Article ID: 000084755 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why do I see Memory Write CAS Latency (CWL) of 5 in my simulation when I set this parameter to be 6 in the DDR3 High Performance (HP) Controller IP Megawizard?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

If you have set up your DDR3 HP Controller IP Megawizard® "Auto-Calibration Simulation Options" in "Skip Calibration" mode, in the simulation you will see the CWL of 5 even if you have set the CWL parameter to 6 in the IP Megawizard.

The Quartus® II software and IP version 8.1 and earlier only support CWL of 5 for "Skip Calibration" mode.

Change the setting for "Auto-Calibration Simulation Options" to "Quick Calibration" or "Full Calibration" mode to get correct CWL value of 6 in the simulation.

This issue will be fixed in the future version of the IP and Quartus II software.

Related Products

This article applies to 3 products

Stratix® IV E FPGA
Stratix® IV GX FPGA
Stratix® III FPGAs

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