Quartus

Can't pack non-peripheral register <name> to bidir I/O pin <name> -- output register and TRI or OPNDRN primitives cannot both fan-out


CAUSE: You turned on the Fast Output Register or the Fast Input Register options for the specified register. However, the Fitter cannot assign the register to the bidir I/O cell for the target device you specified for the current design because the I/O cell does not have two output ports.
ACTION: Turn off the Fast Output Register or Fast Input Register option for the specified register or specify a device that has two output ports in its I/O cell.

See also:

Assigning Options for Individual Nodes & Entities
Overview: Making Assignments
Specifying the Device Family & Device for Compilation

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