DQS Delay logic option

A logic option that increases the propagation delay from a DQS I/O pin to the interior of the device. This option is used to center-align the DQS signal to the DQ data signals and should be selected to ensure the desired setup and hold margins across process, voltage, and temperature ranges.

This option is useful for balancing the delay (skew) between the DQ I/O and DQS I/O pins on the device.

This option must be assigned to a bidirectional pin with a valid DQS frequency or it is ignored. This option is available for CycloneIII and CycloneIV devices only.