09-03-2019 10:38 PM
I used a STARTUPE2 primitive in project. I opened the IMPLEMENTED DESIGN, why it generated STATRUPE2_inst_i_1 which is LUT cell (just as pic.1), while sometime, it just has only one cell (pic.2).
09-03-2019 10:52 PM
Click on the STARTUPE2_inst_i_1(LUT5) cell and press F4 to see the schematic for its connections. I believe the implementation must be inserting the LUT cell during optimization. The information will be present in the log file.
The pic2 without LUT5 must be from synthesized design.
09-03-2019 11:33 PM - edited 09-03-2019 11:35 PM
If pic2 is from implemented design then can you confirm pic1 is from synthesized design which has LUT5 cell?
Can you add -verbose switch under more options for opt_design and place_design in implementation settings as shown below. Rerun implementation and share the runme.log file which will be present in your project.runs folder:
Example <project>/<project>.runs/impl_1/runme.log file.