To change implementation options for NGDBuild, MAP, Post MAP TRACE, PAR, and Post PAR TRACE, go to the System tab in XPS.
Under "Project Files" you will see "Implementation Options File: etc\fast_runtime.opt".
Open this file and insert the additional option in the desired section.
By default, the implementation option settings for the MAP section look similar to the following:
To add a CLB packing factor of "5" during the MAP stage for example, modify the above section as follows:
For incremental designs, add the guide file switch "-gf system.ncd" in the PAR section of the implementations options file as described above.