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Intel: On Cyclone® IV, if I/O Standard is set to Differential HSTL-18 and a pin is tri-stated, Fitting will fail.

<Error message>
Error (176202): The differential I/O standard <name> cannot be used on the pin <name>, because the specified pin uses a tri-stated output buffer.

Category: Specifications
Tools: Quartus® Prime
Device: Cyclone® IV


Cyclone® IV differential pins do not allow tristate.
Implement tri-state by preparing p-side and n-side with HSTL-18 instead of Differential HSTL-18.


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