When I create a PlanAhead Project with ISE Placement and Timing Results, I added a top synthesized netlist as well as adding a directory where submodule netlists reside.
However, I received anerror indicating modules not found. Why?
By default, the tool does not automaticallyadd files from all subdirectories of any directories specified using the Add Directories... option.
Say you place an a.ngc file under \netlist\a and ab.ngc under \netlist\b separately. You need to specify these two directories instead of just adding the \netlist directory.
You can override this behavior by changing PlanAhead options.
In 13.1, this option is ON by default.