Device Family: Arria® V GX, Arria® V GZ, Arria® V ST, Cyclone® V SE, Cyclone® V ST, Cyclone® V SX

Type: Answers, How-To

Area: EMIF, Intellectual Property


IP Product: UniPHY Controller

Warning: DQ I/O pins fed by DQS I/O pin assigned different I/O standards

Description

After run the pin_assignments.tcl and perform compilation. You will get warning as below:

Warning (181009): DQ I/O pins fed by DQS I/O pin "I/O pad mem_dqs[*]" assigned different I/O standards -- it is recommended that all DQ I/O pins fed by the same DQS I/O pin have the same I/O standard

This is due to the fact that legality checks don't understand that differential and single-ended I/O standards are actually the same.

Workaround/Fix

This warning can be safely ignored.

This issue will be fixed in a future version of the Quartus®  II software.