Why does my project with an RLDRAM or QDR interface stall in the fitter?

Description

Due to a problem in the Quartus® II software, the compilation may never finish during the fitter stage if you let the Quartus® II software auto-place the pins. This issue is caused by the fitter placing multiple strobe pins or data mask (DM) pins from different interfaces into the same x4 DQ/DQS group when using RLDRAM II, RLDRAM III, QDR, or QDR II.

Resolution

To work around this issue, manually place the strobe pins and DM pins into different x4 DQ/DQS groups.

This issue has been fixed in the Quartus® II software version 13.0.