Article ID: 000077659 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why do I see idle time on the DQ bus when doing continuous writes while interfacing DDR2 memory using DDR2 High Performance (HP) Controller if I set my CAS latency to 5 or above in Quartus II software and IP version 8.0SP1?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

As of now, when you set the CAS latency of 5 or above in the DDR2 HP Controller Megawizard you will not be able to perform continuous burst of writes even if you are not doing any bank management in Stratix® II or Stratix III devices.

The DDR2 HP Controller IP will be fixed in the future versions for the above mentioned issue. You can download the patch for Quartus® II software and IP version 8.0SP1 for PC and Linux to get around this issue.

Related Products

This article applies to 1 products

Stratix® III FPGAs