Device Family: Arria® II GX

Device Family: Arria® II GZ

Type: Answers

Type: Errata

Area: EMIF

Area: Intellectual Property


IP Product: ALTMEMPHY

Why can t I merge PLLs for two different instances of the ALTMEMPHY IP?

Description

ALTMEMPHY calibration uses PLL reconfiguration to update PLL phases. Thus, dynamic PLL reconfiguration is required.

Since each ALTMEMPHY interface must be calibrated separately and may require different adjustments to the PLL clocks, the PLLs cannot be merged. 

For further information, refer to the ALTMEMPHY sections in the 12.1 version of the External Memory Interface Handbook.

Workaround/Fix