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Old 12-03-2007, 11:36 AM
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Default Re: Interfacing Cyclone III to 3.3v LVDS devices

[email protected] wrote:
> How can i interface the cyclone III with 2.5v LVDS to 3.3v LVDS adc &
> dac ?
> Thanks

If you set 3.3v to a i/o block and Quartus does not allow you to
assign LVDS on a pin of that block (w/ an error message when fitting)
tell quartus you have 2.5v (despite you will use 3.3v in your board)
It will pass compilation and will work great.
I had that issue on CycloneII driving clocks to ADCs from Analog
devices, I'll bet will be the same on CyIII.

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