You may see this internal error when compiling designs with Quartus® II software versions 10.0 SP1 and earlier. You may also see the following messageError: The lvds clock and the DPA clock frequency of SERDES receiver atom "rx_0" must be the same.
These errors are the result of an LVDS receiver with an incorrectly configured DPA clock.
To correctly use the DPA function of the LVDS receiver, in the ALTPLL megafunction associated with the LVDS receiver you should enable the Use these clock settings for the DPA clock (For the Left-Right PLL type only) option on the Output Clocks page of the ALTPLL MegaWizard™ Plug-In. This option is disabled and cannot be selected when running the Quartus II software versions 10.0 SP1 and earlier and targeting an Arria® II GX device.
A patch is available to fix this problem for the Quartus II software version 10.0 SP1. Download and install Patch 1.119 from the appropriate link below. This patch enables the option for the DPA clock setting in the ALTPLL MegaWizard.
- Download the Quartus II software version 10.0 SP1 Patch 1.119 for Windows (.exe)
- Download the Quartus II software version 10.0 SP1 Patch 1.119 for Linux (.tar)
- Download the Readme for the Quartus II software version 10.0 SP1 Patch 1.119 (.txt)
This problem is scheduled to be fixed in a future release of the Quartus II software.