Description
Due to a problem in the Intel® Quartus® Prime Standard Edition software version 18.1, you may see this internal error when compiling a design that instantiates one or more Clock Control Blocks(ALTCLKCTRL). This problem occurs when targeting Cyclone® V devices.
Resolution
To work around this error, remove the Clock Control Blocks(ALTCLKCTRL) from the design and fit the design automatically.
This problem is scheduled to be fixed ina future release of the Intel® Quartus® Prime Standard Edition software.
