ID:181006 DQS I/O pin "<name>" connects to nDQS I/O pin "<name>", but uses the non-differential I/O standard <name>-- both pins must be assigned a differential I/O standard

CAUSE: Your design contains a DQS I/O with a complementary nDQS I/O pin. This design configuration requires that both DQS and nDQS pins be assigned the same, differential I/O standard.

ACTION: Modify the I/O standard assignments of the DQS and nDQS pins to use the same differential I/O standard .