In Arria® II GX devices, the maximum clock frequency that can be driven by the ALTLVDS_TX megafunction is 800 MHz. To avoid getting the above error in the ALTLVDS_TX MegaWizard™ Plug-In Manager for data rates above 800 Mbps, set the outclock divide factor to a value other than "1" in the Transmitter settings tab.
Article ID: 000083959 Content Type: Troubleshooting Last Reviewed: 09/11/2012
"Error: Illegal output clock frequency. Output clock frequency cannot be greater than 800 MHz for C2 speed grade"
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