Error Can Occur When Using Multiple EMIFs in a Single Column and Sharing RZQ Pins - Error Can Occur When Using Multiple EMIFs in a Single Column and Sharing RZQ Pins Description If you are using multiple external memory interfaces in a single column, you might encounter the following error message when sharing RZQ pins: Error: Internal Error: Sub-system: AMM, Fkile: /quartus/db/amm/amm_atom_mod_util_impl.cpp, Line: 4623 Cannot merge atoms - incompatible sources. Resolution The workaround for this problem is to modify an RTL file deployed by the EMIF IP. Proceed as follows: Open all instances of the file altera_emif_arch_nf_oct.sv . Locate the instantiation of twentynm_termination_logic . Comment out or delete the line that connects the port s2pload of this module to the signal oct_s2pload . Recompile your design. You should use a separate RZQ resistor for each external memory interface going forward, because doing so will improve the accuracy of calibrated termination settings. This problem will be fixed in a future version. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 16.0 ['Arria® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']