Timing Not Met in Cyclone III Devices - Timing Not Met in Cyclone III Devices Description Designs targeted to Cyclone III devices may not meet timing when the skew optimization option is turned on by default. This issue may affect variations in designs targeted to Cyclone III devices. Resolution Turn off the skew optimization option by adding the following assignment in the Quartus II settings file ( .qsf ): set_global_assignment -name ENABLE_BENEFICIAL_SKEW OPTIMIZATION OFF This issue will be fixed in a future version of the Triple-Speed Ethernet MegaCore function. Custom Fields values: ['novalue'] Troubleshooting novalue True ['Ethernet'] ['FPGA Dev Tools Quartus II Software'] novalue 10.0 ['Cyclone® III FPGAs'] ['novalue'] ['novalue'] ['novalue']