Device Family: Intel® Stratix®

Type: Answers

Area: EMIF, Intellectual Property

IP Product: DDR3 SDRAM Controller supporting ALTMEMPHY

Are there any know issues with AltMemPHY IP with mutliple rank external memory systems?


Yes, when using Quartus II software version 9.1 and above there can be errors during read and writes to the external memory before or after a rank change. These are caused by certain driver patterns that result in the High Performace Controller II issuing commands at incorrect time intervals.  

This can affect all multi-rank memory designs.

To fix this issue, alt_ddrx_timing.v file in your project needs to be replaced with the attached corrected alt_ddrx_timing.v file. Be sure to do this everytime the IP is regenerated.

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