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

Type: Answers

Area: Component, EMIF


IP Product: DDR3 SDRAM Controller supporting ALTMEMPHY

Why do I have to disable the DM pins generation in the DDR3 SDRAM High Performance Controller or Altmemphy IP Megawizard when implementing DDR3 SDRAM controller in x4 mode in Stratix III or Stratix IV devices?

Description

You have to disable the DM pins generation in the DDR3 SDRAM High Performance Controller or Altmemphy IP Megawizard when implementing DDR3 SDRAM controller in x4 mode in Stratix® III or Stratix IV devices because there are not enough pins in a x4 DQS group to include the DM pin.