Device Family: Cyclone® III

Type: Answers

Type: Errata

Area: Intellectual Property



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.

Workaround/Fix

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.