In the UltraScale and UltraScale+ device XPE spreadsheets, the block RAM sheet has additional column named Cascade Group Size. For cascaded block RAMs, this column shows how many block RAMs are cascaded together in each group. This number and the total number of block RAMs in the modules are used to determine the number of active block RAMs at a given time.
For example, if the module has a total of 20 block RAMs and the Cascade Group Size is 4, the tool calculates 20/4=5 groups each with 4 block RAMs cascaded together. If none of the block RAMs are cascaded, leave this column empty or set to 0.