Description
No, transceiver Tx PLL dynamic reconfiguration for Stratix® V GX devices is not supported in Quartus® II Software Version 11.1.
The Custom PHY and Low Latency PHY MegaWizards™, allow you to select Tx PLL dynamic reconfiguration but this feature is not supported in Quartus II software version 11.1
Resolution
Please update your Quartus II software to version 11.1sp1 or later for Stratix V GX designs implementing PLL Reconfiguration.