ID:16136 When nsleep port is connected, I/O standard <name> cannot be assigned for pin <name>. The valid I/O standards are SSTL/HSTL/HSUL and LVDS.

CAUSE: Quartus have detected incorrect I/O standard assignment to the specified pin. However, the Fitter cannot place the pin because the pin has assigned with incompatible I/O standard that could work for NSLEEP.

ACTION: Assign proper I/O standard applicable for nsleep pin usage.