Manual assignment of PLLCLKOUT pin for the MAX 10 device generates errors

Description

In the Quartus® II software release version 14.0 update 2, manual assignment of PLLCLKOUT pin for the MAX® 10 device generates the following errors in the Fitter:

Error (176138): Can't place differential I/O pins and/or associated SERDES transmitters or receivers -- location assignments are illegal

Error (176150): Pin "<pin name>" with LVDS I/O standard must be driven by the external clock output of an enhanced PLL

The PLLCLKOUT pin can be used as general purpose I/O pins for MAX 10 devices, but this option is currently not automatically supported by the Fitter.

Resolution

There is no workaround. This issue will be fixed in a future release of the Quartus II software.