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Thank you for pointing that out. Indeed that means that I don't need voltage translator. My signals are going to be "well-behaved". I think that in this case a voltage translator might do more damage then good. For example it can limit the signals frequency or cause some kind of signal integrity problem. I just need to check that the other side can use 2.5V instead of 3.3V though I'm pretty sure it will be fine.
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If you don't use a buffer, then still try to be conservative; add series resistors on each of the signals that go between your board and the FPGA. Stuff them with a low-value (eg., 0-ohms or 10-ohms). You can use these as source terminations on signals configured to drive from your board over to the FPGA board. That'll eliminate ringing/overshoot.
Cheers,
Dave
Honored Contributor
