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Direct interfacing should be fine.
Check the data sheet of the device the FPGA interfaces to and see what its input high minimum is. If its less than 3.5V, then you don't need to worry. If it is higher than 3.5V, then you might need to do a little more testing. For example, actually drive the device with an FPGA output and measure the voltage. Worst-case if the device does not recognize 3.5V as a logic high, you would then need to add a pull-up, but you would also have to change your FPGA logic to drive-high and then tri-state (you want to drive high first so that the output gets to 3.5V fast).
Cheers,
Dave
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Yeah, that's what I figured. VIH is listed as 2.2v min which should give it plenty of margin. Thanks for the quick reply Dave!
-Mux
Honored Contributor
