Device Family: Stratix® IV E, Stratix® IV GT, Stratix® IV GX

Type: Answers

Area: EMIF, Intellectual Property


IP Product: DDR3 SDRAM Controller supporting ALTMEMPHY

Can I have more than one DDR3 SDRAM (with leveling) memory interface located in a single IO sub-bank for Stratix IV device family?

Description

For UniPHY based DDR3 SDRAM (with leveling) memory interface if two DDR3 SDRAM interfaces are sharing PLL, you can have more than one DDR3 SDRAM interfaces in one sub-bank.

You can not have more than one Altmemphy based DDR3 SDRAM (with leveling) memory interface located in a single IO sub-bank for Stratix® III and Stratix IV device family.

Stratix III and Stratix IV devices have only one leveling delay chain per I/O sub-bank.  You can only have one memory interface in each I/O sub-bank (such as I/O sub-banks 1A, 1B, and 1C) when you use leveling delay chains if you are not sharing the PLL since two different clocks can not feed one leveling delay chain. Sharing of PLLs is only available in UniPHY based DDR3 SDRAM interfaces.