Re: FPGA for PCI based servo control board





ERIC KELLER wrote:

>I looked at a lot of fpgas to use for PCI interfacing.  I came down to the
>notion that only the Xilinx Spartan II made sense.
>The Spartan II has 3.3 and 5 v i/o, and thus is 5v pci compatible.
>
That is NOT true 5 V I/O.  It is 5V TOLERANT I/O.  If you want to pull 
up above
3 V, you need low-value pull-up resistors external to the chip.  If you 
need really fast
positive-going transitions to +5 V, you can't get them.

Jon




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