Description
Yes, if you enable the PLL calibration feature in the altlvds MegaWizard™ for Stratix® III devices in Quartus® II software version 9.1, the "rx_dpa_locked" signal may never go to 'high' in Modelsim gate level simulation. This is not representative of actual device behavior.
Resolution
This problem is fixed in the Quartus II software version 10.0.