The choice of configuration voltage must be communicated to the Vivado tools by setting the CONFIG_VOLTAGE and/or CFGBVS properties. In addition, the CONFIG_MODE property can be defined so that the tools recognize which configuration pins are used. The Vivado tools provide errors if there are any conflicts between configuration pin settings, such as an IOSTANDARD on a multi-function configuration pin that conflicts with the configuration voltage. These properties can be set in the Vivado configuration dialog (Edit Device Properties), or through Tcl commands. See Vivado Design Suite Properties Reference Guide (UG912) for details on the Tcl syntax. See Vivado Design Suite User Guide: I/O and Clock Planning (UG899) for examples of how Vivado tools use these options.