Why is the "Additional CK/CK# phase" option grayed out in the parameter editor for Stratix® V and Arria® V GZ devices?

Description

The "Additional CK/CK# phase" option is grayed out in the parameter editor because custom phase shifts for the memory clock is not supported for that device and protocol.

Resolution

The Stratix® V and Arria® V GZ devices only support this option for UniPHY-based DDR2 memory controllers with a frequency of 150 MHz or above.