I created a one pin planning project in the PlanAhead tool by importing the UCF file, but DRC reports the following error:
I/O port my_port_p is Single-Ended but has an IOStandard of DIFF_SSTL_18_II which can only support Differential
The I/O port is intended for differential.
How can I resolve this error?
PlanAhead 14.1 and earlier tool versions were not able to infer a differential pair based on signal names with _p and _n suffixes. This required the user to manually define them as a differential pair.
To define a differential pin pair, select the desired two I/O ports, and select the Make Diff Pair pop-up menu command in the I/O Ports view.
In PlanAhead 14.2 and later tool versions, the tool infers differential ports based on the following rules: