I have a project based on and Arria 10 SoC development board which using FMC ports (LVDS IO Standard). I have a bidrectional pin which is the "io" port in an alt_iobuf instance.
The project synthesizes fully, but fails on the fitting, giving the error " can't on open-drain option for differential io pin".
I have looked up the solution and everywhere says to enable differential mode on the IO buffer, but nowhere says how to enable it?. Here is the current instance:
alt_iobuf IOBUFF_scl (
.i(1'b0),
.oe(scl_oen),
.io(scl), //bidirectional pin
.o(scl_c_normal)
);
How do you enable differential mode?
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