Internal Error: Sub-system: ASMDB, File: /quartus/db/asmdb/asmdb_param.cpp, Line: 522 iter != m_enum_map-&gt - Internal Error: Sub-system: ASMDB, File: /quartus/db/asmdb/asmdb_param.cpp, Line: 522 iter != m_enum_map-&gt Description For designs that target an Arria V, Cyclone V, or Stratix V device, if you create an I/O node with and ECO change in the Chip Planner, a subsequent Check and Save All Netlist Changes operation fails with the error Internal Error: Sub-system: ASMDB, File: /quartus/db/asmdb/asmdb_param.cpp, Line: 522 iter != m_enum_map-&gt Resolution For affected device families, I/O node creation with ECOs is not supported by the Quartus II software version 12.0. This issue is corrected in the Quartus II software version 12.0 SP1. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.0.1 12.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']