Device Family: Arria® V GZ, Stratix® IV E, Stratix® IV GT, Stratix® IV GX, Stratix® V E, Stratix® V GS, Stratix® V GT, Stratix® V GX

Type: Answers

Area: EMIF, Intellectual Property

IP Product: Renewal DDR2 SDRAM Controller MegaCore supporting UniPHY

Error: The parameter MEM_CS_WIDTH (Number of chip-selects per device/DIMM) must be set to 2 or greater for RDIMM/LRDIMM devices


You may experience the above error when the Memory Format option is set to Registered DIMM for your DDR2 UniPHY-based controller in the Quartus® II software version 12.1 and later. The error occurs when the Number of chip-select per device/DIMM option is set to 1. 


The workaround is to generate the DDR2 UniPHY-based controller with two chip-selects and ignore the second chip-select signal from the controller.

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