Quartus

HSDI input or output pin <name> assigned to use <name> I/O standard, but must use differential I/O standard -- using LVDS I/O standard

CAUSE: You assigned the specified I/O standard to the specified HSDI transmitter or receiver input or output pin, but the specified I/O standard is not a differential I/O standard. As a result, the Fitter used the LVDS I/O standard for the pin by default. You must assign only the LVDS, LVPECL, or 3.3-V PCML I/O standard to an HSDI transmitter or receiver input or output pin.
ACTION: Delete the assignment, or change the assignment to the LVDS, LVPECL, or 3.3-V PCML I/O standard for the pin.

See also:

Assigning I/O Standards to Pins
Changing Assignments
Deleting Assignments in the Assignment Organizer Dialog Box
Overview: Making Assignments

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