Spartan3 FPGA to 5V PCI

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Hi,
is setting the Vcco of Spartan3 banks to +3.3V would allow the FPGA to
work with a 5V signaling environment like 5V PCI? Or there are some
other means to do this?

Thanks.


Re: Interfacing Spartan3 FPGA to 5V PCI
Hi,
Look in Virtex-II user guide, "5V Tolerance in Virtex-II Devices", page
209. I think the same will apply to Spartan3 IO

Cheers
Sudhir


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Re: Interfacing Spartan3 FPGA to 5V PCI
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Hi,
I tried to search for the document that you're referring but i cant
find it, do you have the reference no. of the document?
I have read some other document:
http://www.xilinx.com/products/virtex/techtopic/vtt002.pdf
which tells it is needed to have an external resistor for 5V
signalling.
BTW, what does that document says about 5V signalling?

Thanks.


Re: Interfacing Spartan3 FPGA to 5V PCI
Hi
You can find the document at this link
http://direct.xilinx.com/bvdocs/userguides/ug002.pdf
Page 209

You need to put an appropriate series resistor to limit the amount the
current that flows through the clamp diodes.

Hope this helps
Cheers
Sudhir

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