Due to a problem in the Quartus® II software version 15.0 and earlier, you may see this internal error if you change the JTAG pin assignment from the default value.
In MAX® 10 devices, JTAG pins are dual-purpose pins. If you use the JTAG pin as a dedicated pin, you do not need to do any pin assignment for the pin. You may get this internal error if you edit the pin assignment to anything other than the default value.
To avoid the error, perform one of the following steps:
- Revert back all JTAG pin I/O standard to the default IO standard in the pin planner.
- Change to the default I/O standard to 3.3-V LVCMOS
- Go to Assignments -> Device -> Device and Pin Options -> Voltage -> change "Default I/O standard" to 3.3-V LVCMOS