Warning: Some pins have incomplete I/O assignments. Refer to the I/O Assignment Warnings report for details
Warning: Found invalid Fitter assignments. See the Ignored Assignments panel in the Fitter Compilation Report for more information.
Warning: 2 pins must meet Altera requirements for 3.3-, 3.0-, and 2.5-V interfaces. For more information, refer to AN 447: Interfacing Cyclone IV E Devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O Systems.
Warning: Skipped module PowerPlay Power Analyzer due to the assignment FLOW_ENABLE_POWER_ANALYZER
谁能告诉我这些警告是什么问题 万分感激