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Zybo board 1.8V logic



I have a quick question.  I am trying to interface my Zybo board with a camera module (Arducam OV5640).  The datasheet says that it uses 1.8/2.8V logic.  In my XDC file do I simply use IOSTANDARD LVCMOS18 for each pin?  I have tried this using the pmod connectors on the Zybo board and setting one pin high but when I check the voltage with a multimeter it reads 3.3V.

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