Re: FPGA for PCI based servo control board
- Subject: Re: FPGA for PCI based servo control board
- From: Jon Elson <elson-at-pico-systems.com>
- Date: Tue, 01 Apr 2003 00:45:23 -0600
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- Organization: Pico Systems
- References: <200303312225.RAA12099-at-webmail11.cac.psu.edu>
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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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